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 Post subject: 3.5" Toshiba's
PostPosted: July 20th, 2015, 11:27 
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So I just got in my first real live 3.5" Toshiba drive for data recovery. Model is MD04ACA400 which doesn't appear to be supported in PC-3000 even in the latest version. I'm thinking it's either bad heads or G-list damage from the way it's acting, but hard to really know for sure at this point.

Anyone worked on these much yet? I'm assuming that the part number is the place to look for matching parts like the read/write heads and they seem to be available. Even the PCB is quite foreign. No IC602 to speak of, but four similar looking ones labeled IC9-IC12. Anyone know which one(s) contain the configuration pages?

Any help is appreciated, this job is a rush so any input that can cut down my R&D will be a big help.

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 Post subject: Re: 3.5" Toshiba's
PostPosted: July 20th, 2015, 11:35 
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I'm thinking IC10 is the one to transfer if I want to try another PCB, what do you guys think?

I posted a picture here: https://www.data-medics.com/forum/downl ... &mode=view

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 Post subject: Re: 3.5" Toshiba's
PostPosted: July 20th, 2015, 12:08 
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It would be IC10, I think.


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 Post subject: Re: 3.5" Toshiba's
PostPosted: July 20th, 2015, 12:28 
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Update: Solved the case. It was G-List damage as I suspected. Drive has a fair number of bad sectors, but it's imaging away nicely now.

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 Post subject: Re: 3.5" Toshiba's
PostPosted: July 20th, 2015, 13:17 
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Well done.

Nice job :)


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 Post subject: Re: 3.5" Toshiba's
PostPosted: July 20th, 2015, 17:08 
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For reference ...

W25Q80BL, Winbond, 8M-bit 2.5V Serial Flash Memory with uniform 4KB sectors and Dual/Quad SPI:
https://www.winbond.com/resource-files/ ... 80blf1.pdf

LE25U81AQE, ON Semiconductor (Sanyo?), 8Mbit, 2.5V, serial SPI flash memory, VSON8T package:
http://www.onsemi.cn/pub_link/Collateral/ENA2199-D.PDF

The LC138 chip (74LC138) is a 3-to-8 Line Decoder / Demultiplexer which enables the MCU to select 1 of the 4 flash memory chips.

It's interesting that the PCB contains 4MBytes of nonvolatile memory. Seems like a lot. I wonder what functionality has been added over previous models.

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 Post subject: Re: 3.5" Toshiba's
PostPosted: July 20th, 2015, 18:15 
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Unfortunately I was only able to get 70% of the data before a bad sector crashed it out and now I can't even get it to clear the G-list again....Grrrr!!! I may be at the mercy of Ace Labs to come out with an update to support this model so I can build a software translator...

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 Post subject: Re: 3.5" Toshiba's
PostPosted: July 21st, 2015, 2:16 
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The order of the 4 flash memories in the MCU's address space, from low to high, appears to be IC12, IC11, IC9, IC10.

It might sound far fetched, but I wonder if the three LE25U81AQE chips might contain those firmware modules that would normally be written to the SA. If so, then that's where you might find the G-list.

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 Post subject: Re: 3.5" Toshiba's
PostPosted: July 21st, 2015, 9:27 
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I'm pretty sure the G-list is on the platters by the way it's clicking on startup. Was able to clear the G-list at first and get sector access (could hear it grinding away clearing it). But, now it won't do it again.

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 Post subject: Re: 3.5" Toshiba's
PostPosted: July 21st, 2015, 13:55 
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fzabkar wrote:
The order of the 4 flash memories in the MCU's address space, from low to high, appears to be IC12, IC11, IC9, IC10.

Oops, I think I reversed the order. I believe the correct order, from low to high, should be IC10, IC9, IC11, IC12.

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 Post subject: Re: 3.5" Toshiba's
PostPosted: January 4th, 2017, 11:18 
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Hi all, my MD04 was damaged accidently by using an incorrect power module cable. A small black square boom...

As show in the picture, anyone could tell me what is this? Mark on it is "63AN 78", hope I can fix it. An Inductor I guess?

Thanks in advance.


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 Post subject: Re: 3.5" Toshiba's
PostPosted: January 4th, 2017, 11:29 
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And one more question...

If I replace IC10 to another hdd with same model, can it work?


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 Post subject: Re: 3.5" Toshiba's
PostPosted: January 23rd, 2017, 17:26 
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Did you check the TVS diodes? One or both will probably be shorted. This will tell us whether the damage was done via the +5V or +12V input or both.

As for the mystery component, it appears to have 4 pins, one of which is switched by the adjacent transistor (?). I'm guessing that the component is a power switch. It would help if you could identify the 3 pins with the heavier traces - Ground, +5V or +12V, Vout?


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 Post subject: Re: 3.5" Toshiba's
PostPosted: January 25th, 2018, 4:21 
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Update:

The part which I thought was a 5V TVS diode (marking "72") appears to be an ordinary 20V, 1A Schottky barrier diode. Therefore, it provides no overvoltage protection. The "XB" part appears to be a 15V, 1W zener diode, not a TVS diode.

RB160M-20, ROHM, 20V, 1A, Schottky barrier diode, marking 72, SOD-123/1206:
http://www.smdmark.com/en-US/smd-model-RB160M.html

http://docs-asia.electrocomponents.com/webdocs/13e4/0900766b813e45a3.pdf (RB160M-30, marking 73)

http://rohmfs.rohm.com/en/products/databook/datasheet-nrnd/discrete/diode/schottky_barrier/rb160m-40.pdf (RB160M-40, marking 74)

https://www.buerklin.com/medias/sys_master/download/download/h72/h2d/8891259879454/technical-data-sheet-rohm-semiconductor-rb160m-60tr-en-20160314.pdf (RB160M-60, marking 76)

KDZTF-15B, Rohm, 15V, 1W Zener diode, marking XB:
http://rohmfs.rohm.com/en/products/databook/datasheet-nrnd/discrete/diode/zener/kdztftr9.1b-e.pdf

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 Post subject: Re: 3.5" Toshiba's
PostPosted: January 25th, 2018, 4:38 
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The "small black square" looks like a power switch or maybe an LDO regulator. Its "control" pin is most likely an Enable input. This pin is driven by the digital transistor, which in turn would be switched by digital logic, possibly the MCU.

DTC123J, Rohm, NPN digital transistor, 50V, 100mA, marking E42:
http://www.rohm.com/web/global/datasheet/DTC123JEB/dtc123jebtl-e


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 Post subject: Re: 3.5" Toshiba's
PostPosted: January 25th, 2018, 15:09 
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Thanks for the update !

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 Post subject: Re: 3.5" Toshiba's
PostPosted: January 26th, 2018, 4:32 
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The mystery IC is a TPS22912C.

TPS22912C, Texas Instruments, Ultra-small, Low On Resistance Load Switch With Controlled Turn-on, Vin = 1.4V - 5.5V, 2A, 60mohm ON-resistance, marking 78:
http://www.ti.com/lit/ds/symlink/tps22913.pdf

More info in the following thread:
viewtopic.php?f=1&t=36343

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 Post subject: Re: 3.5" Toshiba's
PostPosted: January 27th, 2018, 4:23 
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data-medics wrote:

Your picture is now corrupt. I could upload it here, if that's OK?

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 Post subject: Re: 3.5" Toshiba's
PostPosted: August 15th, 2018, 20:23 
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Full sized photo:
http://forum.hddguru.com/download/file.php?id=16457&mode=view

Other ICs:

TPS27081ADDCR, Texas Instruments, PFET High Side Load Switch w/ Level Shift & Adj Slew Rate Control, 1.2V - 8V, 3A, marking AUA, DFN6:
http://www.ti.com/lit/ds/symlink/tps27081a.pdf

BD91364BMUU, Rohm, 2.9V - 5.5V, 5A, Integrated MOSFET Buck Converter, QFN-20:
http://www.rohm.com/web/global/datasheet/BD91364BMUU/bd91364bmuu-e

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