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sectors
Yes, typically a hard drive has 0 bad sectors. Once a drive starts to develop bad sectors it typically means that the drive is failing. If you don't want to replace the drive right now, you should back up your drive and keep the backup current.
AN 80GB drive will have about 78,125,000 sectors on each side.
512 512
The command used to format a drive is "Format".
defragment
If you are using Windows 2000, XP or Vista (or variants):To locate bad sectors and attempt to recover data on drive letter C,Click start, click run, then type "chkdsk c: /r /f"A black command prompt window should pop up. It will ask you if you'd like to schedule a chkdsk on the next restart. Answer yes. Restart.This process should remap bad sectors.
Defrag
Size (head, cylinders, sectors)
deltree D:\
in command prompt you would type H:/.