Hi, i bought some days ago an 8GB class 10 micro sd card, hoping it would speed up my phone (i was using app2sd+ with Kyrillo's ROM v7.1).
I didn't notice any diference compared to my old 4GB class 2 card, so i installed SD Tools app to test the speeds, and i realized all the cards i put in my phone get 4MB/s as the maximun write speed, i tried many different sd cards, class 2 and 10 and there's no difference. Then i tried the same cards in my girlfriend's Galaxy Ace and the speeds were much higher, 7~12 MB/s write speed.
I thought it was a rom problem, so i backed up with Titanium Backup and flashed a stock ROM (JPM), but the speeds remain the same (around 4 MB/s for writing), i also tried changing the buffer size from 128kb to 1024, 2048, 4096 with "SD Booster" and "SD Speed Increase" apps, but no good results...
Could my phone be faulty?
Is there any configuration i can try to make my sd card faster? any command line?
What are the speeds you reach with "SD Tools" and classes of your SD card?
Best Regards!
I'm not sure, but I think there's nothing you can do....
Mine is a 16GB class 6 and it's the same, whatever I try. Before had 8GB - was the same.
Whatever I wrote into the 'read ahead buffer'...
But maybe anyone else has an idea?
Try changing the buffer to 0 as sometimes that works.
Sent from my GT-I5800 using XDA App
dilzo said:
Try changing the buffer to 0 as sometimes that works.
Click to expand...
Click to collapse
TNX for the tip, but unfortunately SAME RESULT...
i also get the same speeds..
i think thats a bug with sd tools.
By the way has any one tried data2sd/apps2sd v3? do you face lags?
also do you people have SD or SDHC
I belive that sdtools has a bug. Or is seriously faulty. I have 16GB class 2 sdcard and sdtools claims that my read and write speeds are equivavlent to class 6 card (values range from 6.x/6.x to 8.x/7.x, write/read, respectively (depending on read_ahead_kb values). And I know for a fact that this really cheap sdcard does not have such performance. You can try antutu benchmark, free app on market, which provides a bit more accurate results plus you can select what to benchmark. My card gets 3.0MB/s read and 2.0 MB/s write with default buffer values. Which is more accurate than sdtools. Especially because disks (any kind) usually have higher read rate than write rate (because it is easier to read data than to write it and 'cause we usually perform much more reading than writing, so it is optimized for read operations).
mrvek said:
I belive that sdtools has a bug. Or is seriously faulty. I have 16GB class 2 sdcard and sdtools claims that my read and write speeds are equivavlent to class 6 card (values range from 6.x/6.x to 8.x/7.x, write/read, respectively (depending on read_ahead_kb values). And I know for a fact that this really cheap sdcard does not have such performance. You can try antutu benchmark, free app on market, which provides a bit more accurate results plus you can select what to benchmark. My card gets 3.0MB/s read and 2.0 MB/s write with default buffer values. Which is more accurate than sdtools. Especially because disks (any kind) usually have higher read rate than write rate (because it is easier to read data than to write it and 'cause we usually perform much more reading than writing, so it is optimized for read operations).
Click to expand...
Click to collapse
antutu give me 3.x and 4.x for write and read speed respectively!!
8gb class 10
That is odd. Do you have a card reader? Maybe you can bench from pc and see the results. I have only 2 sdcards, both class 2 and the results I get are to be expected from class 2 cards. There is also possibility that it is a low quality component. If you feel like it try to investigate, get cards info like serial, model and manufacturer and see what you'll discover. Nowadays people are selling everything claiming it to be a better than actually is. I remember reading tests regarding SD 's where they said that same card type from same manufacturer performed about 10 times worse just because one was.made in China and the other in taiwan, or something like that. I personally would do some research but it's up to you.
mrvek said:
That is odd. Do you have a card reader? Maybe you can bench from pc and see the results. I have only 2 sdcards, both class 2 and the results I get are to be expected from class 2 cards. There is also possibility that it is a low quality component. If you feel like it try to investigate, get cards info like serial, model and manufacturer and see what you'll discover. Nowadays people are selling everything claiming it to be a better than actually is. I remember reading tests regarding SD 's where they said that same card type from same manufacturer performed about 10 times worse just because one was.made in China and the other in taiwan, or something like that. I personally would do some research but it's up to you.
Click to expand...
Click to collapse
well i did a bench mark from laptop's card reader.. it was way over 18 mbps.. cancelled the benchmark in the process as it was taking too long.. but half way read speed was definitely above 18mbps.. Also my sdhc's manufacturer is transcend. I hope this company wont betray us!!
well, in that case it might have to do with phone configuration/programming. Maybe devs could figure out why the phone does not utilize full potential of the sdcard. Perhaps low ram, (relatively) "slow" cpu, something...
mrvek said:
well, in that case it might have to do with phone configuration/programming. Maybe devs could figure out why the phone does not utilize full potential of the sdcard. Perhaps low ram, (relatively) "slow" cpu, something...
Click to expand...
Click to collapse
Good point. Hope some dev is listening!!
I have the same problem.
Samsung Galaxy 3 GT-i5800, Android Froyo firmware v2.2 build XWJPL.
I tested with two class 10 microSD cards, quality ones, but got poor transfer rates.
card1: Transcend 8GB MicroSDHC Class10 (TS8GUSDHC10) - up to 20 Mb/s
card2: Samsung 8GB SDHC Plus Class10 (MB-MP8GA/EU) - Read max. 24 Mb/s, Write max 21 Mb/s
Samsung 8GB cl10 test result (SD Tools app): Write: 4.4 Mb/s; Read 5.1 Mb/s
The card write speed should be higher than 10 Mb/s
Related
Regarding SDHC classes, I've referenced the article at wikipedia about SDHC... and I understand that Class x indicates that the card supports "a sustained write speed of x MB/s" ...
So, my question is a two-parter...
1) Are there OS processes which would benefit from a Class 10 (vs. a Class 4, for example) in such a way that I would notice the "enhancement?"
2) Which applications would respond in a way that I would notice the enhancement? (I suspect that video-recording might be such an application...)
I would appreciate intelligent responses.
I have done some research on this as I am soon going to be upgrading my sd card and everything I have found suggests that for overall performance of the phone there wont be any difference between a class 4 and a class 10 other than the speed that you transfer files between your PC and your phone. Most tests I've seen usually shows double the transfer rate. And from what I understand the compression ratio is good enough on our phone's camera that it probably wont fill up the buffer with a class 4 card.
I think maybe FB will have an answer _ I recall he told me something about it
Hey guys just need a little help here im looking to buy a Dane elec either 8 or 16 gig sd card for my atrix 2 after trading in my itouch 4gen 32 gig at GameStop and getting the new nexus 7 tablet and will have about $25 left over to buy a SD card from them, will either of these SD cards cause problems with my ATRIX 2?
Sent from my MB865 using xda premium
atrix2noob said:
Hey guys just need a little help here im looking to buy a Dane elec either 8 or 16 gig sd card for my atrix 2 after trading in my itouch 4gen 32 gig at GameStop and getting the new nexus 7 tablet and will have about $25 left over to buy a SD card from them, will either of these SD cards cause problems with my ATRIX 2?
Sent from my MB865 using xda premium
Click to expand...
Click to collapse
Not as long as it is a class 6 or lower SDcard. If it is a class 6 or a class 4 you will be golden.
It doesn't list a class number would you know what number they usually are?
Sent from my MB865 using xda premium
atrix2noob said:
It doesn't list a class number would you know what number they usually are?
Sent from my MB865 using xda premium
Click to expand...
Click to collapse
Nope, because they can be from a class 2 to a class 10, and they come in all sizes and classes.... the higher the class the faster the SDcard.
You might have to do some research on the vendors website, to find out what class that card is. Again just make sure it is a class 6 or lower.
atrix2noob said:
It doesn't list a class number would you know what number they usually are?
Sent from my MB865 using xda premium
Click to expand...
Click to collapse
Rule of thumb is if it doesn't say then its class 2.anything higher and it should have a circle on the card with a 4, 6, 10 etc in it.
Motorola lied and I'm still locked mb865
mtnlion said:
Rule of thumb is if it doesn't say then its class 2.anything higher and it should have a circle on the card with a 4, 6, 10 etc in it.
Motorola lied and I'm still locked mb865
Click to expand...
Click to collapse
I have a 16GB class 4 that does not list the class on the card itself, but on the package and on the sandisk website it lists the model that I have as a class 4.
Just putting this info out there for anyone. I bought a 32gb class 4 SanDisk and it works flawlessly with this phone. I was skeptical at first because of the size but I've been using it for two weeks now without any problems.
Sent from my MB865 using xda premium
Just for the record, the class rating is the write speed which is more relevant because you'll want to add content to the card; reads speeds on SD cards are typically - and I say "typically" because in testing over 200 different sizes and brands one time (took a full day to do it) the typical read speed was about the same across them all on average - about 17.5MB/s (that's Megabytes per second read speed).
The write speed is what drags things down when it comes to adding content to SD cards, so... the higher the write speed, the faster the card should be able to store the content you're feeding it.
Class speed = approximate sustained write speed so...
Class 2 = 2MB/s on average sustained
Class 4 = 4MB/s
Class 6, etc up to Class 10 at 10MB/s.
Now, sustained means you have a big file like a movie file, perhaps a few hundred megabytes in size - transferring that one big file is the most efficient use of the card's write ability and will usually give you the actual class/write speed.
It's when you're transferring a lot of smaller random files that you'll notice you're taking a speed hit. Case in point:
You have a 100MB file and you transfer it to a Class 4 SD card, it'll most likely take between 25 (best possible throughput to 35 seconds on average (4 to 4.5MB/s max sustained write throughput).
Contrast that with say 12 mp3 files that total about 100MB, each file slightly different from maybe 5.5 to 10.5MB in size. Now, doing that transfer will take far longer than even the 35 seconds on the same exact Class 4 card because it requires more time to do the random writes when each file "breaks" the throughput going to the card. You're probably looking at 45 seconds or more for roughly the same amount of data but broken into smaller "random" chunks, and the speed hit gets even worse as the size of the files you're copying decreases.
If you start transferring a ton of image files like JPEGs to an SD card, about 100MB of them, oh boy... go make a cup of coffee or have lunch or something.
That's what Class speed means - it's only relevant to the sustained write speed on the card, aka how fast you can put content on it.
Hope this helps...
jimbridgman said:
I have a 16GB class 4 that does not list the class on the card itself, but on the package and on the sandisk website it lists the model that I have as a class 4.
Click to expand...
Click to collapse
Really? Never saw an unmarked one that wasnt a 2. I stand corrected.
Motorola lied and I'm still locked mb865
Fyi i'm running a Patriot class 10 card in my a2 with no problems
chriselmore said:
Fyi i'm running a Patriot class 10 card in my a2 with no problems
Click to expand...
Click to collapse
You WILL have issues so be prepared, and by all means do NOT run apps off SDcard or you WILL have issues and lose data!
Also anyone find out how to move apps on the SD to the internal space?
Sent from my MB865 using xda premium
chriselmore said:
Fyi i'm running a Patriot class 10 card in my a2 with no problems
Click to expand...
Click to collapse
Ditto. No issues yet.
In addition to not moving applications to the SDHC it might be a good idea to follow Patriot's advice regarding formatting. The suggestion was posted by Patriot in response to a review of a 32GB class 10 microSDHC.
Patriot acknowledged a problem with hemorrhoid OS and 32GB class 10 cards and suggested a temporary fix of performing a full format on a Windows PC with a 32kb allocation size, obviously FAT32 since stock hemorrhoid does not recognize NFTS.
The reply can be found in this review although the specific page will change if more reviews are added.
Thanks! I guess hemorrhoid OS is a real pain in the a** to work with.
Thanks! Its been a bad month so far. I really needed that laugh.
Motorola lied and I'm still locked mb865
Atrix 2 has been facing trouble when used a sd card of above class 6. I've a 32 gb class 10 card but i faced many problem when i used it last month then i had to replace it with 16gb class6 of kingston.
Sent from my MB865 using xda app-developers app
random or sequential ??
br0adband said:
Just for the record, the class rating is the write speed which is more relevant because you'll want to add content to the card; reads speeds on SD cards are typically - and I say "typically" because in testing over 200 different sizes and brands one time (took a full day to do it) the typical read speed was about the same across them all on average - about 17.5MB/s (that's Megabytes per second read speed).
The write speed is what drags things down when it comes to adding content to SD cards, so... the higher the write speed, the faster the card should be able to store the content you're feeding it.
Class speed = approximate sustained write speed so...
Class 2 = 2MB/s on average sustained
Class 4 = 4MB/s
Class 6, etc up to Class 10 at 10MB/s.
etc etc etc .
Click to expand...
Click to collapse
Have googled a lot on this and stuck on one thing now....
Class 2 cards are poor in sequential write but they are good in random writes while Class 10 cards are good in sequential writes but poor in random writes. The lower the class the better is the random write and poor is the sequential write; vice versa.
So what is more important to have an optimum speed on cell, random writes or sequential ??
I guess random it is. cause sequential writes are more often in large file writing.
Can someone put some light on this ? for applications and other little writing tasks class 2 will be good whereas for copying data from or to PC or shooting full HD videos I guess class10 would be good !!
However m not sure about Android memory usage. What is more important from OS point of view, Random or Sequential write ?
lparihar9 said:
Have googled a lot on this and stuck on one thing now....
Class 2 cards are poor in sequential write but they are good in random writes while Class 10 cards are good in sequential writes but poor in random writes. The lower the class the better is the random write and poor is the sequential write; vice versa.
So what is more important to have an optimum speed on cell, random writes or sequential ??
I guess random it is. cause sequential writes are more often in large file writing.
Can someone put some light on this ? for applications and other little writing tasks class 2 will be good whereas for copying data from or to PC or shooting full HD videos I guess class10 would be good !!
However m not sure about Android memory usage. What is more important from OS point of view, Random or Sequential write ?
Click to expand...
Click to collapse
You CANNOT run a class 10 card well in this phone. I recommend getting a class 6 card, or a class 4 card, and be done with it. Those are 100% known to work with the atrix 2 without issues. Don't worry too much about which is better for what, with this phone the class 4 and class 6 seem to work the best, and give decent performance. And yes it will take a long time to copy 16GB of music and movies to your SDcard from a computer as the writes for a class 4 or 6 are mediocre for that, but decnet when used for anything on the phone itself. Just be very careful about running apps on the SDcard with this phone, it can be touchy and lose the apps and data on reboot, even though it is still on the SDcard the phone will not know how to use them and the pointers to the android system may just be gone. Sometimes just reinstalling the app from he play store works and other times you have to format the card... that is the biggest issue with this phone, period.
Atrix 2 can only withstand Class 4.
Darell3 said:
Atrix 2 can only withstand Class 4.
Click to expand...
Click to collapse
That is not true. I have a class 6 32GB card that works perfect, and so do several others that own the atrix2.
I've been at it back and forth with Asus and SanDisk support now as I have yet to get my SanDisk Mobile Ultra 32GB UHS-1 card to work properly in the TF700T.
First card worked erratically and died completely, second card doesn't work at all.
The log of the tablet sais read errors but the card work perfectly in both PC and android mobile (x10 Mini).
Tablet sais it's DDR so I assume it uses DDR50 mode which is the most complicated mode to use due to the data timing.
Has anybody else got a UHS-1 card and had it work reliably in the TF700T ?
When mine was working I was getting sporadic read errors causing copy file from card to device to fail, and video to stutter.
(File copy was aborted by "paste files failed" message.)
These cards would offer much improved io performance vs a normal card and their improved latency should make em improve responsetime too.
I popped by a shop today and tested the UHS-1 card in a TF300 too. It got a hissyfit and went into a mount-loop.
Bought a SanDisk FCS-HS3 UHS-1 compatible USB3.0 reader to test the card on a pc and it performs great. (Well writes are within class 10 spec, and reads are fantastic.) See attached Atto run.
Also got a 32 GB Class 10 Lexar card to see how the TF700 likes it. No problems and everything seems smooth.
I have Sandisk Ultra Micro SD SDHC UHS-I 16GB Class 10 30MB/s and it's been working fine so far, it even rescued me when I needed a firmware update after bootloop, only with lower write speeds than SD, USB disk or internal memory (somehow I get somewhere near ~10/20 W/R on internal and ~20/10 on SD, pendrive, USB HDD etc., btw, seems a bit strange to me, as I would expect it the other way around).
d14b0ll0s said:
I have Sandisk Ultra Micro SD SDHC UHS-I 16GB Class 10 30MB/s and it's been working fine so far, it even rescued me when I needed a firmware update after bootloop, only with lower write speeds than SD, USB disk or internal memory (somehow I get somewhere near ~10/20 W/R on internal and ~20/10 on SD, pendrive, USB HDD etc., btw, seems a bit strange to me, as I would expect it the other way around).
Click to expand...
Click to collapse
That sounds like how my first card performed. Not fast.
I wish the SD test apps could show a graph like HD Tune on pc. To see how smoothly the card operates.
I know that any errors are masked by android and it resets card and continues thus making a card that hang all the time just appear slow.
tha_kreature said:
That sounds like how my first card performed. Not fast.
I wish the SD test apps could show a graph like HD Tune on pc. To see how smoothly the card operates.
I know that any errors are masked by android and it resets card and continues thus making a card that hang all the time just appear slow.
Click to expand...
Click to collapse
It is not about UHS-1 though, I get the same with USB pendrive or HDD.
This is the same test on the same card in a NON UHS-1 reader.
As you can see the readings are drastically different.
tha_kreature said:
This is the same test on the same card in a NON UHS-1 reader.
As you can see the readings are drastically different.
Click to expand...
Click to collapse
Sorry if I'm missing something, but on your screenshot I see 19 MB/s read and 9,5 MB/s write on average on your PC, so how is that different from what we were discussing as the speeds we were getting on the tablet?
Edit: I see your earlier post showing 40+ MB/s read speeds, but this was USB 3.0, wasn't it.
Edit: I forgot we were discussing microSD speeds. If you get 19/10 on your PC, this is in fact 50% more than I'm getting with microSD on the Infinity. It surely shows a major difference.
d14b0ll0s said:
Sorry if I'm missing something, but on your screenshot I see 19 MB/s read and 9,5 MB/s write on average on your PC, so how is that different from what we were discussing as the speeds we were getting on the tablet?
Edit: I see your earlier post showing 40+ MB/s read speeds, but this was USB 3.0, wasn't it.
Click to expand...
Click to collapse
Yes, USB3.0 with a reader using UHS-1. The UHS-1 is the most important part as that increases the bandwidth between controller and card and also reduces some delays on completion etc.
On the tablet I was getting good speeds and then pauses/breaks getting the average very low on old card. Log showed errors. New card doesn't even mount.
Edit:
It does however show how the tablet is trying to moungt it and what speed it talks to it, also what capability it has.
Edit2:
USB 2.0 can do 40 MB/s too btw, but usually max 30-35. The UHS-1 makes the difference.
For bigger data transfers I'm actually relying more on full-size SD card in the dock or USB disk. Which is of course a possibility only if one is carrying a dock..
---------- Post added at 05:56 PM ---------- Previous post was at 05:54 PM ----------
Yes, there is no question we have the lags to blame. My microSD writing speeds start with 30-35 MB/s for a few seconds (which is a lot more than I'm getting on my laptop with this card), then the lags make it drop even to 6 MB/s. So these are all the I/O issues we were discussing in so many threads here. Not much will come out of further benchmarks until we get an update (JB / kernel / smaller firmware fixes / hopefully anything)
d14b0ll0s said:
For bigger data transfers I'm actually relying more on full-size SD card in the dock or USB disk. Which is of course a possibility only if one is carrying a dock..
Click to expand...
Click to collapse
Untill the 17'th I won't have access to any docs...
Attached is a shot of the dmesg output from where it detects the card.
Notice it registers it as a ultra high speed DDR SDHC. DDR must mean it is considering using the UHS mode DDR50 which is a complicated mode requiring calibration. It also seems to assume/try NTFS first.
I can't see any attempts of uing card in normal SDHC mode after the UHS failing, nor any normal non DDR UHS modes.
d14b0ll0s said:
For bigger data transfers I'm actually relying more on full-size SD card in the dock or USB disk. Which is of course a possibility only if one is carrying a dock..
---------- Post added at 05:56 PM ---------- Previous post was at 05:54 PM ----------
Yes, there is no question we have the lags to blame. My microSD writing speeds start with 30-35 MB/s for a few seconds (which is a lot more than I'm getting on my laptop with this card), then the lags make it drop even to 6 MB/s. So these are all the I/O issues we were discussing in so many threads here. Not much will come out of further benchmarks until we get an update (JB / kernel / smaller firmware fixes / hopefully anything)
Click to expand...
Click to collapse
I'd like you to scour your dmesg log after one of those glitches, and also after inserting the card to see if there is any significant difference.
My card dipped in speed but usually did not log errors. I think the first retry is not logged if successfull.
tha_kreature said:
I'd like you to scour your dmesg log after one of those glitches, and also after inserting the card to see if there is any significant difference.
My card dipped in speed but usually did not log errors. I think the first retry is not logged if successfull.
Click to expand...
Click to collapse
I don't get any errors after (re)inserting the card apart from those from tntfs saying the boot sector is invalid, so it's quitting after finding out this is not NTFS (because it is FAT32 ;>).
Tell me what errors do you get specifically, so I could grep my logs looking for them.
d14b0ll0s said:
I don't get any errors after (re)inserting the card apart from those from tntfs saying the boot sector is invalid, so it's quitting after finding out this is not NTFS (because it is FAT32 ;>).
Tell me what errors do you get specifically, so I could grep my logs looking for them.
Click to expand...
Click to collapse
See my attached pic.
See how it identifys card ans ultra high speed ddr.
tha_kreature said:
See my attached pic.
See how it identifys card ans ultra high speed ddr.
Click to expand...
Click to collapse
Sorry, I missed the last post on the previous page.
Doesn't look good, I don't get any of these in my logs apart from the NTFS assumption, which might be the normal thing (a late attempt to solve the NTFS compatibility issues).
I would try sio if I were you.
Mine doesn't say anything about ultra speed DDR SDHC however, it only gives the "new high speed SDHC card" output..
I'm not sure what you mean by saying that it doesn't treat it as SDHC afterwards - where would you want to have it reported?
d14b0ll0s said:
Sorry, I missed the last post on the previous page.
Doesn't look good, I don't get any of these in my logs apart from the NTFS assumption, which might be the normal thing (a late attempt to solve the NTFS compatibility issues).
I would try sio if I were you.
Mine doesn't say anything about ultra speed DDR SDHC however, it only gives the "new high speed SDHC card" output..
I'm not sure what you mean by saying that it doesn't treat it as SDHC afterwards - where would you want to have it reported?
Click to expand...
Click to collapse
Your card works as it does not infact support UHS-1. It's probably one of the "Ultra" cards not "Ultra UHS-1".
The difference is a small U on the card with a 1 in it. (See attached.)
Sandisk has the same card in identical packaging, except for the UHS-1 support. The difference is drastic on PC, and apparantly catastrophic on TF700T and TF300.
See my logs attached.
Sent from my ASUS Transformer Pad TF700T using xda app-developers app
tha_kreature said:
Your card works as it does not infact support UHS-1. It's probably one of the "Ultra" cards not "Ultra UHS-1".
The difference is a small U on the card with a 1 in it. (See attached.)
Sandisk has the same card in identical packaging, except for the UHS-1 support. The difference is drastic on PC, and apparantly catastrophic on TF700T and TF300.
Click to expand...
Click to collapse
In fact, mine is not UHS-I, but regular SDHC, sorry about misinforming you, I was initially thinking about getting the one you got yourself and then misclicked on the auction, LOL, I can see it now, bummer! I think it's even class 4, not class 10 (how much slower can it be because of it?). My full-size SD in the dock is UHS-1 and it's been performing well (Sandisk Extreme 32 GB 45 MB/s class 10).
d14b0ll0s said:
See my logs attached.
Sent from my ASUS Transformer Pad TF700T using xda app-developers app
Click to expand...
Click to collapse
Thanks. Definately a non UHS card.
So far I've found or read about Sandisk Ultra in these flavour:
- Sandisk Ultra XXGB Class 6
- Sandisk Ultra XXGB Class 10
- Sandisk Ultra XXGB Class 10 UHS-1
- Sandisk Mobile Ultra XXGB Class 6
- Sandisk Mobile Ultra XXGB Class 10
- Sandisk Mobile Ultra XXGB Class 10 UHS-1
The packaging on my card sais SanDisk Mobile Ultra but the card sais only SanDisk Ultra. (First card said Mobile Ultra.)
It's really odd how there is always differences on pics I find.
tha_kreature said:
Thanks. Definately a non UHS card.
So far I've found or read about Sandisk Ultra in these flavour:
- Sandisk Ultra XXGB Class 6
- Sandisk Ultra XXGB Class 10
- Sandisk Ultra XXGB Class 10 UHS-1
- Sandisk Mobile Ultra XXGB Class 6
- Sandisk Mobile Ultra XXGB Class 10
- Sandisk Mobile Ultra XXGB Class 10 UHS-1
The packaging on my card sais SanDisk Mobile Ultra but the card sais only SanDisk Ultra. (First card said Mobile Ultra.)
It's really odd how there is always differences on pics I find.
Click to expand...
Click to collapse
Yeah, mine is not ultra, terrible miss-click. I will use it in the phone probably and will order UHS-I class 10, unless others report same problems as yours.
d14b0ll0s said:
In fact, mine is not UHS-I, but regular SDHC, sorry about misinforming you, I was initially thinking about getting the one you got yourself and then misclicked on the auction, LOL, I can see it now, bummer! I think it's even class 4, not class 10 (how much slower can it be because of it?). My full-size SD in the dock is UHS-1 and it's been performing well (Sandisk Extreme 32 GB 45 MB/s class 10).
Click to expand...
Click to collapse
Could you insert it and check the log?
See if it does anything different on it vs the other?
Unless it has any U on it it will probably only do standard SD speed of 50 MHz givingv 25 MB/s max datarate.
Hey guys,
was wondering what you all think about 16GB as internal space being enough or not? The problem that I'm thinking of is that "/sdcard" will get mapped to the internal memory (and not the external SD Card), and a lot of apps just go there to write stuff. Things like downloads folder etc., which default to /sdcard/download and may fill up the 16GB partition very soon.
What are your experiences in this direction?
thanks
Personaly for me its far too litle ,cuz i have got a lot of differents app ,also 4K video and timeshift video eat unimaginable amount of space
I believe Lollipop will allow you to save app data to an external storage.
Well there's at least a decent amount of onboard memory. I got by with a 32gb card for the past 3 years. Just noe upgraded to 64gb heading into my Z3v. I really only use it for old pics (from phone to phone) and keeping my entire music library on me at all times, which is like 12 gbs.
It's nice to know I'll never be worrying for space.
abhinav.tella said:
I believe Lollipop will allow you to save app data to an external storage.
Click to expand...
Click to collapse
Even then, the difference of write/read speeds is massive between internal memory vs external SD card. I believe 32 GB should be the bare minimum for today's smartphones. Glad T Mobile thought so as well, at least for the Z3.
Artood2s said:
Even then, the difference of write/read speeds is massive between internal memory vs external SD card. I believe 32 GB should be the bare minimum for today's smartphones. Glad T Mobile thought so as well, at least for the Z3.
Click to expand...
Click to collapse
If you get a good card like the Samsung Pro or SandDisk Extreme you won't notice much difference (40-50 MB/s Writes). The internal flash (made by Samsung) is obviously faster due being soldered and more inter connects (like RAID).
Cheap cards like the Sandisk Ultra are slow.... (10-15MB/s Writes)
abhinav.tella said:
If you get a good card like the Samsung Pro or SandDisk Extreme you won't notice much difference (40-50 MB/s Writes). The internal flash (made by Samsung) is obviously faster due being soldered and more inter connects (like RAID).
Cheap cards like the Sandisk Ultra are slow.... (10-15MB/s Writes)
Click to expand...
Click to collapse
The internal memory is like 200+ MB/s, so there is still a BIG difference. Also, I don't believe the memory controller can read the full potential of the Pro and Extreme cards. I have a 64 GB Ultra (advertised at 48 MB/s read), and I only get about 39 MB/s read. I have read the same for the Note 4 in that it cannot use the full speed available from those cards.
Artood2s said:
The internal memory is like 200+ MB/s, so there is still a BIG difference. Also, I don't believe the memory controller can read the full potential of the Pro and Extreme cards. I have a 64 GB Ultra (advertised at 48 MB/s read), and I only get about 39 MB/s read. I have read the same for the Note 4 in that it cannot use the full speed available from those cards.
Click to expand...
Click to collapse
True on both points, the card controller max is like 40-50MB/s. What I meant was I don't think you will notice much difference because, for most apps it should be fast enough and caching is still generally in the internal card. Loading big games like Asphalt may load a little slower but in use, it should not be too bad. Internal is ~240/40(R/W) Max for the klmag2geac-b001 (16GB) and 240/60 (R/W) for the 32 GB version in the D6616.
The reads are not the problem as most ops are reads anyway, but its the writes which are really low ~15 MB/s max, hence the cost of the Extreme/PRO 35-40 MB/s.
Basically what I am saying is you are right but this is your best bet.
Here is the specifications for the internal NAND if you are interested:
hi all,
i got my A9 2 days ago and have a fault with it rebooting randomly and will be getting it replaced,,
but my question is about the SD card aspect..
i fitted a Lexar 64GB Class 10 High Speed Micro SDXC Memory Card and after formating as internal and migrating the data i had a system message saying that the card was slow and suggested using a card class 3 or better.
is this normal? have not noticed any performance issues since doing so.. just curious to see if anyone else has had similar messages after putting in the SD card.
I might be off base here, but is it possible that the card itself is a fake? Have you run a speed test on it?
jellmoo said:
I might be off base here, but is it possible that the card itself is a fake? Have you run a speed test on it?
Click to expand...
Click to collapse
have run a couple of tests but not sure what speeds i should be getting for this card..
cant post a screen shot yet as im a new user..
the results from an extended accurate test
are
1.52 GHz
read 38.6Mb/s
write 38.6Mb/s
when running one of the tests it did say that its cached the data as either there was too much free space or the SD card is slow.
Honestly, that's a little weird. The results seem a little low for a high end new card which should have speeds of 80Mb/s and up, but also too high for a fake which is usually lower than 10Mb/s.
Since you're getting the device replaced anyway, it might be a good idea to re-check once you have the new unit just to make sure it isn't some bizarre issue with that specific handset.
To compare, I've currently paired my A9 with a 32GB Samsung Pro card, and haven't seen such a warning message.
Download A1 SD Bench from the PlayStore.
Tikerz said:
Download A1 SD Bench from the PlayStore.
Click to expand...
Click to collapse
the results are from that app.
jellmoo said:
Honestly, that's a little weird. The results seem a little low for a high end new card which should have speeds of 80Mb/s and up, but also too high for a fake which is usually lower than 10Mb/s.
Since you're getting the device replaced anyway, it might be a good idea to re-check once you have the new unit just to make sure it isn't some bizarre issue with that specific handset.
To compare, I've currently paired my A9 with a 32GB Samsung Pro card, and haven't seen such a warning message.
Click to expand...
Click to collapse
what speeds are you getting?
I have a SanDisk 128GB class 10 and I get 43.70MB/s read and 12.45MB/s write using A1 SD Bench.