Hello friends

It 's for hitachi hgst arm hts545050a7e660 that spin up no clicking but not recognized and no seeking head,I can read just rom and nvram but none of the modules.
Can anyone help me with compatible donor rom+nvram ?
And by the way in the hitachi arm series does the nvram chip is separate (I can't find it ) or it just part of the 25U406C rom chip ?
Also if nvram from model hts325050a7e660 but same pcb number will it match ?

Thanks

Examine the header of the NVRAM, then search for this header in the ROM. This will answer your question.

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So if original nvram+copy are in rom there is no use for the term nvram in the arm series we can refer only to rom like in other brands,in other words the relationship between rom and nvram (separate chip) who were in regular hitachi irrelevant for arm series.
what is interesting to know is if we change values in nvram copy 0 what will happen to copy 1,with my sd tool I can read write just main nvram and just read rom
to write rom need to do it physically
Anyway I'm still looking for HTS545050A7E660 rom donor.

Thanks

I meant if nvram from model hts545032a7e660

can you upload the ROM+NVRAM ?

Here,
I think something wrong in cpoy 2 (offset 0x4000-0x4ff0 ) every time I power the disk some bits change.

have you tried to disable heads ?

Your problem are heads or/and broken modules.

My money is on heads/preamp, especially if the heads don't even seek.

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Is't possible to disable heads on not recognized disk and no access to none of the modules ?

Thanks

Disk gets ready in a second but when load from hdd it get error.

Thanks

I am not sure 100% about there no seeking head,but the disk power smoothly no clicking sound at all,and customer said it happened suddenly and the disk didn't fell or got hit.
The problem is the price for this donor heads starting from $250! so I must first deprive the cheap option.

Thanks

disabling head/s, I.e. modify the head map
it's done in NVRAM, and have nothing to do with mod's

Some how the head map in my hd doctor is gray (not available) even the status is ready so I need to do that manually thing I know how to do in the standard hitachi, but in the arm series can you tell me in what line the head map location from the file I have upload,its slim disk with 2 head and I have a lot of 00 01 in the NVRAM.

Thanks

Here is your head map:

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A backup a day keeps DR away.