On 08/19/2010 11:25 AM, Stephen Gallagher wrote:
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> On 08/19/2010 02:04 PM, mike cloaked wrote:
>> On Thu, Aug 19, 2010 at 6:51 PM, Tim<firstname.lastname@example.org> wrote:
>>> On Thu, 2010-08-19 at 17:17 +0100, mike cloaked wrote:
>>>> if I plug the old (not-very-healthy!) disk in to a sata-to-usb
>>>> external adapter, and then hotplug the usb cable into the new machine
>>>> on a usb port, I am guessing that I will not be able to pass hdparm
>>>> commands to the old disk connected in this way
>>> It depends on the chips in the adapters (see hdparm docs). Mine don't
>>> support it, and the only one of them that I can warn you about is the
>>> Seagate desktop expansion drive, the others have no branding.
>> OK thanks - if anyone knows of a specific adapter that *will* work I
>> would like to know - of course having the drive in its internal bay is
>> likely not to work either since many (most?) bioses will freeze the
>> drive from the ata command viewpoint such that it can't be unlocked to
>> pass the secure erase command anyway! So having an external adapter is
>> probably the only way I can easily do it but I do need to know that
>> there is an external adapter that will work. What I was unsure of is
>> whether there is any that would work since I had been told that usb
>> can't do it at all!
>> (I did look at the hdparm man command but did not see the answer to
>> the latter question)
> Well, you could always just perform a mostly secure wipe by just doing
> dd if=/dev/urandom of=/dev/sdc
> several times, so that the bits are overwritten by random data.
UCSD had released a paper a few years ago claiming that the
drive's own firmware can do the full erase.
The utility's name was HDDEraseWeb.zip
I do not know if it does or not - they did not release the
source code, which makes it completely untrustworthy.
For a university to release only the executable and not
the source code raises red flags.
You can always resort to these linux tools:
scrub(1), shred(1), wipe(1)
The key is to run the process with a high number of iterations.
If the drive or partitions cannot be erased while booted, then
you can resort to booting from live CD and then run
dd if=/dev/urandom of=/dev/sdX (whatever you target disk X stands for).
will wipe the whole drive. Of course you can choose a partition thereof.
The key is you iterate the above about 10 times.
Start when the disk is cold and has been lying un-powered.
There is a very good reason for this.
I leave it to you to figure that out why
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