All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 18 posts ] 
Author Message
 Post subject: Seagate ROM diagnostics
PostPosted: December 15th, 2018, 7:34 
Offline

Joined: January 12th, 2016, 3:46
Posts: 141
Location: India
Dear friends
I am sharing a critical case which we are unable to solve for several days.
We have got following hard disk in opened condition from one of our customers. -

Disk family -- Seagate Barracuda
Model :-- ST500DM002
P/N - 1BD142-302
Fw :- KC45

We ensured PCB is native . Disk was filled with dust and degradation. We carefully cleaned top surface. There is no visible scratches on top platter even under microscope.
We tried to transplant heads but when powered Read channel is get short. If donor heads put back in donor it works flawlessly.
We tried several donor heads / another PCB as well but there is no change in symptoms.
Now since PCB +heads are working fully only suspectible component is ROM.
Here is rom , can someone pls. check whether it is having any issue. We are unable to find reasons for shorting of read channel.
May be corruption of subroutine in rom is to be blamed.
Those who might have faced similar issue in the past or who have done research on ROM might be able to shade light on the case,
Thank you.
Here is download link --
https://drive.google.com/file/d/1ad6WEr ... sp=sharing


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 20th, 2018, 5:17 
Offline

Joined: January 12th, 2016, 3:46
Posts: 141
Location: India
Cant believe no one has experienced this type of issue before nor anyone has any solution


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 21st, 2018, 4:10 
Offline
User avatar

Joined: March 6th, 2010, 3:46
Posts: 601
Location: Kolding | Denmark
I do not understand what you mean, sorry.

What do you mean here: We tried to transplant heads but when powered Read channel is get short ?
Describe what happens at power on and post full terminal output, the I’m sure you will get some feedback

_________________
Digitalsupport Data Recovery
https://digitalsupport.dk


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 21st, 2018, 9:45 
Offline

Joined: January 12th, 2016, 3:46
Posts: 141
Location: India
Hi digisupport
Thanks for replying. Yes we have changed heads multiple times from different donors (all 100% compatible) but each time when powered read channel is shorted.
If heads put back in donor , it works. We have tried to change new pcb as well. I am bit curious why read channel is shorted may be it is rom corruption.


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 21st, 2018, 10:38 
Offline

Joined: October 5th, 2015, 18:53
Posts: 478
Location: US
How you know it is shorted? Terminal output please.


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 25th, 2018, 8:30 
Offline

Joined: January 12th, 2016, 3:46
Posts: 141
Location: India
Hi drHDD & Friends.
:beer: Merry Christmas to all of you.
Thanks for your help , sorry for delay is replying.
Unfortunately since no solution was in sight and customer become impatient so we returned disk marking it Unrecoverable.
However when we short seagate drives (and if kept for long time ) terminal shows Zzzzzzzzzzzzzzzz type and disk gives DRD DSC a typical response when read channel is shorted. Same symptoms were displayed by this drive so we conclude that read channel might got shorted .
We changed multiple heads / pcb but each time same response was there. If donor heads put back in donor they work fine.
Hope this will give you some clues though they are insufficient.

Thanks again.


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 25th, 2018, 9:18 
Offline
User avatar

Joined: March 6th, 2010, 3:46
Posts: 601
Location: Kolding | Denmark
Full terminal would most likely have pointed out the fault.

_________________
Digitalsupport Data Recovery
https://digitalsupport.dk


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 26th, 2018, 1:09 
Offline

Joined: January 12th, 2016, 3:46
Posts: 141
Location: India
digisupport wrote:
Full terminal would most likely have pointed out the fault.


Hi yes , but unfortunately disk is no more with us so cant send you that , we discussed this case with ace as well. They said its head related issue.


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 27th, 2018, 15:56 
Offline

Joined: October 5th, 2015, 18:53
Posts: 478
Location: US
posidon wrote:
Unfortunately since no solution was in sight and customer become impatient so we returned disk marking it Unrecoverable.

If you have not solution and you don`t know what is going on, why you marked it unrecoverable?


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 27th, 2018, 16:43 
Offline
User avatar

Joined: August 24th, 2012, 8:15
Posts: 139
Location: Dominican Republic
@posidon you should mark it has unable to do it.

_________________
Data Recovery in the Dominican Republic
https://www.recuperamidata.com/


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 28th, 2018, 1:32 
Offline

Joined: January 12th, 2016, 3:46
Posts: 141
Location: India
what is the difference between -- Non recoverable & unable to do it ? Its just different words with same meaning outcome is failure.
If I am unable to recover data then its obviously non recoverable for me , those who can do are free to try and label themselves.
In so many days no one has posted a single opinion or hint which clearly indicates complexity of the case then whats wrong in terming this unrecoverable?
Have you analyzed rom which I have attached whats your diagnosis , if you haven't done any research then I suggest to analyze it first and then post your opinions.


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 28th, 2018, 9:49 
Offline
User avatar

Joined: August 24th, 2012, 8:15
Posts: 139
Location: Dominican Republic
First take a chill pill, second it was just a suggestion, third is not our problem you were unable to do it.

So next time i hope you are able to do it.

Have a nice day :)

posidon wrote:
what is the difference between -- Non recoverable & unable to do it ? Its just different words with same meaning outcome is failure.
If I am unable to recover data then its obviously non recoverable for me , those who can do are free to try and label themselves.
In so many days no one has posted a single opinion or hint which clearly indicates complexity of the case then whats wrong in terming this unrecoverable?
Have you analyzed rom which I have attached whats your diagnosis , if you haven't done any research then I suggest to analyze it first and then post your opinions.

_________________
Data Recovery in the Dominican Republic
https://www.recuperamidata.com/


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 28th, 2018, 16:07 
Offline

Joined: November 29th, 2006, 10:08
Posts: 7843
Location: UK
Spildit wrote:
I would mark a drive as un-recoverbale if the platters are damaged like this, etc ...

http://www.hddoracle.com/viewtopic.php?f=2&t=2521

Otherwise i would be honest and i would tell the client that i'm not able to recover the data and would advice to go to a better data recovery house.

Let's say that i do have a very simple case that i can't fix like for example write a ROM file on a WD PCB i wouldn't tell the client that the drive is un-recoverable and "kill" the hopes for the client to have the data recovered knowing that any other data recovery firm would recover that very fast and in a easy way....

If the client do believe that it's un-recoverable he might not try another data recovery firm even more if you did charge for diagnostic (he might not want to pay again to other people to have the same answer).

If you say that you can't see what is going on or that you don't do firmware work or head stack replacement or whatever but there are people more specialized that can do that and if you reference the client to those people you will look like way more honest and no-one will loose as the client will have better chance with someone more competent,

Know your limitations and be honest, just that.


I have to agree, there’s a huge difference between “declared unrecoverable” and “I can’t recover this”

_________________
PC Image Data Recovery
http://www.pcimage.co.uk

New!! HDD-PCB.COM for all your PCB and donor HDD requirements!


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 29th, 2018, 2:30 
Offline

Joined: October 5th, 2015, 18:53
Posts: 478
Location: US
posidon wrote:
However when we short seagate drives (and if kept for long time ) terminal shows Zzzzzzzzzzzzzzzz type and disk gives DRD DSC a typical response when read channel is shorted. Same symptoms were displayed by this drive so we conclude that read channel might got shorted .

Drive show this message not because read channel is shorted. And this your case is perfect example of it.


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 29th, 2018, 7:44 
Offline

Joined: January 12th, 2016, 3:46
Posts: 141
Location: India
I think besides platter damage there are so many cases which are perfectly "Unrecoverable "

Those who disagree erase / overwrite rom of any latest seagate hard disk or hardware encryption from WD my passport and then do whatever R & D to recover data. There is hair thin line between I cannot recover & non recoverable ( No one can recover) .
Why to take a rom , a simple logical case where disk is overwritten by new Data /OS is impossible to recover (certain data type).
Data recovery always works under strict scientific and technical limitations.
what Ontrack videos where for several cases they are shown chances of recovery 0 %
You might become no.1 data recovery company in the world if you could achieve this feat (may be you can beat warren buffet too)


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 29th, 2018, 12:35 
Offline
User avatar

Joined: October 21st, 2014, 1:39
Posts: 131
Location: Ellijay, GA
Spildit wrote:
Well maybe i should design a time machine and then i can recover 100% of the cases.
But then you risk altering the future, when you return with the data the customer never shows up because they didn't lose their data this time :)

_________________
Blizzard Data Recovery


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 29th, 2018, 21:16 
Offline
User avatar

Joined: August 24th, 2012, 8:15
Posts: 139
Location: Dominican Republic
:lol: good one.

Blizzard wrote:
Spildit wrote:
Well maybe i should design a time machine and then i can recover 100% of the cases.
But then you risk altering the future, when you return with the data the customer never shows up because they didn't lose their data this time :)

_________________
Data Recovery in the Dominican Republic
https://www.recuperamidata.com/


Top
 Profile  
 
 Post subject: Re: Seagate ROM diagnostics
PostPosted: December 30th, 2018, 8:41 
Offline

Joined: January 12th, 2016, 3:46
Posts: 141
Location: India
Spildit wrote:
Well maybe i should design a time machine and then i can recover 100% of the cases.


Nice Solution Spildit , just align onboard zap in the past , get all data come back. Great innovation. :D

Wishing all of you guys a Very Warm , Joyous and Prosperous 2019 in advance.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 18 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: Google [Bot] and 62 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group