Friday, 16 August 2013

Sometimes, things really are too good to be true

Recently, while staying with my parents in the US, I was persuaded to purchase a 64 gb micro SDHC card from eBay.

The price seemed too good to be true (around $20), but the seller had a good rating, and maybe the card was legitimately this size, so we ordered it, and it arrived quickly.

Then the problems began.  I tried to format it to NTFS, and Windows reported the card could not be formatted, but formatting back to exFat yielded a 64 gb card!

A little digging turned up a small utility named H2testw v1.4, which is a burn in test program for SD cards.  Here’s the result on this “bargain” card:

The media is likely to be defective.
1.9 GByte OK (4091392 sectors)
60.5 GByte DATA LOST (126972416 sectors)
Details:0 KByte overwritten (0 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
60.5 GByte corrupted (126972416 sectors)
0 KByte aliased memory (0 sectors)
First error at offset: 0x000000007abc0000
Expected: 0x000000007abc0000
Found: 0x0000000000000000
H2testw version 1.3
Writing speed: 8.48 MByte/s
Reading speed: 5.67 MByte/s
H2testw v1.4

A little more digging turned up an article on counterfeit sd cards:

Naturally we returned the item, and the seller refunded, but they also attacked other buyers who reported the fakes. 

So, my advice:  Stick to a reputable seller, like Amazon, and do make sure you check the actual seller.