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16GB Micro SD Class 6 speed issues

I originally had an 8gb class 4 card and when transferring files between my Nexus and PC I noted speeds of up to around 3mb per second.
I recently invested in a 16gb class 6, but now when I transfer files I am very lucky to even reach 1mb per second. This card is incredibly slow, is this right? I thought class 6 were supposed to be at around 6mb's per second?

strange that the speed is less that the class 4 sd, but u cud confirm the card transfer speed using a card reader
but in any case, you shud note that the phone limits the transfer speeds so u mite never get the full transfer speed of a class 6 card...

Oh, I did not know that the phone would limit the speeds, still, it does seem strange that the speed is less than my class 4.
I shall do what you suggested and try and get hold of an adapter to use my card reader

dannstarr said:
I originally had an 8gb class 4 card and when transferring files between my Nexus and PC I noted speeds of up to around 3mb per second.
I recently invested in a 16gb class 6, but now when I transfer files I am very lucky to even reach 1mb per second. This card is incredibly slow, is this right? I thought class 6 were supposed to be at around 6mb's per second?
Click to expand...
Click to collapse
Where did you buy this card from. If it was off ebay, then it could be a fake & that would explain the 1mb transfer speed.

I recently bought a Kingmax 16GB Class6 microSD card. While I was initially transferring my files from my Sandisk 8GB Class2 microSD card, I noticed that the transfer rate was kind of slow, so I decided to do some benchmarking.
Software: CrystalDiskMark 3.0
3 different microSD cards using same USB card reader
Card #1 - Sandisk 8GB C2
Card #2 - Kingston 8GB C4
Card #3 - Kingmax 16GB C6 (new one that I just bought)
Here are the results (Seq Read; Seq Write; Random Read; Random Write):
Card #1: 17.08MB/s; 5.13MB/s; 17.09MB/s; 1.05MB/s
Card #2: 17.23MB/s; 9.53MB/s; 17.23MB/s; 1.92MB/s
Card #3: 16.05MB/s; 5.22MB/s; 16.73MB/s; 1.02MB/s
Summary: My new Class6 card was about the same speed as my Class2 card.
I approached the vendor and they tested a few other Kingmax card that they had in stock... all cards were reportedly about the same speed as the one they sent me. They swear that it's not fake. Maybe its a bad batch of cards but somthing is weird/wrong. Anyways... I'm sending my card back for a refund. I am going to stick to my Kingston Class4 card now.

1MB/sec can be indicative of USB 1 speeds, is OP sure that its connecting @ USB 2?
The class is supposed to be the minimum write speed, and I assume that to be sequential.

>Kingston
isn't that ring the bell? I mean they are pretty expensive....
I think if you go beyond certain level of quility, the pay off of such c/p ratio will get narrowed and you can't tell difference......
either go dirt cheap or go super HD expensive, middle is kind of "uh they are more expensive than dirt cheap but not even close to those expensive things....."
like my AMD vs INTEL war, cheapest AMD almost always beat middle/low Intel by cost + performance, or just go get best INTEL and enjoy the hell out of it.
happy new year

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

Anyone got a UHS-1 microSD card working?

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.

SD card question.

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.