Here is what I have:
Sandisk 2GB microSD (not microSDHC) unknown class - Working fine/no problems
TOPRAM 16GB microSDHC class 4 - corrupted daily, so basically unusable. Also found that it didn't work in a car SD MP3 player that all my other SD cards did work in.
Kingston 8GB microSDHC class 4 - has been working perfectly for 2 weeks.
Samsung 2GB microSD unknown class - no issues
Toshiba 1GB microSD unknown class - no issues
Sandisk 2GB microSD (not microSDHC) unknown class - Working fine/no problems
TOPRAM 16GB microSDHC class 4 - corrupted daily, so basically unusable. Also found that it didn't work in a car SD MP3 player that all my other SD cards did work in.
Kingston 8GB microSDHC class 4 - has been working perfectly for 2 weeks.
Samsung 2GB microSD unknown class - no issues
Toshiba 1GB microSD unknown class - no issues