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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...
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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

bought Kingston sdhc class 4 BUT....

Hi
I bought a Kingston 8GB SDHC Class 4 card today, I used a Class 2 before, anyway, I copied a lot of music (about 4GB) to the card from the computer but I don't even get close to 4MB/s only 1.38MB/s, have I done something wrong or is it a problem with the card?
thanks

If you're copying file to your phone over usb it will be capped at 2MB/s. It's the phone's fault, not your card. I bought a 16gb class 6 without knowing this and now I have to take my memory card out if I want to take advantage of the write speeds.

Gille1 said:
Hi
I bought a Kingston 8GB SDHC Class 4 card today, I used a Class 2 before, anyway, I copied a lot of music (about 4GB) to the card from the computer but I don't even get close to 4MB/s only 1.38MB/s, have I done something wrong or is it a problem with the card?
thanks
Click to expand...
Click to collapse
You may have been scammed. To know for sure, you should run the h2testw program against the new card. It's quite common for scammers to pass off 2GB cards as 8, 16, or even 32GBs. They can program the card to tell your PC that they are bigger than they actually are.
The h2testw script can test this by writing 8 1GB files (approximately) to your card.
Good luck!

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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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?

[Q] Using a 64GB microSD?

First thread, so putting that out in advance.
I download ALOT of music, and since I wanted to sync lots of music from spotify to my phone and bring a few movies for traveling, I bought a Samsung SDXC 64GB class 10 microSD card from amazon on bf.
I've formatted it to fat32 (with guiFormat on windows and android itself), and my atrix will reconize it. But once I start syncing music to it it unmounts it after a variable amount of time.
Has anyone else been able to get a 64GB microsd to work with their atrix?
Thanks!

i dont think it would , since specs says the phone can handle up to 32 gb micro sd card , and never readed someone report about a working 64 gb micro sd card
sent from the gray stuff inside my skull

On the bionic, they say it works.
http://forum.xda-developers.com/showthread.php?t=1458992&highlight=64gb
Aren't the bionic and atrix 2 the same?
Also, I'm running magic mod jb. I read somewhere that 4.0+ has issues with sdxc, could that be an issue?

Try formatting with a different allocation size to see if it works.
Atrix2 doesn't support NTFS or ex-fat, which some other phones do.

QuatroQuatro said:
First thread, so putting that out in advance.
I download ALOT of music, and since I wanted to sync lots of music from spotify to my phone and bring a few movies for traveling, I bought a Samsung SDXC 64GB class 10 microSD card from amazon on bf.
I've formatted it to fat32 (with guiFormat on windows and android itself), and my atrix will reconize it. But once I start syncing music to it it unmounts it after a variable amount of time.
Has anyone else been able to get a 64GB microsd to work with their atrix?
Thanks!
Click to expand...
Click to collapse
Yeah class 10 cards are known to have issues with this phone. It really has nothing to do with it being 64GB or not, that is causing it to dissapear or unmount, but the fact that it is a class 10 card. We have had way too many issues with anything higher than a class 6 card in the atrix2. It is also noted that the atrix2 really technically does not support SDcards higher than 32GB, but I have a 64GB card that I use in several of my phones that seems to work ok from time to time, but I only use it to move a file from one of my other phones to the A2 once in a while, so long term I really don't have a lot of info on that.

Ok, that makes sense. Too bad they don't sell class 6 anymore. So I should try to find a class 6 32gb card then instead of 10?

QuatroQuatro said:
Ok, that makes sense. Too bad they don't sell class 6 anymore. So I should try to find a class 6 32gb card then instead of 10?
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anything that is class 4 or class 6 is know to work with out issues, no matter the size.
I have 2 class 4 32GB cards that I bought just for this phone that were like 30 USD 6 or 10 months ago, so I am sure you can find a few really cheap now. I know that the whole class 4 or class 6 and the speed thing really tend to turn people off, but I can copy 20GB of music to one card in just over 1 - 1.5 hours, so it is not too bad.

jimbridgman said:
anything that is class 4 or class 6 is know to work with out issues, no matter the size.
I have 2 class 4 32GB cards that I bought just for this phone that were like 30 USD 6 or 10 months ago, so I am sure you can find a few really cheap now. I know that the whole class 4 or class 6 and the speed thing really tend to turn people off, but I can copy 20GB of music to one card in just over 1 - 1.5 hours, so it is not too bad.
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Thanks a lot Jim! Yeah the 32gb is like $20 on Amazon, so I'll spring for a couple of those. Your right, I guess you really don't need that speed anyway (I can wait to transfer my music).

jimbridgman said:
Yeah class 10 cards are known to have issues with this phone. It really has nothing to do with it being 64GB or not, that is causing it to dissapear or unmount, but the fact that it is a class 10 card. We have had way too many issues with anything higher than a class 6 card in the atrix2. It is also noted that the atrix2 really technically does not support SDcards higher than 32GB, but I have a 64GB card that I use in several of my phones that seems to work ok from time to time, but I only use it to move a file from one of my other phones to the A2 once in a while, so long term I really don't have a lot of info on that.
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Click to collapse
Hmm. I having no problems with a UHS-1 sd card.

QuatroQuatro said:
Ok, that makes sense. Too bad they don't sell class 6 anymore. So I should try to find a class 6 32gb card then instead of 10?
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Click to collapse
They do. I just bought a 32gb class six sandik on amazon
By the way my 32 class six is noticeably faster than my 16gb class 4...

Apps on SD card in "merged storage" lag

Hi,
I have my SD card (class 6) merged with my internal storage. Every app I move to the SD card lags like hell! They work perfect when on the internal storage. My storage is starting to fill though as it's only an 8GB device. Any ideas? I've been thinking that if I get a class 3 uhc SD card (they reckon they're up to 60 MB/s) but I'm not sure is that the problem?
Thanks for your advice.

Class 10 should be bare minimum. I am pretty sure the class 6 card is the cause. Uhs 3 is recommended.
Broadcasted from Zeta Reticuli

I would concur with @Gravemind2015 your card is too slow... Although I think a minimum UHS1 card is required to make it usable due to the higher write speed than a Class 10, but I do agree a UHS3 is recommended.
A Class 6 card is just too slow for use as adopted storage, I would convert it back to portable until you can get a new card or it will constantly lag on you.

Thank you for your help
I've bought a UHS Class 3 card, installed it and it's solved the problem.

acejavelin said:
I would concur with @Gravemind2015 your card is too slow... Although I think a minimum UHS1 card is required to make it usable due to the higher write speed than a Class 10, but I do agree a UHS3 is recommended.
A Class 6 card is just too slow for use as adopted storage, I would convert it back to portable until you can get a new card or it will constantly lag on you.
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sir can i ask? i got same problem here, now i used sandisk micro SDHC UHS-I Class 10 16GB speed up to 48mb/s. but i still got lag, that laggy was from my phone or my sd card? if it cause by sd card, and than i'll buy UHS-3 class 10 speed up to 90mb/s. it will solved my laggy? i used Moto g4 plus 2/16 run with MM 6.0.1

jincuriki said:
sir can i ask? i got same problem here, now i used sandisk micro SDHC UHS-I Class 10 16GB speed up to 48mb/s. but i still got lag, that laggy was from my phone or my sd card? if it cause by sd card, and than i'll buy UHS-3 class 10 speed up to 90mb/s. it will solved my laggy? i used Moto g4 plus 2/16 run with MM 6.0.1
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Click to collapse
The card reader in the 3rd and 4th generation G devices is UHS-1, it's write speed is limited in real world use is limited to about 45mbps, or about 1/2 to 1/3 of the embedded storage chip... You will always have some lag by comparison. Will a U3 card be better? I can't answer that definitively since it would vary based on your specific usage.