I used h2testw on Windows to do this. It writes a 1-GB files with a special pattern on the disk until it is full (or however many GB you specified before starti

I used h2testw on Windows to do this. It writes a 1-GB files with a special pattern on the disk until it is full (or however many GB you specified before starting it). It then tries to read them all back to see if they have been written correctly.