Seagate Rosewood Families, Headmaps and Preamps

[lcoughey]

Patient:
Model: ST1000LM035
PN: 1RK172-568
FW: SBM3
Family: Rosewood 8C
Heads: 2
DOM: 16JUN2016
SN: W93...
Preamp: 82

Donor 1:
Model: ST1000LM035
PN: 1RK172-568
FW: SBM3
Family: Rosewood A5
Heads: 2
DOM: 11OCT2019
SN: ZDE
Preamp: 87

Drive detected and was able to save SA and start imaging in DE, until it hit a bad sector. Was unable to write to SA.

Donor 2:
Model: ST1000LM035
PN: 1RK172-568
FW: SBM3
Family: Rosewood A5
Heads: 2
DOM: 29OCT2017
SN: ZDE
Preamp: C2

Drive detected as 0MB, thanks to the previous set of heads. Was able to fix the translator by writing to the drive and now mirroring again.

[Marko]

Hello

Does anyone of you know what Preamp has St2000lm007 with SN: WDZ and FW: LDM2? I've already tried heads with SBK2, WDZ and ZDZ and no efect.

Best regards

[lcoughey]

It seems now that the next challenge is to figure out how we can safely identify the head count in a drive when some models can vary between 2, 3 & 4 heads.

[italyassistance]

If donor drive with patient PCB tries to spin up and send messages in terminal then make sense to swap heads, if doesn't try to spin up then heads are not compatible.

[lcoughey]

If donor drive with patient PCB tries to spin up and send messages in terminal then make sense to swap heads, if doesn't try to spin up then heads are not compatible.

That sort of works, but tough to implement when you haven't even ordered in the donor.

[Skyclad]

In the end it seems to me there is no rule in finding a donor capable of writing.

In one case I tried 3 donors WDZ, same P/N, same FW only the preamp was 82 instead of the patient's C2 (but we saw that C2 and 82 are interchangeable).

They read but did not write. In a nutshell you have to go by trial and error, so the more drives you have in stock the better. Basically if you have to order on the net (apart from Donor Drives) it's like going in blind.

[lcoughey]

They read but did not write. In a nutshell you have to go by trial and error, so the more drives you have in stock the better. Basically if you have to order on the net (apart from Donor Drives) it's like going in blind.

I am finding this too. It is most infuriating to change the heads, read full SA, but not be able to fix any issues due to writing compatibility. I've even gone so far as to match the marking details on the heads, themselves, with varying levels of success. The odd thing is, I've found them more difficult to match over the past year than in years prior. Not sure if something changed or I am just getting a bunch of bad luck.

[Skyclad]

They read but did not write. In a nutshell you have to go by trial and error, so the more drives you have in stock the better. Basically if you have to order on the net (apart from Donor Drives) it's like going in blind.

I am finding this too. It is most infuriating to change the heads, read full SA, but not be able to fix any issues due to writing compatibility. I've even gone so far as to match the marking details on the heads, themselves, with varying levels of success. The odd thing is, I've found them more difficult to match over the past year than in years prior. Not sure if something changed or I am just getting a bunch of bad luck.

I certainly don't have your experience of heads swap, of course, by force of circumstances I'm doing it with these nightmare drives. Anyway any info I will share here in your forum especially in the thread related to internal parts (HSA code..etc)

[webclaw]

Source: WCC 0,1,2,3 .82
Replaced: ZDZ 0,1,2,3 .82

Read SA OK.
Cannot write SA.

[lcoughey]

Source: WCC 0,1,2,3 .82
Replaced: ZDZ 0,1,2,3 .82

Read SA OK.
Cannot write SA.

Thanks for shareing. I'm curious, are you able to also provide the markings on the head connector, too? (ie, TIAB1-D, AG-1, etc) Both sets of numbers would be even better.