this Samsung HM120JI stay always busy, it spins, the heads try to calibrate i suppose ( they make many noise like they cant find servo track )
i post the terminal log here, i think can't be heads problem:


 1.5G Limited
SPW 1.5G Link Ok! 
IndS=+00004
Spn OK
H: +00000
UF: 1st Gray err
H: +00001
Load
SK C: 0000DFD8
ENG>SRV> AP_FSAM
C: 0000DFD8 H: +00001
UF: 1st Gray err
H: +00001
SK C: 0000DA77
AP_FSAM
C: 000001F4 H: +00000
SR : +00000
UF: 1st Gray err
H: +00001
AP_FSAM

Hi,

Most probably you got H1 damaged.
But of course, needs further checking.

Hi David,

to be sure i have just swapped since i had the donor in laboratory: it is not concerned from heads ( on donor they are perfectly working )

uhm firmware issue.. i try also hot swap but didn't work

Terminal output points to heads most likely. If donor heads are good then maybe media damage?

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Hi Nikola, yes i suppose media demage in SA, so i wanted to find out a loader or something to put in ram and boot the hdd..

Media damage is also odd, if heads are still working fine on donor.

It could be a FW issue, but difficult to understand just like that.

Have you tried to put patient heads on donor drive ?

yes, they work like a charme on donor... but i am not happy!

Have you checked if head map on patient and donor is the same?

no i didn't ( you think it matters ?)

It could be that the patient heads worked on patient, because one damaged head could not be in use.

you mean donor or patient here:
" It could be that the patient heads worked on (patient) " -> donor

I mean patient on donor

yes heads are fully ok (read and write test performed) on donor.

would like to try rom swap but i cant find "25" on any chip..

Hi,

In that case, there's no external ROM, it's within the CPU.