快速 format：只清 fat (file allocation table)
完整 format：完整 format = 快速 format + 掃瞄磁區

要保全，最好用那種刪除檔案後還會寫亂碼到原來所在位置的程式。印象中光靠 format 是無效的，除非是低階 format，不過所有廠商都不建議隨意低階 format。

所以如果要省事，快速 format 即可。要檢查磁區可以用檢查磁區的程式另外掃。


Differences Between a Quick Format and Format During Windows XP Setup
http://support.microsoft.com/defaul...6&Product=winxp

When you choose to run a regular format on a volume, files are removed from the volume you are formatting and the hard disk is then scanned for bad sectors. The scan for bad sectors is responsible for the majority of the time it takes to format a volume.

If you choose the Quick format option, format removes files from the partition, but does not scan the disk for bad sectors. This option should only be used if your hard disk has been previously formatted and you are sure that your hard disk is not damaged.

If you installed Windows on a partition that was formatted by using the Quick format option, you can also check your disk by using the chkdsk /r command after the installation of Windows has completed.