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 Post subject: Cleared G-list, recovered data. Still only zeros. Normal?
PostPosted: May 7th, 2017, 7:48 
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Joined: May 7th, 2017, 7:19
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Location: Norway
Hi. In relation to a project I am working on I have been doing the following on a WD2500AVJS:

Wiped the disk (dban, three pass)
Verified in a hex viewer that there is all zeros over the disk
Cleared the G-list using PC-3000
Scanned and recovered aprox. 100 leftover files (from previously marked bad sectors), using PC-3000

So far as expected, but.. when looking at the disk again in the hex-viewer, it´s still all zeros. Is this normal? Or should I see the previously marked bad sectors now sinc the G-list has been cleared?

All input appreciated! Thanks

-Espen


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 Post subject: Re: Cleared G-list, recovered data. Still only zeros. Normal
PostPosted: May 7th, 2017, 16:09 
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Joined: September 8th, 2009, 18:21
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An ATA Enhanced Secure Erase will also erase the sectors in the G-list.

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 Post subject: Re: Cleared G-list, recovered data. Still only zeros. Normal
PostPosted: May 8th, 2017, 6:32 
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fzabkar wrote:
An ATA Enhanced Secure Erase will also erase the sectors in the G-list.


Thanks. But the question is more if it is natural that a hex viewer only sees zeros after the G-list had been cleared. I would expect the hex viewer to be able to see data from the previously marked bad sectors since the G-list now has been cleared and the data is present at the user area.

Or am I wrong?


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 Post subject: Re: Cleared G-list, recovered data. Still only zeros. Normal
PostPosted: May 8th, 2017, 17:53 
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Joined: October 16th, 2013, 13:21
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Examine the drive again, and see if the g-list has entries again. Maybe the drive´s housekeeping has marked those blocks as bad again


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 Post subject: Re: Cleared G-list, recovered data. Still only zeros. Normal
PostPosted: December 25th, 2017, 17:45 
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fzabkar wrote:
An ATA Enhanced Secure Erase will also erase the sectors in the G-list.
but it doesn't erase the g-list itself

apparently nothing can edit the g-list (except scam apps for millionaires like pc3000)

even powerful allegedly "low level" apps like mhdd are powerless against the g-list


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 Post subject: Re: Cleared G-list, recovered data. Still only zeros. Normal
PostPosted: December 25th, 2017, 18:38 
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westgate wrote:
fzabkar wrote:
An ATA Enhanced Secure Erase will also erase the sectors in the G-list.
but it doesn't erase the g-list itself

apparently nothing can edit the g-list (except scam apps for millionaires like pc3000)

even powerful allegedly "low level" apps like mhdd are powerless against the g-list


Depending on the drive you could edit/clear the G-List for free ....

PC-3000 is not an app ... It's an hardware/software complex for data recovery firms to fix firmware and extract data out of damaged drives.

To edit/clear G-List on the majority of modern drives you might get away with a $350 SeDiv that will support a huge amount of drives on the market.

There are free options depending on the drive you want to edit.

If you have for example a WD drive you can download the G-List using free demo tools like WDMarvel. The commands to clear the "G-List" (or A-List) on drives like Samsung are very well known. For Seagate F3 arch if you have a $5 USD TTL adaptor you can clear the G-List (and mess your translator) with a single terminal command ...

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 Post subject: Re: Cleared G-list, recovered data. Still only zeros. Normal
PostPosted: December 25th, 2017, 18:42 
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westgate wrote:
(...)
apparently nothing can edit the g-list (except scam apps for millionaires like pc3000)

even powerful allegedly "low level" apps like mhdd are powerless against the g-list


Clearing A-list (on Samsung drives the G-List is called A-List) with a single VSC on Samsung :

http://www.hddoracle.com/viewtopic.php? ... t=20#p9726

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