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read memory chips of a ssd drive
http://forum.hddguru.com/viewtopic.php?f=10&t=31859		 Page 1 of 1
Author:  gianni [ August 28th, 2015, 10:26 ]
Post subject:  read memory chips of a ssd drive
I've got a broken samsung 840 evo 512 GB ssd.

If everything else fails ( viewtopic.php?f=10&t=31458&start=20 ) I would like to desolder the ssd and then try to use this nand reader

TNM5000 Universal Programmer

www.tnmelectronics.com/English/5000.html

Any hint if this could work?

Does the 840 evo have only one 512 gb nand or are there more than one? In this case, could a file file possibly be written to tow different nands?

thanks
Author:  labtech [ August 28th, 2015, 17:37 ]
Post subject:  Re: read memory chips of a ssd drive
The data is encrypted. So, does not make sense to remove the NANDs.
Author:  HaQue [ August 28th, 2015, 18:50 ]
Post subject:  Re: read memory chips of a ssd drive
I couldn't find anywhere in a quick search that the Samsung MEX S4LN045X01-803 is encrypted
Author:  labtech [ August 28th, 2015, 20:06 ]
Post subject:  Re: read memory chips of a ssd drive
Maybe I am wrong... Here is a reference: http://www.samsung.com/global/business/ ... per06.html
Author:  HaQue [ August 28th, 2015, 21:29 ]
Post subject:  Re: read memory chips of a ssd drive
No, from the way I read it, you are right.

Quote:
AES encryption is always active on an 840 or 840 Pro Series SSD. In order to benefit from the encryption feature, however, the user must enable an ATA password to limit access to the data.


so they could either need a password or not for data access, but looks like data is encrypted on the nands no matter what.

I wonder if customers understand that if anything goes wrong, they are screwed for getting data back.

But hey, all the data you backed up as advised and have now lost... the "bad guys" cant get it either.. Yay!
Author:  fzabkar [ August 28th, 2015, 23:31 ]
Post subject:  Re: read memory chips of a ssd drive
gianni wrote:
I've got a broken samsung 840 evo 512 GB ssd.

If you have a multimeter, I can help with measurements.
Author:  thatdellguy [ August 29th, 2015, 0:48 ]
Post subject:  Re: read memory chips of a ssd drive
HaQue wrote:
I wonder if customers understand that if anything goes wrong, they are screwed for getting data back.

We need an SSD drive that takes a selfie when the customer finds out the cost of SSD data recovery or that their data is lost forever.
Author:  gianni [ August 29th, 2015, 16:13 ]
Post subject:  Re: read memory chips of a ssd drive
HaQue wrote:
No, from the way I read it, you are right.

Quote:
AES encryption is always active on an 840 or 840 Pro Series SSD. In order to benefit from the encryption feature, however, the user must enable an ATA password to limit access to the data.


so they could either need a password or not for data access, but looks like data is encrypted on the nands no matter what.

I wonder if customers understand that if anything goes wrong, they are screwed for getting data back.

But hey, all the data you backed up as advised and have now lost... the "bad guys" cant get it either.. Yay!


What does it mean that encryption is always active? It makes no sense... Does it possibly mean that the firmware module for encryption is loaded anyway, but the data if not encrypted? Or that they use a default password? But why would the do it. This seems a nightmare...
Author:  gianni [ August 29th, 2015, 16:17 ]
Post subject:  Re: read memory chips of a ssd drive
fzabkar wrote:
gianni wrote:
I've got a broken samsung 840 evo 512 GB ssd.

If you have a multimeter, I can help with measurements.


Thank you for your kind offer, I did bring the drive to an electronic shop, where they'll try to replace the e4fs component (it's what I suggested to them, b they have no clue. If you can tell me what to measure, I would greatly appreciate it
Author:  fzabkar [ August 29th, 2015, 20:05 ]
Post subject:  Re: read memory chips of a ssd drive
Why did you suggest the e-fuse? Is it visibly damaged? Did you test it?

If you would like me to help you, then upload detailed photos or scans of both sides of the PCB.
Author:  HaQue [ August 29th, 2015, 22:23 ]
Post subject:  Re: read memory chips of a ssd drive
gianni wrote:
What does it mean that encryption is always active? It makes no sense... Does it possibly mean that the firmware module for encryption is loaded anyway, but the data if not encrypted? Or that they use a default password? But why would the do it. This seems a nightmare...


nightmare for data recovery, yes, but makes perfect sense for almost everything else.

Think of data scientists that must figure out the best algorithms for data storage. They don't know what type of data the user will store. Video compresses different than text. so how about if no matter what, the data pretty much would need to be stored on the NAND in a known format (encrypted). now they can figure out best way, write their algorithms.

Secure wipe is a piece of cake - just clear one password and the data is virtually inaccessible.

I have never bothered to look into the actual implementation of this exactly, as breaking AES schemes seems like a bit of a drag. But this is how I imaging it roughly is:
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