You have to tell Windows to optimize your SD slot for performance instead of quick removal:
1. Right-click on My Computer and select Properties
2. Click on the Hardware Tab
3. Click on the Device Manager button
4. Click on the little + next to Disk Drives
5. Right-click on USB2.0 CardReader SD0 USB Device and select Properties
6. Click on the Policies tab
7. Click on the Optimize for performance circle
8. Click on OK
Hope this information helps you.
- jmsmrtn98 from http://forums.sandisk.com
Unfortunately this didn't work for me. I'm using a 16GB Class 4 Sony SDHC.
I also tried - format /FS:FAT32 F: - in cmd prompt. Apparently my SD Card is formated as RAW (really?) and it has 0M (0 mb) space available. Then 'Cannot format. This volume is write protected.' Not true. I have a switch, but I've tried both options. so currently my SD Card doesn't work and I'm sad. Apparently this issue is occuring fairly often.