Wiping a drive.
May 5, 2007 7:40 AM Subscribe
I am trying to wipe my hard drive...
so that I can sell it. I have a copy of Killdisk and a copy of my OS but I get the feeling there is more to the task than wiping the drive and reinstalling the OS. Does anyone have any experience with this?
so that I can sell it. I have a copy of Killdisk and a copy of my OS but I get the feeling there is more to the task than wiping the drive and reinstalling the OS. Does anyone have any experience with this?
Best answer: I've had really good experience with DBAN (Darik's Boot and Nuke). Is there a reason you plan on reinstalling the OS?
posted by homer2k1 at 7:55 AM on May 5, 2007 [1 favorite]
posted by homer2k1 at 7:55 AM on May 5, 2007 [1 favorite]
Best answer: No, that's pretty much it. DBAN or similar will take care of the overwrite and reformatting. (I'm assuming killdisk is something similar.) on preview, 4thing DBAN.
posted by zamboni at 8:10 AM on May 5, 2007
posted by zamboni at 8:10 AM on May 5, 2007
You can use the 'shred' command in Linux. Just boot from a Linux live CD (ie an Ubuntu install CD), and type the following in a terminal window:
shred /dev/hda
if it's an EIDE drive, or for a SATA drive type
shred /dev/sda
Both these two commands assume only one drive in the computer, or that you're trying to wipe the first drive. For safety, I would temporarily disconnect all but the drive you want to wipe.
Shred is supposed to overwrite data enough times to make recovery impossible.
posted by humblepigeon at 8:13 AM on May 5, 2007
shred /dev/hda
if it's an EIDE drive, or for a SATA drive type
shred /dev/sda
Both these two commands assume only one drive in the computer, or that you're trying to wipe the first drive. For safety, I would temporarily disconnect all but the drive you want to wipe.
Shred is supposed to overwrite data enough times to make recovery impossible.
posted by humblepigeon at 8:13 AM on May 5, 2007
Response by poster: I plan on reinstalling the OS to make it easier to sell.
So if I use DBAN, I can just install the OS after it's done, I won't have to partition, format, whatever?
How long does it take for DBAN to wipe a disk?
posted by 517 at 8:16 AM on May 5, 2007
So if I use DBAN, I can just install the OS after it's done, I won't have to partition, format, whatever?
How long does it take for DBAN to wipe a disk?
posted by 517 at 8:16 AM on May 5, 2007
Just to point out, but you should never "low level format" a modern drive.
I believe SCdB is referring more to overwriting all of the data (usually multiple times) in order to prevent future access to it, rather than actual "low level" formatting.
posted by wackybrit at 8:19 AM on May 5, 2007
I believe SCdB is referring more to overwriting all of the data (usually multiple times) in order to prevent future access to it, rather than actual "low level" formatting.
posted by wackybrit at 8:19 AM on May 5, 2007
How long?
Depends on the size of the disk, the kind of computer you have, and the wipe level. Guttman is probably overkill - DoD or DoD Short are probably sufficient for your needs.
posted by zamboni at 8:27 AM on May 5, 2007
Depends on the size of the disk, the kind of computer you have, and the wipe level. Guttman is probably overkill - DoD or DoD Short are probably sufficient for your needs.
posted by zamboni at 8:27 AM on May 5, 2007
Just last week on lifehacker, really wipe it.
"There is no data recovery from Secure Erase"
posted by raildr at 8:44 AM on May 5, 2007
"There is no data recovery from Secure Erase"
posted by raildr at 8:44 AM on May 5, 2007
If you don't want it to take days and you're not particularly worried about someone taking an electron microscope to your disk to recover a few fragments of your porn collection, a simple "dd if=/dev/zero of=/dev/sda bs=1M" or similar will be sufficient (in file=system "zero" pseudo-device, out file=SCSI disk a, block size=1 MB). if=/dev/urandom (unlimited [pseudo-]random device) is slightly "better", but may be slower.
If you want to do it from within Windows, unmount the drive with Disk Manager and use dd for Windows in much the same way.
posted by Freaky at 10:31 AM on May 5, 2007
If you want to do it from within Windows, unmount the drive with Disk Manager and use dd for Windows in much the same way.
posted by Freaky at 10:31 AM on May 5, 2007
DBAN works well, but most modern drives have a special "secure erase" command built in that works even better. (This has been part of the S.M.A.R.T./ATA specification since 2001 or so, so all drives built after then should support it). Who says it's better? NIST for one.
The folks at the UCSD Center for Magnetic Recording Research have a small utility called Secure Erase that will let you issue this command to your drive(s). You can download it by clicking on the link on the left side of this page. (via)
posted by toxic at 3:25 PM on May 5, 2007 [1 favorite]
The folks at the UCSD Center for Magnetic Recording Research have a small utility called Secure Erase that will let you issue this command to your drive(s). You can download it by clicking on the link on the left side of this page. (via)
posted by toxic at 3:25 PM on May 5, 2007 [1 favorite]
This thread is closed to new comments.
Low-level formatting takes a long time. Any "format" operation that doesn't take hours isn't a low-level format.
posted by Steven C. Den Beste at 7:46 AM on May 5, 2007