Lardman wrote:
fzabkar wrote:
This is my take on the situation:
Code:
donor HDA + donor PCB + donor ROM + patient heads -> spin up, ID, seek, no data access
patient HDA + patient PCB + patient ROM + donor heads -> spin up, beep, no seek
patient HDA + donor PCB + donor ROM + donor heads -> spin up, ID, seek, no data access
patient HDA + patient PCB + donor ROM + donor heads -> spin up, ID, seek, no data access
For some reason, the patient ROM doesn't get along with the donor heads.
Or the donor heads are now damaged and this is the result.
Code:
donor HDA + donor PCB + donor ROM + DONOR heads -> spin up, ID, seek, no data access
Fzabkar,
If the donor heads were damaged (which is theoretically possible, e.g. a broken tape during change the heads or some other damage, e.g. electrostatic), they would behave in the same way with the donor's bios (the same "beep").
And this is not the case - Hdd trying to calibrate with the donor's bios.
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During the exchange I checked:
Patient surfaces without any damage.
Patient heads - clean as a tear - no trace of contact with the plates.
The replacement of the heads went smoothly - without any errors or problems.
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I would simplify it - no PCB - because I checked it in all possible ways - PCB is meaningless.
Given that the donor positioner does not work with the patient's rom - I would not consider platers either
During the exchange I checked:
Patient surfaces without any damage.
Patient heads - clean as a tear - no trace of contact with the plates.
donor HDA + donor ROM + patient heads -> spin up, seek, ID, no data access (as expected, because at least one of the patient's heads is not working - preamp channel?)...
donor HDA + patient ROM + patient heads -> spin up, seek, no ID, no data access
patient HDA + patient ROM + donor heads -> spin up, beep, no seek
patient HDA + donor ROM + donor heads -> spin up, seek, no ID, no data access
Considering that in the production process of the same batch of disks (twin disks) all elements are the same - it is impossible for them to differ at the production level and to be differentiated as to the differentiation of individual components.
Yes - in the post-production process (of the same batch of discs) - PLlists, serial numbers, adapters are differentiated and determined ... but not different heads or their preamplifiers. The supplier delivers them all the same (of course - as part of delivery to the same production batch).
Therefore, I believe that this is clearly a problem between the bios and the head.
And the changes - that the disk automatically made to the FW at the time of failure.