Comment 65 for bug 458334

Same problem here. Formatting the drive to fat32 (dare I say it!) worked for me.

 /dev/sdb had and exclamation point by it; /dev/sdb1 did not. I was able to write to /dev/sdb1

I don't know what the original format was. I tried reformatting to ext3 with gparted. Same problem until I reformatted to fat32.