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 Post subject: Toshiba P-list recovery
PostPosted: May 8th, 2018, 14:31 
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Joined: January 12th, 2016, 3:46
Posts: 47
Location: India
Again a Toshiba with a new issue. It surely indicates Toshiba is been replaced by Seagate.here in India.
I have got a Toshiba DT01ACA100 1Tb Desktop hard disk. Drives Heads were weak ,so we replaced by 100% compatible Healthy Heads , We have been able to read few modules as well. However crucial P-List is Zero filled ( is empty).
Earlier client has given disk to other companies . We have confirmed pcb is native . Is there any way to know how p-list has suddenly become zero ?
Has someone gone through similar situation before ? Without P-list Recovery will not be possible.
If Donor Heads put back in Donor they work fine so there is no damage to platters.
How to deal with this situation? Can someone pls. help.
Thanks .


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 Post subject: Re: Toshiba P-list recovery
PostPosted: May 8th, 2018, 14:37 
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Joined: December 19th, 2006, 8:49
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DT01ACA100 - Hitachi ARM and NOT TOSHIBA ...

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 Post subject: Re: Toshiba P-list recovery
PostPosted: May 8th, 2018, 14:42 
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Joined: December 19th, 2006, 8:49
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What modules were you able to read and with WHAT utility ?

Seagate is JUNK (F3 ARCH drives). Those HGST drives are good.

What is the problem with the drive ? Can't you read LBAs at all ? Does the drive ID ?

On Toshiba native it should be possible to scan LBAs even if P-List is gone but you will have data shifts if you clone/image unless you can reach bad sector and add it manualy to P-List to rebuild it but if the bad sector is "recent" even if it were added to G-List you will get shifts as well. If you do a good job you can still recover the data. This assuming you have a cleared DD. This doesn't apply to HGST.

On HGST you shouldn't be able to read sectors past the first entrie on P-List. This is the same as with partial access problem on F3 Arch as CRC/Header of sectors will not match translator. Still possible to "fix" but expect to spend a huge amount of $$$$

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 Post subject: Re: Toshiba P-list recovery
PostPosted: May 8th, 2018, 14:44 
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Joined: December 19th, 2006, 8:49
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posidon wrote:
Earlier client has given disk to other companies . We have confirmed pcb is native . Is there any way to know how p-list has suddenly become zero ?


:idea:

Earlier client has given disk to other companies !

Does the "other companies" have tools to clear the P-List in case the client declines to pay ?

:lol: :lol: :lol:

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 Post subject: Re: Toshiba P-list recovery
PostPosted: May 8th, 2018, 14:48 
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Joined: December 19th, 2006, 8:49
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Location: Portugal
posidon wrote:
Again a Toshiba with a new issue. It surely indicates Toshiba is been replaced by Seagate.here in India.
I have got a Toshiba DT01ACA100 1Tb Desktop hard disk. Drives Heads were weak ,so we replaced by 100% compatible Healthy Heads , We have been able to read few modules as well. However crucial P-List is Zero filled ( is empty).
Earlier client has given disk to other companies . We have confirmed pcb is native . Is there any way to know how p-list has suddenly become zero ?
Has someone gone through similar situation before ? Without P-list Recovery will not be possible.
If Donor Heads put back in Donor they work fine so there is no damage to platters.
How to deal with this situation? Can someone pls. help.
Thanks .


If this is really HITACHI and if all copies of P-List are gone and if the drive doesn't have any other problem (just a P-List erased/deleted by other DR FIRM) i think that i could rebuild it but i would have to charge some considerable amount of $$$ and i would need to have the drive with me as i'm not using PC-3000.

The "plan" would involve attempt to read copies of the P-List and if it fails attempt to read by LBA to the first problematic sector and add to P-List manualy and re-scan and so on up untill drive provides 100% LBA access. It might be very time consuming if there are a huge amount of defects on P-List.

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 Post subject: Re: Toshiba P-list recovery
PostPosted: May 8th, 2018, 21:48 
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Joined: January 12th, 2016, 3:46
Posts: 47
Location: India
Hi Spildit
Thanks :good: You are single handedly managing battle.
I will post all drive details which might throw light on the case.
Thank you so much.


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 Post subject: Re: Toshiba P-list recovery
PostPosted: May 9th, 2018, 14:04 
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posidon wrote:
Hi Spildit
Thanks :good: You are single handedly managing battle.
I will post all drive details which might throw light on the case.
Thank you so much.


Please do post more info as well like what PC3K utilities you did use, etc ...

Regards.

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 Post subject: Re: Toshiba P-list recovery
PostPosted: May 10th, 2018, 10:25 
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Joined: January 12th, 2016, 3:46
Posts: 47
Location: India
Hi Spildit
I have sent you nvram and rom in PM.
Thanks


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 Post subject: Re: Toshiba P-list recovery
PostPosted: May 15th, 2018, 2:04 
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Joined: January 12th, 2016, 3:46
Posts: 47
Location: India
Update on this case ---- Tragic End

It seems this disk is one of the Non-Recoverable type. I think drives SA is having bad sectors , actually P-list might not be zero filled but due to defects it might appear empty. As spildit has outlined P-list can be rebuild by manually adding defects ,but is it too much time consuming and if SA is bad then P-list cant be written .I have tried to write few bytes in SA modules but it cant be written.
A tragic and sad end to this case shattering customers critical data and hopes . A failure is hard to disgest. :(


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 Post subject: Re: Toshiba P-list recovery
PostPosted: May 15th, 2018, 15:12 
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Joined: December 19th, 2006, 8:49
Posts: 9510
Location: Portugal
posidon wrote:
Update on this case ---- Tragic End

It seems this disk is one of the Non-Recoverable type. I think drives SA is having bad sectors , actually P-list might not be zero filled but due to defects it might appear empty. As spildit has outlined P-list can be rebuild by manually adding defects ,but is it too much time consuming and if SA is bad then P-list cant be written .I have tried to write few bytes in SA modules but it cant be written.
A tragic and sad end to this case shattering customers critical data and hopes . A failure is hard to disgest. :(


I would still try to contact member drHDD and check if he can help you out :

memberlist.php?mode=viewprofile&u=31114

Regards and good luck.

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