I bought 2 for a trip around India.
I formatted them both before I used them for the first time.
Both corrupted. Came up with 'file error' for certain photos and windows won't touch them. Must be FAT problem or something similar.
I had 4 other memory cards and none of them had any problems whatsoever.
I managed to connect my computer to my camera directly to recover my photos but won't be using them again for anything other than emergency backup disks.
AVOID! Spend a few pound more and get better ones. Don't take the risk with these cards.