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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

[Q] 64 GB MicroSD problems?

Hello,
TL;DR: I know how to format memory cards. The problem is; how do I get the Galaxy S2 to properly mount and access a 64 GB FAT32 MicroSD?
Long story:
I recently bought two brand new SanDisk 64 GB Mobile Ultra SDXC UHS-I Class 10 MicroSD cards (not on the internet, but from a reputable electronics retailer), in hopes of expanding the memory of my Samsung Galaxy S2 and Asus Slider SL101. I know that the Galaxy S2 does not officially support 64GB MicroSD cards, but after reading a few posts about successfully getting them to work after formatting them to FAT32, I gave it a shot.
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Initially, both cards appeared to work fine. I plugged them both into my PC, and both cards mounted fine and appeared in the Explorer window as expected. And given that these particular 64 GB cards are designed specifically for use with an Android Smartphone, I put one of them (let's call this Card A - Card B hasn't been touched yet) into my Galaxy S2.
(Note: My Galaxy S2 was running Resurrection Remix 3.1.2 when I did this)
The phone booted up as usual, and I saw the "Preparing SD Card..." text up in the status bar appear, but then it disappeared quicker than it should have. I opened up 6 file managers (ASTRO, OI, CM, Root Explorer, AndroZip and ES File Explorer) and tried to access the extSD directory, but it always shows up as empty; not even a LOST.DIR existed. Nothing could be copied to the extSD directory.
Then I plugged Card A into my PC, and checked the filesystem. It turns out that the card is formatted to exFAT by default. This isn't what I expected, because:
1. exFAT is a licensed proprietary filesystem, not supported by Android due to licensing
2. Only Samsung's newer devices (i.e. Galaxy S3, Note 2, Note 10.1) have partial unofficial exFAT support hacked into their stock TouchWiz ROM
3. Samsung's newer TouchWiz devices do not constitute for all "Android Smartphones", as SanDisk should know
So then I tried to copy a few videos to Card A. But only one video could be copied, then the card would unmount itself. Physically reconnecting it mounts it again, and performing no operations to it will leave it mounted. But as soon as I try to copy again or run a CHKDSK, it would unmount.
I opened up EASEUS Partition Manager and saw that Card A had two partitions - a large ~59.46 GB partition, and the dreaded unallocated 16 MB known to plague SanDisk's 64 GB MicroSDs. I formatted the large partition to FAT32 with a 8192kb cluster size, and the same aforementioned problem still occurs. I sent this card back for replacement, and am still awaiting news on it.
Card B is quite interesting. I plugged it into my computer, everything seems fine, so then I try it on my Asus Slider. Surprisingly, because it is an exFAT volume, the Slider detects it perfectly fine - correct capacity, LOST.DIR exists and I can perform file operations on it. I copied 30 GB of files onto it with no problems. The problems arise when I format it to FAT32.
(Note: My Asus Slider is running stock rooted 4.0.3 and it can natively read FAT32, exFAT and even NTFS. The single USB port it has can also operate a 2.5" NTFS external hard drive running off USB power.)
Card B also has the mysterious 16 MB unallocated space. This time, I deleted the exFAT partition (instead of directly formatting it to FAT32) creating one large unallocated space, THEN I formatted it to FAT32. I copied the same files to it, and it didn't unmount like Card A did.
(Note: My Galaxy S2 is now running Vanilla RootBox v3.8)
I try to use Card B in my Galaxy S2, and it hangs on the RootBox boot animation. My Slider shows "Preparing External Storage..."
, then quickly disappears, much like Card A did on RR 3.1.2 as previously mentioned. It boots again if I use my 32 GB SDHD MicroSD.
Card B still reads fine as a FAT32 volume on my PC. No sudden unmounts or anything.
And all that brings me here, seeking help from the almighty XDA Forums. Does anyone have any idea why this is happening? How can I get it to work on my Galaxy S2?
UPDATE: My replacement card seems to work without problems. Statistical chance of card failure is now 66.67% instead of 100%.
2nd UPDATE: My second replacement also seems to work without problems. Statistical chance of card failure is now 50%.

I can unfortunately not help you but can sympathise with you. I had similar problems with a 32gb Sandisk card. I do not have such a well documented description of what I did but can say that folders and files simply disappeared from the card after a short period of time!!
A folder containing one short film clip and about 40 photos was first visible on the phone and disappeared after a few hours. I had time to see the film on my phone, take and save a few screen shots from the film and view all the pictures. The next day they were gone. I reconnected to the PC to find no files or folders. The screen shots were still however on my phone saved on the internal memory. Other problems had to do with first being able to save photgraphs taken with the stock camera to the sd card and then not being able to.
Searching here and on other forums revealed that many had similar problems but no solutions.
I eventually asked for advice from a PC hardware store that recommended I ditched the Sandisk card and buy a Kingston, which I did, albeit a 8 Gb.
No problems since then.
Ask amongst your friends if they have a none Sandisk card you can try.
Good luck

Have you tried formatting the card in Recovery (TWRP or CWM should do the trick) or are you formatting with your PC? Also, does the card plug into your PC or are you using the phone as a reader plugged into your PC?

@ vantt1
I had very similar experience to you with two of exactly the same sdcards and I do not believe a solution exists. In short, return them, get your money back and try a different brand. I have since stayed away from SanDisk.
Sent from my GT-I9100 using xda premium

This is the first time that I've had any problems with SanDisk. I also have two 2 GB, a 4 GB, 16 GB and a 32 GB (which I'm currently using in my GS2) which all work perfectly.
I use an internal card reader in my PC, and recovery can't detect the 64 GB MicroSD.
Can someone please confirm if the Galaxy S2's newest stock TouchWiz supports exFAT?

vantt1 said:
This is the first time that I've had any problems with SanDisk. I also have two 2 GB, a 4 GB, 16 GB and a 32 GB (which I'm currently using in my GS2) which all work perfectly.
I use an internal card reader in my PC, and recovery can't detect the 64 GB MicroSD.
Can someone please confirm if the Galaxy S2's newest stock TouchWiz supports exFAT?
Click to expand...
Click to collapse
I'm wondering if your S2 is an original/older S2, maybe a later S2 would recognize the card. This sounds like a hardware issue if Recovery isn't recognizing the SD card.
Some other things to consider which "flavor" of S2 you have verses which "flavor" others have who make their 64GB work. By "flavor" I mean the i1900 and i777 and i727 (I think that last one is right). They are all classified as S2s but they all have slightly different hardware builds. I would venture to say the 2, 4, 16, and 32 all work perfect because the S2 was designed with those cards in mind.

dbuckham said:
I'm wondering if your S2 is an original/older S2, maybe a later S2 would recognize the card. This sounds like a hardware issue if Recovery isn't recognizing the SD card.
Some other things to consider which "flavor" of S2 you have verses which "flavor" others have who make their 64GB work. By "flavor" I mean the i1900 and i777 and i727 (I think that last one is right). They are all classified as S2s but they all have slightly different hardware builds. I would venture to say the 2, 4, 16, and 32 all work perfect because the S2 was designed with those cards in mind.
Click to expand...
Click to collapse
Mine is the GT-i9100.

You have to format the card as Fat32 and know that you will lose about 4-5GB of space. Fat32 has some unique sectoring practices.
Samsung also, doesn't/didn't utilize the XC format (a format that was more mainstreamed utilized after the S2s came out if I am correct in what I've been reading) whereas a pc card reader would have no problem. It's a hardware issue, not software.
Another consideration is where did you buy these cards from? You mentioned sending it back. How sure are you that they are legit and not fakes? Some people will buy a fake and never be the wiser. I realize fakes are cheaper alternatives.
At any rate, I hope this helps.

dbuckham said:
You have to format the card as Fat32 and know that you will lose about 4-5GB of space. Fat32 has some unique sectoring practices.
Samsung also, doesn't/didn't utilize the XC format (a format that was more mainstreamed utilized after the S2s came out if I am correct in what I've been reading) whereas a pc card reader would have no problem. It's a hardware issue, not software.
Another consideration is where did you buy these cards from? You mentioned sending it back. How sure are you that they are legit and not fakes? Some people will buy a fake and never be the wiser. I realize fakes are cheaper alternatives.
At any rate, I hope this helps.
Click to expand...
Click to collapse
If you must know, I bought it from the Golden Computer Arcade in Sham Shui Po, Hong Kong (as there are many smaller shops within, I don't think it's necessary to mention the exact store for reasons). They got me a replacement card a few days ago, so when I have time I'll update my situation.
P.S. Hong Kong isn't like mainland China; if they say it's real, it is. Rarely do you find counterfeit products being advertised and sold as their real counterparts (unless you are a tourist). Being a local, I'd be able to tell if something is fake on first inspection from experience. (At least I'm pretty sure I can!)

I may finally have an answer of sorts for you to try. But, don't blame me if you jack up your phone.
Utilizing the app Root External 2 Internal SD you may be able to trick the GS2 into using your 64GB card as the INTERNAL memory and the current 16GB internal as EXTERNAL.
https://play.google.com/store/apps/details?id=eu.codlab.int2ext&hl=en
(Read reviews by other S2 people...some have the 64GB card)
Check this thread for more info:
http://forum.xda-developers.com/showthread.php?t=1905674&page=136
Scroll down the post by Bait-Fish about Root External 2 Internal SD. Seems like it may world

dbuckham said:
I may finally have an answer of sorts for you to try. But, don't blame me if you jack up your phone.
Utilizing the app Root External 2 Internal SD you may be able to trick the GS2 into using your 64GB card as the INTERNAL memory and the current 16GB internal as EXTERNAL.
https://play.google.com/store/apps/details?id=eu.codlab.int2ext&hl=en
(Read reviews by otheay be able to trick the GS2 into using your 64GB card as the INTERNAL memory and the current 16GB internal as EXTERNAL.
php?t=1905674&page=136[/url]
Scroll down the post by Bait-Fish about Root External 2 Internal SD. Seems like it may world
Click to expand...
Click to collapse
It doesn't seem like a practical solution to my problem, and I don't think it will work given the card is dead already.

I just received my replacement card today, and I deleted the exFAT partition and created a FAT32 one. So far so good; my Galaxy S2 detects it and under storage settings it says 59.46 GB as expected. I am now in the process of copying the contents of my 32 GB card to my 64 GB card.

Looks like this one might be a keeper. 27 GB of data was successfully copied to the card, and my Galaxy S2 can read it fine. I will do some speed tests later when I have the time and update when necessary after using the card for a while.

Seems alright. Is the 30Mbps speed the total read+write speed? If so, 7.3+21.1=28.4 which is good enough for me.
The internal memory's read speed is super fast for some reason, but the write speed is slower. Class 80, maybe?

My second replacement card arrived yesterday. It works!

i solved
i have a similar problem too...
i have a new 64gb sd card an i try to copy file (about 20 gb) on it.
i notice that some file 'disappear' in few minutes makes folder empty.
the problem was the usb micro sd adapter i use for connect sd to my pc... it's too older (or the sd card is too big)... the adapter works fine with my old 8-4-2 gb sd card but with this 'big' one it doesn't...
i try to insert the sd card directly in my smartphone and transfer the file on it by its usb cable and it works!
hope this hint may help you.
Have a nice day.
:victory:

Top of the line SanDisk Extreme Pro® microSDHC™ UHS-I

SanDisk Extreme Pro.
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-Fastest transfer speed at 95MB/s*
Up to 95MB/s (633X) read speed. Write speed up to 90MB/s (600X).
Based on internal testing; performance may be lower depending on host device. 1 megabyte (MB) = 1 million bytes.
** 1 gigabyte (GB) = 1 billion bytes
-Featuring Class 10 for "3D" and Full HD† video (1080p)
-Engineered with UHS-I bus architecture
Does anyone have it?
If yes please tell me how you like it.

Not me, although worth pointing out that it won't achieve those speeds formatted to Fat32.

Let's wait for exFAT support and dreams may come true I also bought the UHS 64GB Sandisk, but the Class 10 version. Will come back to you with benchmarks once it's ib the mail
Sent from my Nexus S using xda app-developers app

I have the 32GB of that, runs smooth as butter

mtechfan said:
I have the 32GB of that, runs smooth as butter
Click to expand...
Click to collapse
I'm using SanDisk Ultra microSDHC 64GB UHS-I Class10 without problems.
It only needs to be formated in the phone. When You put it in, the Z will inform You about an unsupported system on the card.
Just go to the memory settings in android and format the card.
Works like a charm, because it gets probably formated as FAT32.

bp_SE said:
I'm using SanDisk Ultra microSDHC 64GB UHS-I Class10 without problems.
It only needs to be formated in the phone. When You put it in, the Z will inform You about an unsupported system on the card.
Just go to the memory settings in android and format the card.
Works like a charm, because it gets probably formated as FAT32.
Click to expand...
Click to collapse
I got the same and it's awesome!

Can you please benchmark them with SD CARD Tester and SD Tools apps and post the results on the same basis I did here with Samsung uhs1? Pls ref to:
http://forum.xda-developers.com/showthread.php?p=38327440
Thx

As requested...
SanDisk Ultra microSDXC 64GB UHS-I Class10
SD CARD Tester, 2502MB : writing 15.63 MB/s - reading 22.63 MB/s
SD Tools: W 10.9 - R 37.1

guys this one is SanDisk Extreme Pro
Any one have exactly that one?

No point spending so much. I got my Transcend UHS-I Class10 which got up to 45MB/s speed for only $30 Singapore Dollars and its lifetime warranty (Although it is not important to many people)

Yep, I have one of these cards, works great. Obviously you will not get any where near the speeds this card is capable of. But I do when I use my UDMA USB 3 card reader , then it all screams into action at near the rated speed. The best I can get through put on the phone is about 10MB/s minimum for Class 10 Rating. But I didn't just buy my card for use in just my phone.
USB 3 interface and UDMA is the only setup that can sustain near these speeds, and your phone doesn't have that.

SanDisk Ultra microSDXC 64GB UHS-I Class10 FAT32 performance
CinqUK said:
As requested...
SanDisk Ultra microSDXC 64GB UHS-I Class10
SD CARD Tester, 2502MB : writing 15.63 MB/s - reading 22.63 MB/s
SD Tools: W 10.9 - R 37.1
Click to expand...
Click to collapse
XPERIA Z, generic SONY
Internal memory (path /sdcard)
SD CARD Tester, 2079MB : writing 16.19 MB/s - reading 22.25 MB/s
SanDisk Ultra microSDXC 64GB UHS-I Class10 FAT32 (path /sdcard1)
SD CARD Tester, 2057MB : writing 11.23 MB/s - reading 22.18 MB/s
The SD card had about 18MB/s write at start, then it dropped.

bp_SE said:
XPERIA Z, generic SONY
Internal memory (path /sdcard)
SD CARD Tester, 2079MB : writing 16.19 MB/s - reading 22.25 MB/s
SanDisk Ultra microSDXC 64GB UHS-I Class10 FAT32 (path /sdcard1)
SD CARD Tester, 2057MB : writing 11.23 MB/s - reading 22.18 MB/s
The SD card had about 18MB/s write at start, then it dropped.
Click to expand...
Click to collapse
Thank you my friend !

To compare with!
Kingston microSDXC 64GB, Class 10
FAT32
R: 14.28MB/s W:12.88MB/s
exFAT
R: 30.24MB/s W: 12.25MB/s

Samsung Micro SDXC 64 Go Pro UHS-1 (Class 10) works fine on my Xperia Z.
SD CARD Tester, 2493MB : writing 15.5 MB/s - reading 22.7 MB/s
SD Tools: W 13.3 - R 38.1

bp_SE said:
XPERIA Z, generic SONY
Internal memory (path /sdcard)
SD CARD Tester, 2079MB : writing 16.19 MB/s - reading 22.25 MB/s
SanDisk Ultra microSDXC 64GB UHS-I Class10 FAT32 (path /sdcard1)
SD CARD Tester, 2057MB : writing 11.23 MB/s - reading 22.18 MB/s
The SD card had about 18MB/s write at start, then it dropped.
Click to expand...
Click to collapse
Wow interesting
SD Tools. sdcard1 starts at about 14MB/s Write then drops to 12MB/s
Read starts at 46MB/s then drops to 37.4MB/s
Internal SD 17.4MB/s write and 25.3MB/s read
SD Card Tester sdcard1 starts at 50MB/s then drops back to 17MB/s for write, read starts at 40MB/s then drops back to 36MB/s

To everyone with a 64gig card, are you rooted? Updated to 4.2?
I feel that I'll get a new card before I decide to root the phone, or, before I get an update. If I get a 64gig now (in anticipation for the update), will it work at all?

exFAT is supported on official 4.2.2

TracerBullitt said:
To everyone with a 64gig card, are you rooted? Updated to 4.2?
I feel that I'll get a new card before I decide to root the phone, or, before I get an update. If I get a 64gig now (in anticipation for the update), will it work at all?
Click to expand...
Click to collapse
Not rooted, not on 4.2, using 64gb card.
Sent from my C6606 using XDA Premium 4 mobile app

so it makes no difference in speeds if its formatted to fat32?

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

What speeds are you all getting on your MicroSD cards? Are my speeds super slow?

I've gone through three of these now, and they're supposed to be super-fast cards. Every time I get one, the first thing I do is test it on my phone using A1 SD Bench, and my speeds are abysmal.
Samsung 256GB 100MB/s (U3) MicroSDXC EVO Select Memory Card with Adapter (MB-ME256GA/AM)
I'm getting around 14MB/s for read speeds and 18MB/s for write speeds. I've also noticed that it takes forever to transfer files to the phone's sd card from the computer.
Is this normal?

fachadick said:
I've gone through three of these now, and they're supposed to be super-fast cards. Every time I get one, the first thing I do is test it on my phone using A1 SD Bench, and my speeds are abysmal.
Samsung 256GB 100MB/s (U3) MicroSDXC EVO Select Memory Card with Adapter (MB-ME256GA/AM)
I'm getting around 14MB/s for read speeds and 18MB/s for write speeds. I've also noticed that it takes forever to transfer files to the phone's sd card from the computer.
Is this normal?
Click to expand...
Click to collapse
Sounds like you might have a faulty card ? As that's pathetic minimum speed should be 30MB/s
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true. my Pro+ on computer reach atleast 60/60 but on my phone write max only 20 and read max about 40

N1NJATH3ORY said:
Sounds like you might have a faulty card ? As that's pathetic minimum speed should be 30MB/s
Click to expand...
Click to collapse
That's what I was thinking, but 3 faulty cards in a row? All giving the same results? What do you get running a1 sd bench on the phone?

Samsung cards have issues in Samsung phones. Go through all the samsung mobile xda forums, S7, S7 edge, S8 S8 plus, they will all have threads with issues with Samsung cards.
In fact, every phone i've had has had complaints about Samsung cards.
Personally I think they're junk.
Just run a1 sd benchmark on a sandisk class 10 sd card in mine, nothing special and dirt cheap and get 58.72 read and 18 write

I don't own Samsung 256GB 100MB/s (U3) MicroSDXC EVO card at the moment can't you try some other benchmarking software ? Also have you got other capacity Micro sd cards what speed are they performing at ?

I'm using this card:
http://www.samsung.com/us/computing...vo-256gb-memory-card-w-adapter-mb-mc256da-am/

Sure the cards are authentic and not fakes? There are a lot of fake Samsung SD cards out there that look surprisingly real. Do a Google search and you will see how to tell the difference.
(Edit) I just downloaded and tested A1 SD Bench and the speed reported for my Samsung Pro card is WAY OFF from what the card actually does. In a PC USB 3 reader writer I get around 90 mbps, SD Bench only shows about 30 mbps. Huge difference.

Salval said:
I'm using this card:
http://www.samsung.com/us/computing...vo-256gb-memory-card-w-adapter-mb-mc256da-am/
Click to expand...
Click to collapse
I'm pretty sure androbench doesn't test sdcards. Did you try in a1 sd bench also?

N1NJATH3ORY said:
I don't own Samsung 256GB 100MB/s (U3) MicroSDXC EVO card at the moment can't you try some other benchmarking software ? Also have you got other capacity Micro sd cards what speed are they performing at ?
Click to expand...
Click to collapse
Also tested with crystalmark (or whatever it's called) with us 3 adapter and got same speeds. Using a SanDisk ultra in here now, and it's testing at about 60mb/s read and 17 mb/s write. This was the first card I tested other than those samsungs, so it looks like the issue is with the cards.

Jonathan-H said:
Samsung cards have issues in Samsung phones. Go through all the samsung mobile xda forums, S7, S7 edge, S8 S8 plus, they will all have threads with issues with Samsung cards.
In fact, every phone i've had has had complaints about Samsung cards.
Personally I think they're junk.
Just run a1 sd benchmark on a sandisk class 10 sd card in mine, nothing special and dirt cheap and get 58.72 read and 18 write
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I have that same card (the 200 fb one?) in the phone now, and I'm getting the same results as you. I saw all the comments about Samsung cards but no actual scores, so I didn't know if it was just me. I wasn't expecting it to be close to 100mb/s read and write, but I was expecting hell of a lot more than 18. Samsung's going to send me a replacement without going through Amazon, we'll see how that one works out.

A1

Write: 45mb/s
Read: 65mb/s
Just tested 5 mins ago.

hinnn said:
Write: 45mb/s
Read: 65mb/s
Just tested 5 mins ago.
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Here's mine, just tested. I think my Evo+ card is faulty, same as OP. However, i have no tool to benchmark it on PC to make sure...

Michael4407 said:
Here's mine, just tested. I think my Evo+ card is faulty, same as OP. However, i have no tool to benchmark it on PC to make sure...
View attachment 4352726
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Did you try to register this card with samsung website?
I can register my card same as my note 8, so could be real one.

Try this card in another phone (a phone from a friend) and see if you get the same speeds. If so, then the card is faulty.
However, if the same card has higher speeds when used with another phone, then the issue might be with your phone.

Samsung MicroSD card fraud!!! tyty much
I never respond to forum posted I read, but how you say..I felt compelled to after your shared knowledge led me down the path to refund in the works. My Samsung 256GB EVO Plus UHS-I U3 Class 10 microSDXC card got a read of 13mb/s and write of 14mb/s with the A1 SD Bench. After some investigation, I found out the card was made in Taiwan, not Korea. Meaning, yep, FRAUD.
Bit Banger said:
Sure the cards are authentic and not fakes? There are a lot of fake Samsung SD cards out there that look surprisingly real. Do a Google search and you will see how to tell the difference.
(Edit) I just downloaded and tested A1 SD Bench and the speed reported for my Samsung Pro card is WAY OFF from what the card actually does. In a PC USB 3 reader writer I get around 90 mbps, SD Bench only shows about 30 mbps. Huge difference.
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