How to Zero Fill a HDD

Ever needed to zero fill a HDD or flash key, either because you were having trouble with errant device, or a maybe to delete a virus?  Zeroing a hard drive is usually the last resort before either curing or junking.  I’ve known KillDisk ( to cure unfixable Windows file system errors that CHKDSK alone could not fix.

Two further methods are…

  • By using dd under Linux:
 dd if=/dev/zero of=/dev/sda bs=1M

WARNING!!! sda = root partition, replace with correct syntax.  If unsure try:

sudo blkid

(Zeroing will take a while.  Check dd process is truly finished with xterm or system monitor of choice.)

For Macintosh see:

  • Or alternatively use DBAN:

This entry was posted in Apple, Hardware, Linux, Windows and tagged , , , , , . Bookmark the permalink.


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