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removing boot sector

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you can use the Windows utility called diskpart. Run it from an adminstrative command prompt. Be sure to select the correct disk, and then issue the clean command. See this link: http://support.microsoft.com/kb/300415. If you wish to completely delete all traces of data from an entire disk, it is best to use a software package that can provide high security wiping of the disk to prevent data recovery.

The CLEAN command of diskpart will erase formatting information, but data can still be read. Drive wiping provides additional level of security. Many disks (all SSDs, but not all BIOSes) support ATA secure erase that completely anihilate any information on the disk. Google for ATA secure erase.

Pat L you are right, but using ATA secure erase can sometimes be difficult. If used on externally connected drives and there is a problem during the erase operation, the drive may lock, and then no longer be useable unless removed from the external enclosure and directly connected to a controller. Although ATA secure erase is a good feature, it is not for the average user, and best left to IT pro's or very experinced users.