Hey all,

So I have this Hitachi drive that I cannot get working and can't lose the data.

At first it wouldn't spin up so I swapped the board with an identical drive and was able to get it to spin up, but nothing can see it.

I've found a post here that solved a similiar issue, the resolution was to cut out the 5 and 10 volt diode with the old board back on it's drive. My problem with this is I believe my diodes are testing good.

Both boards:
12v - 200 then reverse - 1 (infinite)
5v - 485 then reverse - 1 (infinite)

the post that I'm referring to is hitachi-750gb-suspect-pcb-problem-t18942.html

If you swap board swap out adaptive. A simple board swap will not work. Move your NVRAM to the new board. A lot of Hitachi that I have had come in here with the motor controler chip bad on them

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Iorana Haraharaini

Is there a way to reset the NVRAM so I might not have to swap it?

no,

read it off with expensive dr tools and copy it over, or remove the chip and solder it on the donor board. it is not a hard swap , it is small thin 8 pin chip

Yes, but not by you unfortunately.

Could we see a detailed photo of your board? Since you have a multimeter, we may at least be able to measure the supply voltages. That should tell us whether the motor controller is working at least partially.

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A backup a day keeps DR away.