All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 56 posts ]  Go to page Previous  1, 2, 3
Author Message
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: November 27th, 2019, 11:50 
Offline

Joined: July 30th, 2012, 3:37
Posts: 282
Location: Fairfield, CT USA
fzabkar wrote:
jeremyb wrote:
BTW, it is possible for a bit to be stuck when reading the bus but not when writing to it. That's because different gates are involved, and each gate is separately enabled.


How is it possible to have a stuck bit when reading from the NAND bus, forget about the obvious not being able to accept commands, the translator table stored in the controller would be impossible to decipher by the controller. It wouldn't be able to read its firmware or boot up.

I should be getting the package Friday, everything is speculation till then.

_________________
Recover My Flash Drive


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: November 27th, 2019, 14:52 
Offline
User avatar

Joined: September 8th, 2009, 18:21
Posts: 12001
Location: Australia
A stuck bit on a bus need not manifest itself in the same way when reading and writing. That's because two different gates are involved. The problem could be in the read gate.

Clearly the NAND must be OK. Either the data are correctable via ECC, or the sector is reported as uncorrectable. The problem is elsewhere, as I have suggested earlier.

Code:
              /Wrt Enable
                |
                |
               |o
   Write  >----| >O---.
               |/     |
                      |
Data bit #n           +----> Bus bit #n
                      |
                /|    |
     Read <---O< |----'
                o|
                |
                |
              /Rd Enable

_________________
A backup a day keeps DR away.


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: November 28th, 2019, 18:47 
Offline
User avatar

Joined: December 4th, 2012, 1:35
Posts: 3432
Location: Adelaide, Australia
@JB : I don't know if you ever used the SD Card reader with the .dll in FE but I have used it a few times getting a good image. If nothing else, the output log may be interesting in the FE interface. I don't have the proper FE adapter but just wired it up.


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 2nd, 2019, 18:24 
Offline

Joined: July 30th, 2012, 3:37
Posts: 282
Location: Fairfield, CT USA
It's a 16GB Transcend CF Card NOT A FREAKING SD CARD!!!

Seems like a standard data recovery job to me unless I'm getting trolled... I'll validate the data with the client and follow up :-)

_________________
Recover My Flash Drive


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 2nd, 2019, 22:52 
Offline

Joined: July 30th, 2012, 3:37
Posts: 282
Location: Fairfield, CT USA
There is 10GB of good data and the rest is corrupt, if I had to "guess" its a firmware issue w/ the camera, the CF card itself appears to be fine to me.
ECC is green in the areas where corrupt headers are seen and the card is fully functional.

:-\

_________________
Recover My Flash Drive


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 2nd, 2019, 23:21 
Offline

Joined: July 30th, 2012, 3:37
Posts: 282
Location: Fairfield, CT USA
jeremyb wrote:
There is 10GB of good data and the rest is corrupt, if I had to "guess" its a firmware issue w/ the camera, the CF card itself appears to be fine to me.
ECC is green in the areas where corrupt headers are seen and the card is fully functional.

:-\


In case anyone wants to follow along at home they can download a sample of the headers below..

I don't "think" its recoverable, it looks like every a 16bit word where one of the bits is stuck off, not inverted.

eg: 0x00 is always 0x00 but 0x6F will be 0x6B

0000 0000
0000 0000
vs
0110 1111
0110 1011


Attachments:
CF16GB.zip [1.3 KiB]
Downloaded 14 times

_________________
Recover My Flash Drive
Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 3rd, 2019, 1:32 
Offline

Joined: March 4th, 2019, 8:33
Posts: 70
ddrecovery wrote:
I just had a PM from a friend who is too shy to post on this forum......

He had a case where two data lines were shorted (D8 and D9) resulting in a very similar issue to this. I guess if it is every 6th bit which is flipped it would be possible to write a script to revert them.

@jeremyb check for shorted data lines


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 3rd, 2019, 3:29 
Offline

Joined: July 30th, 2012, 3:37
Posts: 282
Location: Fairfield, CT USA
HaspHL wrote:
ddrecovery wrote:
I just had a PM from a friend who is too shy to post on this forum......

He had a case where two data lines were shorted (D8 and D9) resulting in a very similar issue to this. I guess if it is every 6th bit which is flipped it would be possible to write a script to revert them.

@jeremyb check for shorted data lines


That statement makes no sense.. what shorted data lines.. ("use the force Luke")

1. The NAND chips are fine.. The ECC passes so the data in the chips are fine, I can reassemble the physical image and validate it against the logical image, there is no difference so it's not an interface, controller or NAND issue w/ the CF card. The data was written to the card corrupted, to me the issue is with the Camera.

2. Its not an inverted bit, its a stuck bit, the bit is shorted to ground, it is ALWAYS zero you can't write a script to fix that because there is no operation to decode it..

3. The camera has a years worth of photos on it, only the most recent photos are corrupt.

_________________
Recover My Flash Drive


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 3rd, 2019, 5:38 
Offline

Joined: May 13th, 2019, 7:50
Posts: 70
Location: Nederland
Can you post header good file start up last instance of FF DA + 20 more bytes.

_________________
www.disktuna.com - photo repair service


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 3rd, 2019, 11:00 
Offline

Joined: May 13th, 2019, 7:50
Posts: 70
Location: Nederland
This is hardly a sentence. I meant to ask: Can you post a header of a good file from start till last instance of FF DA + 20 more bytes.

_________________
www.disktuna.com - photo repair service


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 3rd, 2019, 14:54 
Offline
User avatar

Joined: September 8th, 2009, 18:21
Posts: 12001
Location: Australia
What puzzles me is why the file system metadata are not corrupt. Are there any strange file names or date/time stamps?

_________________
A backup a day keeps DR away.


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 3rd, 2019, 15:14 
Offline
User avatar

Joined: September 8th, 2009, 18:21
Posts: 12001
Location: Australia
If the file system is FAT, wouldn't CHKDSK (in readonly mode) expect to find cross-linked files or other corruption?

_________________
A backup a day keeps DR away.


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 3rd, 2019, 19:53 
Offline

Joined: July 30th, 2012, 3:37
Posts: 282
Location: Fairfield, CT USA
fzabkar wrote:
What puzzles me is why the file system metadata are not corrupt. Are there any strange file names or date/time stamps?

fzabkar wrote:
If the file system is FAT, wouldn't CHKDSK (in readonly mode) expect to find cross-linked files or other corruption?


There is nothing physically wrong with the CF card, file system, or 80% of the data on the card.
It's a deleted file recovery.. 20% of the deleted files have a stuck bit with a value of 0 every 16bit word at bit 2

eg:

Code:
org: 1111 1111 0110 1111
mod: 1111 1111 0110 1011

In my opinion the Cameras firmware wrote corrupt data to the card.. perhaps a MOVSW instruction from corrupt DRAM?
As the value is stuck at zero no mater what the original value the damage is irreversible, its not an inverted bit.

_________________
Recover My Flash Drive


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 8th, 2019, 9:30 
Offline

Joined: May 13th, 2019, 7:50
Posts: 70
Location: Nederland
So, no go?

_________________
www.disktuna.com - photo repair service


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 8th, 2019, 17:48 
Offline

Joined: July 30th, 2012, 3:37
Posts: 282
Location: Fairfield, CT USA
Arch Stanton wrote:
So, no go?

I don't see any way to move forward, so yes..

BTW, Carrie Miko, did they get back to you? It looks like the jpeg header is missing, not that the files are encrypted. The EOF marker is present on the jpegs.

_________________
Recover My Flash Drive


Top
 Profile  
 
 Post subject: Re: Help! need to refer someone for SDcard in dominican repu
PostPosted: December 8th, 2019, 18:04 
Offline

Joined: May 13th, 2019, 7:50
Posts: 70
Location: Nederland
Carrie, was that name of customer? They used so many different email addresses with different names. Quite difficult too communicate with. For one, even after several requests she never sent me a reference file because "she didn't have one".

But as you have recovered files she now should have right? Feel free to send me some corrupt / headerless + a few reference files (joep@disktuna.com). If she agrees to that.

_________________
www.disktuna.com - photo repair service


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 56 posts ]  Go to page Previous  1, 2, 3

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: Google [Bot] and 3 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