Are there any further tests I can do to check my 128GB micro SD card is genuine?

Avatardeleted49493214
Found 24th Jan 2015
I took a punt on a 128GB Samsung 128GB UHS-1 micro SD card from Ebay (100% feedback ebayer). The packaging looks genuine, & the card registers as having 120GB space after doing the following (as to be expected);

electroons.com/blo…os/

I am now running H2testw which after 67GB of writing has yet to find any errors. It is running at 12.7MByte/s (limited by the card reader speed on my system).

So yes, assuming this completes without any errors, is there any other test I need to perform to verify it is a full capacity 128GB card?

Many thanks
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14 Comments
Im sorry if im thinking wrong, but wont a 128gigabyte card show as around 120GB?

128 gigabytes is 128 billion bytes or 128000000000 bytes, so...

128000000000 / 1024 = 125000000 kilobytes
125000000 / 1024 =122070.3125 megabytes
122070.3125 / 1024 = 119.21 gigabytes

Maybe im wrong?
Well given the speed you writing to the card any full test or complete fill of the card is going to take over 2 1/2 hours to perform.
Id just fill it will files and see if it errors near its top limit
If you read the disclaimer on the memory cards packaging you will find that most manufacturers decimalise the storage capacity. This results in the memory card appearing to have a larger storage capacity than in reality.
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deleted494932
katchiib

Im sorry if im thinking wrong, but wont a 128gigabyte card show as around … Im sorry if im thinking wrong, but wont a 128gigabyte card show as around 120GB?128 gigabytes is 128 billion bytes or 128000000000 bytes, so...128000000000 / 1024 = 125000000 kilobytes125000000 / 1024 =122070.3125 megabytes122070.3125 / 1024 = 119.21 gigabytesMaybe im wrong?



Sorry, I wasn't quite clear in the original post. When I said it 'still shows as having 120GB', what I mean is that even after a full card wipe (removing the 20mb partition which was on it which I thought might have housed a deceitful firmware or something), it still registers as 120GB.
I.e., it is showing exactly what I hoped it would be showing

arachnoid

Well given the speed you writing to the card any full test or complete … Well given the speed you writing to the card any full test or complete fill of the card is going to take over 2 1/2 hours to perform.Id just fill it will files and see if it errors near its top limit



Yep, I'm just going to leave it running - but thought there may have been other tests that need to be performed? If H2TestW is the only one I need to run, then things are looking good for my £34 128GB card
Edited by: "deleted494932" 24th Jan 2015
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deleted494932
redsnappa

If you read the disclaimer on the memory cards packaging you will find … If you read the disclaimer on the memory cards packaging you will find that most manufacturers decimalise the storage capacity. This results in the memory card appearing to have a larger storage capacity than in reality.



Sorry, my original question wasn't clear (now edited). I was expecting it to be 120GB after formatting ... I just wanted to know if there were any other tests besides H2testw that I should run to check it is a proper 120/128GB card.

As has been said already though, H2TestW is all that seems to be required...so I'm pretty pleased at the moment with having a full sized 120/128GB card for £34
Edited by: "deleted494932" 24th Jan 2015
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deleted494932
I guess it was too good to be true, and it was;

Warning: Only 122873 of 122874 MByte tested.
The media is likely to be defective.
7.6 GByte OK (16059136 sectors)
34.1 GByte DATA LOST (71597312 sectors)
Details:34.1 GByte overwritten (71584030 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
6.4 MByte corrupted (13282 sectors)
4.6 MByte aliased memory (9472 sectors)
First error at offset: 0x00000001e6560000
Expected: 0x00000001e6560000
Found: 0x00000001ea560000
H2testw version 1.3

Still, I have had a full refund, and get to keep the little micro USB card reader too.
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deleted494932
dcx_badass

From the results of that test you didn't let it finish? But yeah it looks … From the results of that test you didn't let it finish? But yeah it looks like it's a hacked 8GB card, I paid £29.50 for a real 128GB card, although is full size SD. Hopefully microSD will hit the same price this year. I've got a pile of fake memory sticks here, 2 128GB sd cards and 3 128GB usb sticks, I only buy from proper retails, even if it's ebay I'll only use the ebay sites of real stores (7dayshop, mymemory, etc). No point even bothering from any other sellers, I never pay more than £10 though, wouldn't risk £30+. What's their feedback number, if they're shifting fakes but are 100% feedback it must be a low number.



The complete read and write test will take about 6 hours. Those results were from the 4 hour mark. The 'failed' part of the drive keeps increasing...so I dare say it will end up being a 8GB card.
They have 100% feedback with 450 sales. Though rather tellingly, the only other person to leave 128GB feedback was also complaining about it being counterfeit.
Anyway, the seller was very polite, apologised, and said he'd be informing the other buyers (who knows if he actually will or not).
But yes, lesson learned
Many buyers will never test micro sd cards to check on capacity and speed. So they will not know many ebay sellers ,sell fakes.
Years ago I bought a 32GB pen drive, which after tests was really a 4GB. That was the last time I order any storage media from eBay.
Another way of checking is by filling the SD card in your case 128GB, removing it from the PC then reinserting it that will show you how much data is still in storage and how much of it has gone missing.
Worth naming the seller? Would save a lot of future buyers a lot of hassle. Pretty concerning that they have 100% feedback too as you're more inclined to buy.
I once bought a counterfeit SanDisk SD card on eBay. The seller foolishly admitted to me that it was counterfeit. Her eBay account had 100% positive feedback from selling these fake SanDisk SD cards. I reported her to Trading Standards and they paid her a visit with the Police.

Believe me just because someone has 100% feedback doesn't guarantee its genuine. I steer clear of eBay for things like memory cards where counterfeits are rife.
Most people do not know that these cards are fake because they show up as their advertised capacity. I have seen numerous sellers on eBay with 100% feedback and when you look at the cards, you can tell they're fake with their fake packaging and 'too good to be true' price.

If it's a fake then leave negative feedback.

Edited by: "rikkif1990" 30th Jan 2015
Pretty worrying. I think the seller should be named. I've only ever used Amazon but have come close to ordering them from eBay.
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