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16gb micro sdhc class 10, write speed 6mb/s?

Hello!
I bought Kingston 16gb class 10 micro sdhc card and I tested it on my nexus one getting result 6mb/s and in unbutu getting same results. Both was directly pluged (Not Usb). I closed every running application in nexus one and I got same result. I also tested in different partitions and in ext2 I was getting little slower result than in fat32. But both were same or under 6mb.
Is there something wrong with the card or is it issue with nexus one that android 2.2 doesnt support class 10?

elkyur said:
Hello!
I bought Kingston 16gb class 10 micro sdhc card and I tested it on my nexus one getting result 6mb/s and in unbutu getting same results. Both was directly pluged (Not Usb). I closed every running application in nexus one and I got same result. I also tested in different partitions and in ext2 I was getting little slower result than in fat32. But both were same or under 6mb.
Is there something wrong with the card or is it issue with nexus one that android 2.2 doesnt support class 10?
Click to expand...
Click to collapse
please include where it was purchased, how much, and if there are any serial numbers/stamps on the card. there are known fakes in circulation (even brick and mortor retailers) fyi.

http://www.verkkokauppa.com/popups/prodinfo.php?id=1244 , bought for 101 euros. Serial in the card: SDC10/16GB N0206-001.AD00lF Taiwan.
ANd on adapter reads CHINA

wow thats really slow i have a 16Gb class 4 and i get 7 ~ 8 mb write speeds when the card is in N1 and connected with usb.

I would assume it's the card because as I and someone else stated above, get higher speeds with a lower class card.
As stated here:
It's my understanding that the "Class" simply refers to speed rating and thus should not effect compatibility. As long as the card supports the microSDHC standard and isn't any larger than 32gb it should work. You should also note however that in the past, vendors have claimed a higher class rating when the card did not actual perform that fast. I suggest buying from a trusted vendor with a good name.

32GB SD Card
Anyone tested the 32GB card, I know it's only class 2....

Android Class 10, SDHC3.0 compliant ?
elkyur said:
Hello!
I bought Kingston 16gb class 10 micro sdhc card and I tested it on my nexus one getting result 6mb/s and in unbutu getting same results. Both was directly pluged (Not Usb). I closed every running application in nexus one and I got same result. I also tested in different partitions and in ext2 I was getting little slower result than in fat32. But both were same or under 6mb.
Is there something wrong with the card or is it issue with nexus one that android 2.2 doesnt support class 10?
Click to expand...
Click to collapse
Class 10 should be supported, but they are usually SDHC3.0 card which is new I think...
I have a kingston class 10 as well, same issue, read speed is good but write speed is rated as 2gb, I tried to change the sector size to 4k and still the same.
For those thinking it's a fake card it is not! when I place the card in an adaptor I do 10MB write and close to 16MB read so this is a class 10.
I am not sure if it's the SDC tester app that is wrong or the phone
but since the phone behave fairly well compared to my class 4 card it could be the application. I will do some internal transfer tomorrow to see how fast they go

me too
P00r said:
Class 10 should be supported, but they are usually SDHC3.0 card which is new I think...
I have a kingston class 10 as well, same issue, read speed is good but write speed is rated as 2gb
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Click to collapse
Same card on my HTC Desire... same results... only 2mb/s write beside 15Mb/s read

gary.lavin said:
Anyone tested the 32GB card, I know it's only class 2....
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Click to collapse
See my comparison of Sandisk 16Gb vs Kingstonm 32Gb Class 4 card :-(
http://forum.xda-developers.com/showthread.php?t=830087
I just saw your thread in this forum after I posted mine in the other
Sorry
G.

Micro SD - slow speeds, help!!

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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Click to collapse
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.
Click to expand...
Click to collapse
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?

MicroSD Cards

Hello XDA.
I have some questions about MicroSD cards in our phone. First of all, what is the maximum space it can handle? 32gb? And, what is the difference between class 4, 6, 10, etc. I know it has something to do with writing speed. But what is the maximum writing speed our phone can do? So i mean, the maximum class sdcard it can handle.
Thanks in advance.

Hi,
Yes 32gb is the max space this phone can handle.As far as i know classes are the write speed to the max of which data can be written on memory card.My friend uses class 10 mem card n i seen the data transfer of 9.8mbps on his phone,so surely it can write atleast at 9.8 mbps.i had used 32 gb card class 4 it was taking a bit long to load.right now i am using class 6 16gb sandisc its working great.

[Q] What is the impact of SDHC class 4 vs. class 10 on a Galaxy S 4G?

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

SD card upgrade

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
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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
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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
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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
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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.
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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
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
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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.
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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.