If you have Windblows, this may help you: I had an SD card that was causing my XP computer to freeze when I tried copying stuff over to it. Here's what I did, and it has been working fine for several weeks: 1) used the HDD Low Level Format Tool from HDDGURU.com 2) right clicked on My Computer, chose "manage", manged discs, right clicked the SD card and told it to format After 1,by breaker - Homebrew General