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inflex
 Post subject: 16GB Lexar MicroSD card filling some image files with 0's
PostPosted: August 27th, 2013, 22:45 
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*** I don't know if this is an Android / Galaxy S3 fault, or a fault in the microSD card ***

Client brings a microSD card to me, some pictures are fine, others are showing up as invalid/broken. Barely 2GB used.

I made a ddrescue clone of the microSD card and proceeded to check...

- the corrupted/dead JPEG files are just filled with zero bytes, but the file sizes are correct.

Is it possible that there's an issue with the flash controller causing it to map the wrong sectors, or a corrupted mapping?

For now I've told the client that they should essentially prepare for the worst.

Ideas?

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HaQue
 Post subject: Re: 16GB Lexar MicroSD card filling some image files with 0'
PostPosted: August 28th, 2013, 0:05 
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It could be the controller, or it could be the FAT or FTL Table on the card, or it could actually be overwritten. Same type of DR as the Lexar thread would be advised. Reading the NAND directly is probably only going to tell. A DR company that does flash should be able to handle the MicroSD.
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inflex
 Post subject: Re: 16GB Lexar MicroSD card filling some image files with 0'
PostPosted: August 28th, 2013, 0:09 
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HaQue wrote:
It could be the controller, or it could be the FAT or FTL Table on the card, or it could actually be overwritten. Same type of DR as the Lexar thread would be advised. Reading the NAND directly is probably only going to tell. A DR company that does flash should be able to handle the MicroSD.


Can you give me a suitable DR company perhaps to send it to?

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HaQue
 Post subject: Re: 16GB Lexar MicroSD card filling some image files with 0'
PostPosted: August 28th, 2013, 0:15 
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Actually I dont personally know of any that I know does flash, and does them properly, at a NAND level. I have seen alot of advertising for Flash DR but they only do basically what you already do. Nothing wrong with that of course, because as you know, alot of recoveries are logical or soldering. Just makes it hard to know who really does the bare bones recovery from NAND.
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inflex
 Post subject: Re: 16GB Lexar MicroSD card filling some image files with 0'
PostPosted: August 28th, 2013, 0:25 
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HaQue wrote:
I have seen alot of advertising for Flash DR but they only do basically what you already do. Nothing wrong with that of course, because as you know, alot of recoveries are logical or soldering. Just makes it hard to know who really does the bare bones recovery from NAND.


That's a shame, I was thinking the same thing when I was looking around.

Maybe next year when I get the new office + clean room (for HDD work) I can look at also picking up more NAND flash orientated DR gear as well.

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HaQue
 Post subject: Re: 16GB Lexar MicroSD card filling some image files with 0'
PostPosted: August 28th, 2013, 0:50 
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If there are any DR companies in AU that do proper recoveries at a NAND level and can show that.. Now would be a good time to holler :-)
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networkpc3000
 Post subject: Re: 16GB Lexar MicroSD card filling some image files with 0'
PostPosted: August 30th, 2013, 19:31 
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I meet such problem two time. 1,customer case. 8GB kingston 2,myself HTC IS may be 16GB sandisk or kingston. Both bad section :wink:

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HaQue
 Post subject: Re: 16GB Lexar MicroSD card filling some image files with 0'
PostPosted: August 31st, 2013, 7:09 
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inflex wrote:
HaQue wrote:
It could be the controller, or it could be the FAT or FTL Table on the card, or it could actually be overwritten. Same type of DR as the Lexar thread would be advised. Reading the NAND directly is probably only going to tell. A DR company that does flash should be able to handle the MicroSD.


Can you give me a suitable DR company perhaps to send it to?


3 companies that I have seen that look like they do it, and first 2 can possibly can talk to you about it on this forum:

http://www.odzyskiwanie-danych.com.pl/ - Username Arvika
http://www.rflashdata.com/monolith/ - Username networkpc3000
http://www.flash-extractor.com/services/ Soft Center in Russia

The only pricing I have seen is SC at Monolith data recovery 1300$, 1 month turnaround
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