Windows users should use h2testw
On Linux, I use f3write / f3read which operates similarly; it writes a number of 1Gb files until the media is full. Here is a 4Gb card which has been sold as a 32Gb card by this eBay seller https://www.ebay.co.uk/itm/Samsung-32GB ... 2749.l2649
Code: Select all
$ ./f3write /media/david/AC26-2B24
Free space: 28.91 GB
Creating file 1.h2w ... OK!
Creating file 2.h2w ... OK!
Creating file 3.h2w ... OK!
Creating file 4.h2w ... OK!
Creating file 5.h2w ... OK!
Creating file 6.h2w ... OK!
Creating file 7.h2w ... OK!
Creating file 8.h2w ... OK!
Creating file 9.h2w ... OK!
Creating file 10.h2w ... OK!
Creating file 11.h2w ... OK!
Creating file 12.h2w ... OK!
Creating file 13.h2w ... OK!
Creating file 14.h2w ... OK!
Creating file 15.h2w ... OK!
Creating file 16.h2w ... OK!
Creating file 17.h2w ... OK!
Creating file 18.h2w ... OK!
Creating file 19.h2w ... OK!
Creating file 20.h2w ... OK!
Creating file 21.h2w ... OK!
Creating file 22.h2w ... OK!
Creating file 23.h2w ... OK!
Creating file 24.h2w ... OK!
Creating file 25.h2w ... OK!
Creating file 26.h2w ... OK!
Creating file 27.h2w ... OK!
Creating file 28.h2w ... OK!
Creating file 29.h2w ... OK!
Free space: 0.00 Byte
Average writing speed: 7.31 MB/s
$ ./f3read /media/david/AC26-2B24
SECTORS ok/corrupted/changed/overwritten
Validating file 1.h2w ... 2097152/ 0/ 0/ 0
Validating file 2.h2w ... 2097152/ 0/ 0/ 0
Validating file 3.h2w ... 1162688/ 0/ 0/ 0 - NOT fully read due to "Input/output error"
Validating file 4.h2w ... f3read: Can't open file /media/david/AC26-2B24/4.h2w: No such file or directory