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 Post subject: Samsung SSD 840 PRO no longer being recognized by bios
PostPosted: June 27th, 2020, 4:16 
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Joined: June 27th, 2020, 4:05
Posts: 3
Location: Australia
Hi Guys,

Hope you can help me!

My main desktop PC has two Samsung SSD 840 PRO 256GB (MZ7PD256) running in RAID 0. Today I had a power failure whilst the computer was on and when the power was restored, the computer could no longer boot. Checking the BIOS, I noticed that only one of the 840 PRO's was being detected. I've removed the failed SSD from the computer and tested it with a USB to SATA adapter on another computer but it's still not being detected.

Apart from taking the SSD to a data recovery centre, do I have any other options I could try to get it working again. Is it possible that the firmware could have become corrupt and I could try flashing it similar to the technique in this post -https://forums.tomshardware.com/threads/samsung-850-pro-ssd-corrupted-firmware-fix-read-first.2193040/ ?

Thanks in advance for any assistance you can offer.

Cheers


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 Post subject: Re: Samsung SSD 840 PRO no longer being recognized by bios
PostPosted: June 27th, 2020, 10:19 
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Joined: March 7th, 2009, 12:43
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Location: Angel Data Recovery
If you wanna try that method, save byte-to-byte image first from donor ssd, just in case.

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 Post subject: Re: Samsung SSD 840 PRO no longer being recognized by bios
PostPosted: June 27th, 2020, 22:14 
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Joined: June 27th, 2020, 4:05
Posts: 3
Location: Australia
DR-Kiev wrote:
If you wanna try that method, save byte-to-byte image first from donor ssd, just in case.


Thanks for your reply, DR-Kiev however, I wasn't able to get it to take the firmware when I hot swapped over to the faulty SSD.

Is there any easy way to determine if the SSD is powering on? I'm starting to think that some of the components might have been damaged either when the power went out or came back on. I assume that if I measure 5v around the controller IC then that's going to be the best way of telling?


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 Post subject: Re: Samsung SSD 840 PRO no longer being recognized by bios
PostPosted: June 28th, 2020, 20:29 
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Joined: September 8th, 2009, 18:21
Posts: 12422
Location: Australia
FWIW, the voltage test points for the 840 Evo are in @sourcerer's "Missing Manual":

http://www2.futureware.at/~philipp/ssd/TheMissingManual.pdf

If you need specific help with your Pro SSD, please provide detailed photos of both sides of the PCB.

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 Post subject: Re: Samsung SSD 840 PRO no longer being recognized by bios
PostPosted: July 1st, 2020, 12:53 
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Joined: June 27th, 2020, 4:05
Posts: 3
Location: Australia
fzabkar wrote:
FWIW, the voltage test points for the 840 Evo are in @sourcerer's "Missing Manual":

http://www2.futureware.at/~philipp/ssd/TheMissingManual.pdf

If you need specific help with your Pro SSD, please provide detailed photos of both sides of the PCB.


Thank you, fzabkar. I appreciate any advice you can suggest. Photos of both sides of the PCB are below.

Image

Image


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 Post subject: Re: Samsung SSD 840 PRO no longer being recognized by bios
PostPosted: July 2nd, 2020, 0:57 
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Joined: September 8th, 2009, 18:21
Posts: 12422
Location: Australia
The voltage test points are marked in the attachments.


Attachments:
regs2.jpg
regs2.jpg [ 132.62 KiB | Viewed 214 times ]
regs1.jpg
regs1.jpg [ 106.43 KiB | Viewed 214 times ]

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