OT: Can Reformatting A Hard Drive To ext3 Destroy All the Data On It?
Robert L Cochran
cochranb at speakeasy.net
Wed Jun 3 01:52:01 UTC 2009
On 05/29/2009 09:46 PM, Robert L Cochran wrote:
> On 05/29/2009 05:44 PM, Alan Cox wrote:
>>> 'shred' is part of coreutils (i.e. installed by default).
>>> Doing something like
>>> shred /dev/sdX
>>> as root will write various bit patterns 25 times over the entire drive
>>> (see the man page for more options).
>> Whoopeeedoo. Thats still not the correct way to erase a disk.
>> Use security erase, that is why it is there.
> Thanks very much to all who responded! I'm going to use Alan's
> suggestion first of all and if necessary a mixture of everyone else's.
> For good measure maybe I'll dump a pound or so of salt in a gallon of
> nice hot water and drop the hard drive in and wait for signs of rust
> to appear. Ha ha!
> Thanks again!
I bet you all want to know what I did to the hard drive. Well, maybe you
don't. First off, I tried to find out of the drive has a secure erase
# hdparm -I /dev/sdb
HDIO_DRIVE_CMD(identify) failed: Invalid exchange
# hdparm -i /dev/sdb
HDIO_GET_IDENTITY failed: Invalid argument
[It does not seem to have a secure erase feature.]
[So I did this:]
# dd if=/dev/zero of=/dev/sdb bs=1M
dd: writing `/dev/sdb': No space left on device
28630+0 records in
28629+0 records out
30020272128 bytes (30 GB) copied, 1579.48 s, 19.0 MB/s
...and tomorrow, I will remove the circuit board from the drive, and if
time allows, try out the brine-and-cola treatment. Or perhaps I'll
disassemble the drive into parts for my own education.
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