Most other bad spots on a disk will be flagged as "Not Usable" when you format a disk. This is why a disk cannot be fixed that has a damaged MBR (Master boot record). I use to use one to create a catalog of what programs were on my disks just by insertting them into the drive via a "MS Basic program". Since using windows I have lost interest in these type of utilies but I believe they are still out there. I believe all medias are assigned a s/n by the format process when they are formatted. These areas are not reachable via the regular explorer access. These areas also contain info such as media type, manufacturer etc. Back in my earlier days of computing (the 80's) there were DOS utilies that could access the areas (sectors and clusters) reserved on a media for such things as FAT tables and table logs of bad spots on a disk whether it be a floppy or harddrive.
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