Data recovery and disk repair questions and discussions related to old-fashioned SATA, SAS, SCSI, IDE, MFM hard drives - any type of storage device that has moving parts
June 15th, 2021, 7:08
Can someone please confirm for me where NVRAM is located on this model? Embedded in MCU?
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June 15th, 2021, 8:39
bottom right
US406C
ROM+NVRAM
June 15th, 2021, 8:47
Judging by the pcb layout, my guess would be botom right near the screw hole.
Rgds
Ahhh, too late
June 15th, 2021, 13:27
LE25FU406B, Sanyo, 4M-bit (512Kx8), 2.3V - 3.6V, Serial Flash Memory:
https://media.digikey.com/pdf/Data%20Sheets/ON%20Semiconductor%20PDFs/LE25FU406B.pdfhttp://semicon.sanyo.com/en/ds_e/ENA1066E.pdfhttp://pdf.datasheetarchive.com/indexerfiles/Datasheets-SW5/DSASW0080400.pdfhttp://www.users.on.net/~fzabkar/Datasheets/DATAURLS.HTMTCV7104FN, Toshiba, buck DC-DC converter, 2.7V - 5.5 Vin, marking V104, SON-8:
https://np.micro-semiconductor.hk/datasheet/07-TCV7104FN(TE85L,F).pdf
June 17th, 2021, 5:57
Drive has a damaged PCB so I've already moved that IC in question to compatible donor PCB. The 8 pin IC bottom right of the PCB pic. Problem is, patient won't spin with donor PCB and patient ROM.
Drive does come DRD DSC and reports correct S/N, but will not spin. Patient with donor PCB and donor ROM does spin, ID's with donor S/N but obviously no LBA access.
Trying to figure out why patient with donor PCB and patient ROM will not spin. Thought perhaps NVRAM was situated elsewhere and wasn't part of ROM IC?
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June 17th, 2021, 11:05
i recall like these were built with 2 different spindle controllers and they are not compatible, so check the numbers on it on both pcbs.
pepe
June 17th, 2021, 17:23
The two different motor controllers appear to be TLS2604 and R42AAJ.
June 18th, 2021, 5:39
Thanks fzabkar and pepe. My first donor PCB did indeed have a different motor controller. Patient was TLS2604 and donor was R42AAJ. Wrote ROM to another donor PCB with matching TLS2604 and case solved. Seems I was trying to overcomplicate this case when it was just a matter of matching PCB properly. Thanks guys.
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June 18th, 2021, 13:33
pepe
June 18th, 2021, 19:56
It might be interesting to compare the donor and patient ROMs to see whether the difference is in the ROM code or the NVRAM.
June 19th, 2021, 6:33
It would be interesting but also a tedious task to find the differences responsible for handling the spindle controller... and what would we do with the info?
It would be more interesting to get a drive read with the other type of pcb, with the donor fw, and this is something less complicated and time consuming.
pepe
June 19th, 2021, 19:13
I was thinking that one could transfer the NVRAM from patient to donor rather than ROM + NVRAM, assuming that the differences were in the ROM code.
June 19th, 2021, 19:30
that doesn't work on its own.
pepe
June 19th, 2021, 19:59
pepe wrote:that doesn't work on its own.
I understand, but PC3K users know how to modify an NVRAM to make it compatible with a donor ROM, do they not?
June 19th, 2021, 20:58
It is not a question of being a PC3k user IMO, some people know, but the most doesn't, probably.
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