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 Post subject: SP SSD S55
PostPosted: July 12th, 2019, 10:55 
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Location: Phoenix, AZ USA
Anyone had experience with these SSD's. Pretty sure its FW as it goes BSY trying to read a sector.

Drive does ID with full volume.
I am able to get it into Safe mode, but as its not supported by PC3000.
IDs as a Seagate, but not sure it is as it has no com port like the other Seagate SSD's.
Controller is SM2258XT, but after Safe mode activated IDs as SM2258SB.


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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 11:14 
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I had one and dumped NAND but looked encrypted. I don't like Silicon Power stuff, always been a pain


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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 11:20 
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Had it few days ago. No solution yet. Ace doesn't know if or when it will be supported.

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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 11:23 
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HaQue wrote:
I had one and dumped NAND but looked encrypted. I don't like Silicon Power stuff, always been a pain

Okay thanks, saves me desoldering it :-)

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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 11:25 
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melvin wrote:
Had it few days ago. No solution yet. Ace doesn't know if or when it will be supported.

Many thanks.

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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 19:46 
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I'm wondering whether the following trick would work for this particular case:

In-circuit recovery of SSDs with "weak" NAND:
http://www.hddoracle.com/viewtopic.php?f=106&t=2740

I could help if someone would be willing to have a go.

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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 19:51 
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fzabkar wrote:
I'm wondering whether the following trick would work for this particular case:

In-circuit recovery of SSDs with "weak" NAND:
http://www.hddoracle.com/viewtopic.php?f=106&t=2740

It is possible. I did see that link on another forum. I will study the post and let you know the findings if the client is prepared to wait.

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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 20:07 
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The good thing about this PCB is that all 3 supply voltages have zero-ohm links between the Vouts and their respective loads. One would only need to identify the NAND supplies (by measuring the voltages at the zero-ohm links), then remove the appropriate link and connect a variable external supply to the load side of the link.

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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 20:51 
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Sounds like this is a perfect candidate. I am out of the office now, but will get back to you once I have done some measuring. Thanks.

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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 21:44 
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I'm wondering whether you could use the variable voltage feature of your flash tool(s) to generate the external voltage for your PCB's single NAND chip. I think there should be no problem with the current draw.

http://blog.acelaboratory.com/wp-content/uploads/2015/10/IMG_5844.jpg

BTW, while researching Ace's adapter, I found this thread:

https://forum.acelaboratory.com/viewtopic.php?t=9419

Whatever you do, don't follow the pinout advice of Roman_TS. I think he had a serious brain fart. :mrgreen:

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 Post subject: Re: SP SSD S55
PostPosted: July 12th, 2019, 21:56 
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I hadn't seen that post before. I know Roman pretty well I will have a word in his ear.

I have a few options for power supply, I have PC3K Flash. VNR and FE readers. I also have a DCPS I use for phones.

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 Post subject: Re: SP SSD S55
PostPosted: July 13th, 2019, 1:45 
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I've just been reading this thread about DRAM-less SSDs:
https://forums.tomshardware.com/threads/dram-cache-ssds.3497845/

popatim wrote:
These drives use a dynamic method of caching the writes which uses the 3D TLC flash in SLC mode. So as long as there is adequate room on the drive, you will have good write performance. Just make sure you leave empty space on the SSD for this and other internal housekeeping tasks (such as garbage collection).

DRAM is only good for large writes and dynamic SLC mostly eliminates the need for it.

The Silicon Power SSD in our thread has a capacity of120GB, yet all my searching suggests that its single NAND flash IC (29F01T2ANCMG2) has a capacity of 192GiB. Normally this would imply that there is a great deal of overprovisioned space. Instead it would appear that much of this extra space may be used as a "dynamic SLC cache" to compensate for the absence of DRAM.

This begs the question, does SLC cache complicate chip-off recoveries?

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 Post subject: Re: SP SSD S55
PostPosted: July 13th, 2019, 5:08 
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Not so much complicate it but at the time it fails you potentially lose more


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