Re: Scrub free disk blocks

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  On 08/28/2010 06:31 AM, Robert Nichols wrote:
> On 08/27/2010 11:53 PM, JD wrote:
>>     On 08/27/2010 09:25 PM, JD wrote:
>>>    Is there a Linux util to scrub free disk blocks and keep everything
>>> else intact ??
>>>
>> Someone (not on this list) described a simple way to do this.
>> Scrubbing files to be deleted is easy enough - there are utils for it
>> already.
>> But scrubbing existing free space is slower and requires patience.
>>
>> cd to the root of the partition.
>> sudo dd if=/dev/zero of=ZERO bs=20M
>>
>> When the dd program fails to write any further, you
>> have grabbed and zeroed all available free disk blocks
>> in the partition.
>>
>> Now all you do is use the command scrub to scrub the file ZERO
>> and when done  the file is deleted.
> You need to do that as the UID permitted to use the reserved blocks
> if you really want to clear _all_ the free space.  Note that if the
> drive has reallocated any bad sectors there could still be some old
> data present on the disk.
Guess you might call that caveat emptor.
There is nothing you can do about
relocated bad blocks.

Perhaps there might be a util that can bypass the driver
and send direct commands to the drive via a SATA port, or
and IDE interface or a SCSI port, to write random
data to the  bad blocks - but such a util would
have to be a standalone utility. Perhaps there is a boot
disk out there with such a util.


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