I use H2w to test my 512 sd card, and i took 1 day.
Warning: Only 501726 of 501728 MByte tested.
The media is likely to be defective.
26.7 GByte OK (56198327 sectors)
463.1 GByte DATA LOST (971336521 sectors)
Details:0 KByte overwritten (0 sectors)
0 KByte slightly changed (< 8 bit/sector, 0...