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CompactFlash, SD, MMC, USB flash storage. Anything that does not have moving parts inside.
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Re: SanDisk X100 256G no BIOS detection

February 13th, 2015, 21:39

fzabkar wrote:As for C168, I would measure the resistance between ground and each of the pins of a single NAND. Then consult the NAND pinout and determine which, if any, of the grounded pins is not actually a power ground.


This NAND pins are grounded:
2 - 13 - 23 - 25 - 27 - 33 - 36 - 40 - 46 -48

Re: SanDisk X100 256G no BIOS detection

February 13th, 2015, 22:14

ISTM that your NAND array must be powered from both the 3.3V and 1.8V supplies. The Vcc supply (3.3V) would power the logic and the NAND cells, while the VccQ (1.8V) supply would power the I/O section.

Capacitor C168 would provide local bypassing of the VccQ supply for all NANDs. However, if the NAND chips follow the ONFI 2.2 spec, then we would expect that pins 34 and 39 would be connected together. :?

http://www.onfi.org/~/media/onfi/specs/ ... .pdf?la=en

That said, your latest measurements would suggest that C168 is no longer shorted. Are you certain that your original measurement was correct? :?
Attachments
ONFI_2-2_pinout.jpg

Re: SanDisk X100 256G no BIOS detection

February 13th, 2015, 22:45

fzabkar wrote:Capacitor C168 would provide local bypassing of the VccQ supply for all NANDs. However, if the NAND chips follow the ONFI 2.2 spec, then we would expect that pins 34 and 39 would be connected together. :?

That said, your latest measurements would suggest that C168 is no longer shorted. Are you certain that your original measurement was correct? :?


Yes i'm sure that pin 34 and 39 are not connected together.
C168 is still shorted.

Re: SanDisk X100 256G no BIOS detection

February 14th, 2015, 1:38

Sorry, I can't understand the function of C168, nor can I suggest a suitable replacement. :-( It might be interesting to see if the short persists after removing the capacitor.

Re: SanDisk X100 256G no BIOS detection

February 14th, 2015, 9:54

I removed C168, short persist :(

Re: SanDisk X100 256G no BIOS detection

February 14th, 2015, 11:56

Does anybody of you know how to JTAG this SSD so that i will be able to see terminal log?

JTAG TRACER.JPG
JTAG RDT.JPG
JTAG RDT.JPG (9.43 KiB) Viewed 6974 times

Re: SanDisk X100 256G no BIOS detection

February 14th, 2015, 21:54

I can't tell if C145 is populated. If not then JTAG probably disabled by removed components, probably some resistors elsewhere. Then JTAG might be disabled in the system as well. Usually companies like Sandforce don't leave JTAG open at the front door.
JTAG and Terminal log are 2 separate things. Terminal Log is from the serial port. I would be interested to see just what is available on the JTAG Port though.

RDT stands for a number of things.. one is "Remote Distributed Testing" and Sandisk would have some software custom for this.
or it could be based on something like this:
JTAG, Ethernet, etc.; in SHAPES jargon, this tile configuration
is called RISC+DSP+DNP Tile (RDT)
which could be more likely.
http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=50&ved=0CLUCEBYwMQ&url=http%3A%2F%2Farxiv.org%2Fpdf%2F1203.1536&ei=cfnfVNW_MsSF8gX-3YJI&usg=AFQjCNETSf1r2ZC45XKMblIkGp_oIkIEaA&sig2=oz3DvuW9BmcWMV6hX0AR9A
I have a JTAGulator which would be very good for quickly figuring out the layout/operability of the JTAG port.

Could you please post pictures of the front and back of case so I can try and buy the same SSD and do some testing?

Re: SanDisk X100 256G no BIOS detection

February 16th, 2015, 10:23

Hi HaQue, thank you for your help.
C145 is populated, C145 tracks are connected to a NAND chip.

Here the pics you asked:
front.JPG

back.JPG

Re: SanDisk X100 256G no BIOS detection

March 2nd, 2015, 20:26

"Just back up your data and there is no problem"
The whole existence of this forum pretty much assumes this advice has already been ignored.

While a philosophical look at encryption might be interesting, it does not in any way address recovering DATA from these devices.. which is what we are trying to do.

Another point, suppose you did have the Key? then what? has anyone figured out steps to use a key to recover customer DATA?

There are problems that can be fixed to recover DATA such as electrical issues.

While I don't disagree with you, I think your post doesn't address the issues of OP and others with similar cases, and is a little off topic.

Re: SanDisk X100 256G no BIOS detection

January 20th, 2018, 8:41

michael chiklis wrote:Does anybody of you know how to JTAG this SSD so that i will be able to see terminal log?
JTAG TRACER.JPG


Old post I know, but it appears the JTAGOTRACER pads may sport a Mictor connector :
http://www.malwaretech.com/2015/04/hard-disk-firmware-hacking-part-3.html

Re: SanDisk X100 256G no BIOS detection

May 4th, 2018, 4:09

Have you finally solved the ssd repair? Because I have an identical ssd, dead , and I'm sure it can be brought to life somehow.

Re: SanDisk X100 256G no BIOS detection

May 4th, 2018, 4:35

@alindumitru46, can you provide better photos of both sides of the PCB?

Re: SanDisk X100 256G no BIOS detection

May 7th, 2018, 13:10

Of course, in the last days I was very busy. Now I'll test the option to edit the post ;)

Re: SanDisk X100 256G no BIOS detection

May 8th, 2018, 6:05

These are the best pictures I can make.
Attachments
P1040202.JPG
P1040201.JPG

Re: SanDisk X100 256G no BIOS detection

May 8th, 2018, 6:55

These are the best pictures I can make.
The short story: I purchased 4 Sandisk X100 SSD with a "strange" SMART issue 5 years ago . Only 1 died, after 1 month, the others 3 pcs run fine with max performances in 2 laptops and 1 NUC.
After running for about 1 month, the next day he was not recognized in the BIOS, then by any motherboard I checked.

Re: SanDisk X100 256G no BIOS detection

May 9th, 2018, 14:56

pcimage wrote:What do the ATA status registers show? (DRDY? Or BSY? Or nothing?)

Can use MHDD or Victoria.

Re: SanDisk X100 256G no BIOS detection

May 9th, 2018, 16:17

Can you measure the voltages at V1, V2 and V3?


88PG877, Marvell, Field Programmable DSP Switcher, 1 MHz, 7.5A Step-Down Regulator, marking G77, QFN-18, Vin = 3V - 5.5V, Vout = 0.72V - 3.63V:
http://www.marvell.com.cn/selector_guide/downloads/ds/88pg8x7.pdf

ADT7302, Analog Devices, +/-2degC Accurate, Micropower Digital Temperature Sensor, marking T02:
http://www.analog.com/media/en/technical-documentation/data-sheets/ADT7302.pdf

TPS62590, Texas Instruments, 1A, 2.5V to 5.5V, Step Down Converter, 2.25-MHz, marking OAL:
http://www.ti.com/lit/ds/symlink/tps62590.pdf
Attachments
V1.jpg
V2.jpg
V3.jpg
TVS_MOSFET_DEVSLP.jpg
DEVSLP.jpg

Re: SanDisk X100 256G no BIOS detection

May 10th, 2018, 3:52

I just finished measuring the voltages at those points, according to the scheme, using a no-name PSU and a UNI-T UT139B digital multimeter.
[URL=http://www.imagebam.com/image/287e99855409024]

Re: SanDisk X100 256G no BIOS detection

May 10th, 2018, 5:33

Image

Most of those voltages don't make sense. Are you using an appropriate PCB ground reference?? Does your meter have a weak battery??

Re: SanDisk X100 256G no BIOS detection

May 10th, 2018, 6:54

I used the pcb ground :idea:
I'll try right now with ground from power connector
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