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To: shadowman who wrote (70049)	5/4/2010 11:28:04 PM
From: B.K.Myers	of 110655

"A sector is a subdivision of a track on a magnetic disk or optical disc. Each sector stores a fixed amount of data. The typical formatting of these media provides space for 512 bytes (for magnetic disks) or 2048 bytes (for optical discs) of user-accessible data per sector." en.wikipedia.org Sectors are established when you format a drive. "A cluster is the unit of disk space allocation for files and directories. To reduce the overhead of managing on-disk data structures, the file system does not allocate individual disk sectors, but contiguous groups of sectors, called clusters." en.wikipedia.org Clusters are created when files or directories are written to the disk drive. A common cause of bad clusters is a program that crashes and doesn't completely close open files. Database programs were common culprits of bad clusters. So, bad clusters don't necessarily indicate that a disk drive is failing. However, bad sectors are a more likely indication that your drive might be starting to fail. Hope this helps. B.K.

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