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 Post subject: Failed Toshiba Recovery analysis
PostPosted: July 9th, 2018, 8:26 
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Joined: January 12th, 2016, 3:46
Posts: 47
Location: India
Recently I have a failed Toshiba case & I am keen to know where I am wrong or if any alternate way of recovery is there.
Hard disk is 1Tb Toshiba Desktop hard disk model - DT01ACA100 . currently it is not supported in Toshiba and has to be accessed through Hitachi utility.
Disk has 2 heads. Disk got normal detection and Head 1 was working fine with Imaging speed of 50Mb/s , however Head 0 was giving lots of read errors.
We swapped heads as we thought that may improve situation , but after head swap read speed of Head 1 has increased to almost 90Mb/s with no change whatsoever from Head 0. Is there any way I can do something ? Where we went wrong. In general how to correctly diagnose disk thoroughly.
I read Dr-Kievs advice on using commands sensibly , I think we will have to change diagnostics steps .
I know Pros like Dr-Kiev work on firmware level manually and it is truely professional. Unfortunately this part is not listed in any manuals and you will have to learn it hard way.Besides small DR persons cant devote required time only for r&D as he is like one man army and has to look into other aspects of the business too.
In big established firms its teamwork and one can focus on speicific issues. Payout to large companies is also high so they can afford to spend time.


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 Post subject: Re: Failed Toshiba Recovery analysis
PostPosted: July 9th, 2018, 10:36 
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Joined: April 3rd, 2011, 0:19
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Likely there is just media damage on the bottom platter surface. It probably got the new heads dirty already. Try the heads back in the donor and see if head 0 is still working fine. Some cases just require multiple sets of heads or repeated cleaning of the heads. Other times, the platter could be just badly damaged and you'll never get a great read of it.

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 Post subject: Re: Failed Toshiba Recovery analysis
PostPosted: July 9th, 2018, 11:45 
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Joined: August 15th, 2006, 3:01
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posidon wrote:
Recently I have a failed Toshiba case & I am keen to know where I am wrong or if any alternate way of recovery is there.
Hard disk is 1Tb Toshiba Desktop hard disk model - DT01ACA100 . currently it is not supported in Toshiba and has to be accessed through Hitachi utility.
Disk has 2 heads. Disk got normal detection and Head 1 was working fine with Imaging speed of 50Mb/s , however Head 0 was giving lots of read errors.
We swapped heads as we thought that may improve situation , but after head swap read speed of Head 1 has increased to almost 90Mb/s with no change whatsoever from Head 0. Is there any way I can do something ? Where we went wrong. In general how to correctly diagnose disk thoroughly.
I read Dr-Kievs advice on using commands sensibly , I think we will have to change diagnostics steps .
I know Pros like Dr-Kiev work on firmware level manually and it is truely professional. Unfortunately this part is not listed in any manuals and you will have to learn it hard way.Besides small DR persons cant devote required time only for r&D as he is like one man army and has to look into other aspects of the business too.
In big established firms its teamwork and one can focus on speicific issues. Payout to large companies is also high so they can afford to spend time.



Well,
Please Inspect Platters ,There is Nothing Like Dr Kiev Can Do And some of Us Cannot .Bad Media Has Nothing To do With Firmware .Secondly Pardon Me but There is Nothing Till Date i Have Seen Or Experienced That Some of us cannot solve here and the man you are talking about can .RIAD is what they stress on .I know some of you will talk about a few professionals that they can do this and that but other then Einstein Sir i have never come across anyone great other then spildit and frank both are very good in firmware ,Frank specially is good in electronics and rom .Others like us are all plus minus each other .There are three to four more that i know but i have never seen just heard they can do better work .The way to do this is when you remove heads just do not swap heads ,Inspect them then take a decision you can definitely find if platter is damaged or not ,Heads speak for themselves

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 Post subject: Re: Failed Toshiba Recovery analysis
PostPosted: July 9th, 2018, 15:24 
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Joined: December 19th, 2006, 8:49
Posts: 9655
Location: Portugal
posidon wrote:
(...)Hard disk is 1Tb Toshiba Desktop hard disk model - DT01ACA100 . currently it is not supported in Toshiba and has to be accessed through Hitachi utility.


This drive is not and will NEVER BE supported by the Toshiba utility because this drive is NATIVE HGST re-branded to Toshiba so it will work just like any other HGST ARM drive.

As stated by the others already most likely you have media damage or bad heads. The described issue doesn't look like "firmware" problem .... If you can ID the drive and image with one head there is no reason for the firmware to be preventing reading with other head.

IBM native and ARM based (branded as Hitachi/HGST) do support some VSCs to disable Background Scan, Soft Error Report, etc ... but i don't think this will help you at all.

My vote goes for bad head(s) or media. Check the heads back on the original donor drive and see if you can still read with all heads. If not the patient did kill the donor head as stated.

Again i'm almost positive that if you did chose your heads correctly your issue is realted to physical damage to the media and not firmware ...

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 Post subject: Re: Failed Toshiba Recovery analysis
PostPosted: July 9th, 2018, 16:21 
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Joined: March 11th, 2008, 4:35
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My vote: its bad head/media

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 Post subject: Re: Failed Toshiba Recovery analysis
PostPosted: July 10th, 2018, 3:31 
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Joined: January 12th, 2016, 3:46
Posts: 47
Location: India
Thanks all of you for valuable suggestions. I would like to stress following --

1) Donor heads are 100% compatible as both disks were brought at same time and except SN every other parameter is same.
2) Head transplant was successful because after transplant speed of other working head 1 has doubled.
3) There is not a single bad sector for head 1.
4) Is it possible that only single surface is degraded more than other one ?
5) We cant use Toshiba utility to correct G-list and reading through utility as spildit has pointed out this is not actually a Toshiba hard disk.

I think correct way to diagnose was to check platter degradation and defects in zones before head transplant.I dont know whether that is possible in hitachi utility.
If this option is not availble or cant be checked then there is no way to check whether the issue is with Heads or Defective zones and surface defects,
there are many super Gurus like Doomer ( for seagate ) , Guru , etc.
I have mentioned Dr-kiev because he has pointed out a crucial issue about commands . Only few posts are there in this regard.
He has shown how a master technician will do recovery than rest of the amature players who are ever ready to fire command like regenerate translator (before that erase NRG list ) and hidden dangers in this type of work.


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 Post subject: Re: Failed Toshiba Recovery analysis
PostPosted: July 10th, 2018, 13:56 
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Joined: December 19th, 2006, 8:49
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Location: Portugal
posidon wrote:
(...)

5) We cant use Toshiba utility to correct G-list and reading through utility as spildit has pointed out this is not actually a Toshiba hard disk.

I think correct way to diagnose was to check platter degradation and defects in zones before head transplant.I dont know whether that is possible in hitachi utility.
If this option is not availble or cant be checked then there is no way to check whether the issue is with Heads or Defective zones and surface defects,
there are many super Gurus like Doomer ( for seagate ) , Guru , etc.
I have mentioned Dr-kiev because he has pointed out a crucial issue about commands . Only few posts are there in this regard.
He has shown how a master technician will do recovery than rest of the amature players who are ever ready to fire command like regenerate translator (before that erase NRG list ) and hidden dangers in this type of work.


This is a HGST ARM so :

1) You don't issue (terminal) commands to the drive like you do with Seagate !!!! You can issue ATA commands to the drive but only a few of us know what commands to use on ARM drives and those are the guys who build tools like PC-3000, etc ... If you use tools those tools will issue the commands, not you !!!!

2) There are no such thing as "regenerate translator with NRG list" on ARM HGST or any other IBM based drive even M24 arch .... This is for things like Seagate.

3) On Hitachi (IBM BASED) sectors do have a header that should match trabslator. If you mess translator you will not read past a certain point of the drive as it would be like a partial access problem. Same as if you add entries on P-List as translator is done on-the-fly ... So if you add an entry to P-List forget about accessing data past that point. If you can read all data on head 1 and assuming you are accessing the data by LBA with head map you are still issuing READ commands on LBA base and the drive is sending you data so .... translator is fine, P-List is fine ...

4) You can't use that Toshiba option to bypass the damaged G-List but you don't need that to start with !!!!

5) You can have loss of adaptives for some zones, i think it might be possible but should be easy to check. If you can't read any LBA on head 0 even if it's on the middle, start and end of LBA range then all head zones are gone and that is not very likely unless you have media damage that will kill the heads.

6) Try to put heads back on donnor and check if you can still read with head 0. If not damage to the platter of patient killed head on donor.

7) I do know several VSCs (Vendor Specific Commands) for IBM NATIVE ARM INLCUDED like your drive and I don't have anything to help in the sense of recovering one surface that is bad. Data recovery firms will just use PC-3000. If PC-3000 can't read the surface then you will not gain access to that entire head with some black magical ata commands .... This is BS. There are things that can help like stop some functionality but for your drive that isn't even relevant ...

Good luck.

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 Post subject: Re: Failed Toshiba Recovery analysis
PostPosted: July 10th, 2018, 22:03 
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Joined: January 12th, 2016, 3:46
Posts: 47
Location: India
Hi Spildit
Thanks for detailed explanation which has thrown light on this model. Since Large no. of these disks are sold ,this information will be surely helpful for other members too.
Here is my observation to points you have put forward --

2) Regenarate translator was specific for Seagate drives only as Dr-Kiev has pointed out risks in using these commands. Here I was not talking about Hitachi Arm drives.
3) Yes your assessment is right , all modules can be read flawlessly not a single error.
5) Loss of adaptive for Head 0 -- How can I check in depth , I can read partially from Head 0 (even before and after transplant) but no. of defects are too large .
Is there way in general (not specific to this case) to check Defective zones and files affected ? This Routine must be implemented before head transplant otherwise like this case its useless as problem was not with heads.
6) If Head restored in donor again , Head 0 works fine.

I think there is nothing left now to try. But I am wondering how only one surface of platter has gone bad ,non affecting other entirely ? Is there any specific reason for this ?
Thanks a lot for all the help


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 Post subject: Re: Failed Toshiba Recovery analysis
PostPosted: July 11th, 2018, 8:17 
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Joined: January 12th, 2016, 3:46
Posts: 47
Location: India
:shock: Twist In the Tale :shock:

Its a TOSHIBA hard disk which is actually HITACHI and is manufactured by WD. I think this erratic and senseless behaviour has something to do with this fact.
Required data (aprox 25 Gb ) was on D drive , unfortunately Head 1 which was fully working has covered only 9Mb out of it and rest by failed Head 0.


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 Post subject: Re: Failed Toshiba Recovery analysis
PostPosted: July 13th, 2018, 3:09 
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Joined: January 12th, 2016, 3:46
Posts: 47
Location: India
This work is closed. Anyone keen to have look at defects patterns and perform R & D through pc3000 , pls. PM. me.
Only option left is to study Head specific Adaptives. which might is responsible for head 0 errors.


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