Hi guys
i recently received my Sandisk Class 4 16gb micro sd card, but im getting pretty slow speeds with it.
Its currently in FAT32 format.
When transferring files from my computer to the card via the usb cable, im getting 3mbps, which is much slower than what ive seen others get with a class 2 sandisk microsd card.
Also when i test the card using 'SD tools' in the app market it says it should have write 5.7, read 10.4, which is not what im getting and still slower than results ive seen others get with class 2 sandisk microsd cards.
I also have an old 2gb Verbatim card (with no class markings), which is currently in FAT format (not FAT32), that came free with an old phone, that seems very quick when transferring files, much quicker, and in SD Tools it gets - write speed 2mbs, read speed 17 mbps.
Questions -
What format should i set the card to maximize performance (not using app2sd)?
Is a smaller capacity card of the same class faster?
(is a class 4 8gb faster than class 4 16 gb?)
Is FAT faster than FAT32?
Is my card defective?
Should i return it for a class 2 as they seem to be faster?
Hope you can help
For starters, which of those 2 file system is really faster don't matter because you cannot use FAT16 on your 16GB card. FAT16 only supports up to 2GB.
Also, class 4 is suppose to be faster than class 2.
sounds like you got a fake Sandisk Class 4 16gb, a knockoff market imitation with low quality component
what is the actual speed test result of the write?
AllGamer said:
sounds like you got a fake Sandisk Class 4 16gb, a knockoff market imitation with low quality component
what is the actual speed test result of the write?
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Thanks for the reply allgamer, I've seen many of your posts on these boards and your very helpful
My actual write speeds are 3mbps, when transferring from my pc to the phone via usb cable.
I got the card from play.com so I didn't expect it to be fake. Are there any other tests I could do to confirm its authenticity?
Should I try different file systems like ext2 or fat etc?
3MB/s for a class 2 card is pretty good. I don't what you can expect more from that.
I have an Kingston 16Gb Class 4 and the writing speed from pc -> phone is like 2MB/s, much slower then it should. But in SD Tools its shows 4 or 4.8 MB/s writing speed.
dukuletz said:
3MB/s for a class 2 card is pretty good. I don't what you can expect more from that.
I have an Kingston 16Gb Class 4 and the writing speed from pc -> phone is like 2MB/s, much slower then it should. But in SD Tools its shows 4 or 4.8 MB/s writing speed.
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The card I got is a class 4, and being a san disk I expected better write speeds.
What is really confusing is why the 2gb card (with no class markings) I got free with an old phone is much faster at transferring files via usb despite it getting a much lower score in SD tools.
Can anyone explain that?
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?
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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?
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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?
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atrix2noob said:
It doesn't list a class number would you know what number they usually are?
Sent from my MB865 using xda premium
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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?
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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.
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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.
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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
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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?
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chriselmore said:
Fyi i'm running a Patriot class 10 card in my a2 with no problems
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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.
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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 .
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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 ?
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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.
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That is not true. I have a class 6 32GB card that works perfect, and so do several others that own the atrix2.
Does class 10 really matter? I know according to sandisk its 32gb http://www.amazon.com/gp/product/B007XZM6VG/ref=ox_sc_act_title_2?ie=UTF8&smid=ATVPDKIKX0DER has a speed of 30MB/S. Reading into it on sdcard.org https://www.sdcard.org/consumers/cards/ on the bottom they say you should only get cards that the device will support the speed of. Example if you have a system that only supports SD-RAM PC100 you can put PC133 in it but it will down clock to PC100. My question is does the skyrocket support writing at class 10 UHS-1 speed?
tjsooley said:
Does class 10 really matter? I know according to sandisk its 32gb http://www.amazon.com/gp/product/B007XZM6VG/ref=ox_sc_act_title_2?ie=UTF8&smid=ATVPDKIKX0DER has a speed of 30MB/S. Reading into it on sdcard.org https://www.sdcard.org/consumers/cards/ on the bottom they say you should only get cards that the device will support the speed of. Example if you have a system that only supports SD-RAM PC100 you can put PC133 in it but it will down clock to PC100. My question is does the skyrocket support writing at class 10 UHS-1 speed?
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For reference I have a 16GB Class 6 Transcend mSD and get Write 12.5MB, Read 9.5MB (weird) with SDTools (Google Play). But not all class X cards are made alike. Depending on what you do with the card, random access and random write might be much more important bench-marking indicators (using things like APP2SD where the card is frequently accessed).
There has been discussions on people noticing true class 10 speeds on their Skyrocket regarding PC to SGS2 transfer but for internal use, 6 should suffice (a true class 6, there are a lot of knock offs). I always used the rule of thumb that class = the MB/s and anything better, well don't brag about it because the class rating by the SD association only deals with the min speed and not the max.
Will my Sensation XE support this micro SD card?
I am looking at a 64GB card with "UHS Speed Class 1" but I am not sure if my phone can handle speeds of 40mb/s and therefore if it would be worth the extra cost?
Should I just go for a Class 10?
deadfire19 said:
Will my Sensation XE support this micro SD card?
I am looking at a 64GB card with "UHS Speed Class 1" but I am not sure if my phone can handle speeds of 40mb/s and therefore if it would be worth the extra cost?
Should I just go for a Class 10?
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Click to collapse
according to sensation's specs we can use up to 32mb sdcards
but if i remember well some users have 64mb capacity of sdcard but i can't remember which class
edit:i think 64mb sdcard class 1 will be very slow
I'm using a 64 class 10 and I'm very happy with it. It depends on what you want but I as I understand it, class 10 will give you faster speeds. You can test your card once it arrives with a SD card tester app from market to insure it's running at the speeds it should be. I checked mine and was very pleased. I would try the class 10 if I we're you. Don't get a generic brand do get a reputable brand you can trust. Hope this helps.
rzr86 said:
according to sensation's specs we can use up to 32mb sdcards
but if i remember well some users have 64mb capacity of sdcard but i can't remember which class
edit:i think 64mb sdcard class 1 will be very slow
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I think your getting MB and GB mixed up.
I also think your getting Class # and UHS - 1 (Ultra High Speed Class 1) mixed up
realsis said:
I'm using a 64 class 10 and I'm very happy with it. It depends on what you want but I as I understand it, class 10 will give you faster speeds. You can test your card once it arrives with a SD card tester app from market to insure it's running at the speeds it should be. I checked mine and was very pleased. I would try the class 10 if I we're you. Don't get a generic brand do get a reputable brand you can trust. Hope this helps.
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I'm asking if it will work in the phone. I am sure it will achieve speeds on a PC because that has processing power and USB controllers for it. I dont know if any phone is fast enough to handle it though...
deadfire19 said:
I think your getting MB and GB mixed up.
I also think your getting Class # and UHS - 1 (Ultra High Speed Class 1) mixed up
I'm asking if it will work in the phone. I am sure it will achieve speeds on a PC because that has processing power and USB controllers for it. I dont know if any phone is fast enough to handle it though...
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Click to collapse
I have a Sandisk UHS 32GB and works just fine in my Sensation, and there have been reports of the 64GB working as well. though its not really worth it for a phone because they can only handle around a class 6. cameras on the other hand...
deadfire19 said:
I think your getting MB and GB mixed up.
I also think your getting Class # and UHS - 1 (Ultra High Speed Class 1) mixed up
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Click to collapse
yeah you have right about the capacity.i was meaning gb
also you have right about UHS:good: