What exactlly are you trying to do? Maybe I understand wrong, but on a hard drive or a flash drive or whatever, there is formating and the drive is infact not ever blank (even from the factory it has some info written on it). A cd or dvd is actually blank (no formatting) so you are not going to be able to read a capacity or anything else like that. Are you able to burn things ok? If so, it sounds normal to me.