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blachanc
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Fake microSD card ? nope SD USB reader limit (2GIG)

Wed Sep 30, 2015 8:37 pm

I bought two SAMSUNG 16GB EVO Class 10 Micro from Amazon. link

I was unable to copy the new NOOBS/jessie release on them (write error after 2-3 minutes).

I then downloaded h2testw, an sure enough, both cards failed once the process reached above 2048 Mb:

Code: Select all

Error creating file 'D:\3.h2w'.
(The system cannot find the file specified. Code 2)
Warning: Only 15270 of 15271 MByte tested.
Writing speed: 7.49 MByte/s
H2testw v1.4
Just before asking for a refund, as I assumed the cards were fake, I decided to test the microSD card using the laptop built in SD reader.

just stay away from these readers: 1 reader was not working at all, and the next one was limited to 2048Mb
2X USB 2.0 TF card reader

So, for once, the SD card was no the culprit ;)


Ben

Edit: RPDOM provided a logical explanation (post below)
Last edited by blachanc on Thu Oct 01, 2015 11:47 am, edited 1 time in total.
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BMS Doug
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Re: Fake microSD card ? nope fake USB reader

Wed Sep 30, 2015 8:54 pm

I spent far more on my USB card reader, it reads more formats of card.

http://www.poundland.co.uk/signalex-mul ... r-assorted
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DougieLawson
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Re: Fake microSD card ? nope fake USB reader

Wed Sep 30, 2015 9:14 pm

BMS Doug wrote:I spent far more on my USB card reader, it reads more formats of card.

http://www.poundland.co.uk/signalex-mul ... r-assorted
I've got one. They're not bad for the mahoosive price of ¢67
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blachanc
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Re: Fake microSD card ? nope fake USB reader

Wed Sep 30, 2015 10:14 pm

Got it ;) ,
I will go to the Canadian version of "poundland" (dollorama) to see if I can find a similar reader.

Unbelievable that the Reader defect would show the behavior of a fake 2GIG SD card labeled as a 8GIG.
I have no logical explanation for that.

Ben
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rpdom
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Re: Fake microSD card ? nope fake USB reader

Thu Oct 01, 2015 4:29 am

blachanc wrote:Got it ;) ,
I will go to the Canadian version of "poundland" (dollorama) to see if I can find a similar reader.

Unbelievable that the Reader defect would show the behavior of a fake 2GIG SD card labeled as a 8GIG.
I have no logical explanation for that.

Ben
It looks like it only supports the SD standard capacity format, not SDHC. I had some really old microSD Card readers that only handled SD. I had three readers and only one card that worked in them :oops:

BMS Doug
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Re: Fake microSD card ? nope fake USB reader

Thu Oct 01, 2015 7:15 am

rpdom wrote:
blachanc wrote:Got it ;) ,
I will go to the Canadian version of "poundland" (dollorama) to see if I can find a similar reader.

Unbelievable that the Reader defect would show the behavior of a fake 2GIG SD card labeled as a 8GIG.
I have no logical explanation for that.

Ben
It looks like it only supports the SD standard capacity format, not SDHC. I had some really old microSD Card readers that only handled SD. I had three readers and only one card that worked in them :oops:
Agreed, it's the connections to the SD card pins and how they are passed to the USB connection, the SDHC format has a different arrangement of connections.
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blachanc
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Re: Fake microSD card ? nope fake USB reader

Thu Oct 01, 2015 11:45 am

rpdom wrote: It looks like it only supports the SD standard capacity format, not SDHC. I had some really old microSD Card readers that only handled SD. I had three readers and only one card that worked in them :oops:
Ha, here lies the logical explanation.

Incredible that they still sell these in 2015.

Ben
Ps: the kid is still learning :oops:
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MattHawkinsUK
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Re: Fake microSD card ? nope fake USB reader

Thu Oct 01, 2015 2:51 pm

BMS Doug wrote:I spent far more on my USB card reader, it reads more formats of card.

http://www.poundland.co.uk/signalex-mul ... r-assorted
I love the fact you can buy 48 for ... wait for it ... £48. Thanks for the bulk buy offer Poundland!
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blachanc
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Re: Fake microSD card ? nope SD USB reader limit (2GIG)

Thu Oct 01, 2015 4:03 pm

Just realized that the reader were sold as SDHC readers:
FACA 2X USB 2.0 Micro SD SDHC TF Memory Card Reader Mini Adapter For Laptop PC

So I will go ahead and waste my time asking for a refund. ;)
blachanc wrote: just stay away from these readers: 1 reader was not working at all, and the next one was limited to 2048Mb
2X USB 2.0 TF card reader

Ben
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mntmst
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Re: Fake microSD card ? nope fake USB reader

Fri Oct 02, 2015 11:09 pm

BMS Doug wrote:
rpdom wrote:
blachanc wrote:Got it ;) ,
I will go to the Canadian version of "poundland" (dollorama) to see if I can find a similar reader.

Unbelievable that the Reader defect would show the behavior of a fake 2GIG SD card labeled as a 8GIG.
I have no logical explanation for that.

Ben
It looks like it only supports the SD standard capacity format, not SDHC. I had some really old microSD Card readers that only handled SD. I had three readers and only one card that worked in them :oops:
Agreed, it's the connections to the SD card pins and how they are passed to the USB connection, the SDHC format has a different arrangement of connections.
The pins that are used are the same if you access the card with SPI but the internal structure of how blocks are handled is different so the problem might be just old firmware or drivers.
http://elm-chan.org/docs/mmc/mmc_e.html

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blachanc
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Re: Fake microSD card ? nope fake USB reader

Sat Oct 03, 2015 2:49 am

mntmst wrote:
The pins that are used are the same if you access the card with SPI but the internal structure of how blocks are handled is different so the problem might be just old firmware or drivers.
http://elm-chan.org/docs/mmc/mmc_e.html
Hum,
you are raising some doubts in my mind. I just upgraded that laptop to windows 10.
I will need to try another reader at one point.

I will keep your comment in mind.
Thanks,

Ben
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