That's weird. The STxxxxxN drives were all SCSI and that's no SCSI drive, at least, the PCB definitely isn't. Could this perhaps be a transplant - someone took the logic board from a (dead?) ESDI drive like the ST4182E and stuck it onto a corresponding (formerly) SCSI physical disk?

dionb wrote on 2022-06-27, 22:00:

That's weird. The STxxxxxN drives were all SCSI and that's no SCSI drive, at least, the PCB definitely isn't. Could this perhaps be a transplant - someone took the logic board from a (dead?) ESDI drive like the ST4182E and stuck it onto a corresponding (formerly) SCSI physical disk?

All the cables and connectors from drive itself perfectly fitted to PCB, it looks solid. And STxxxxxN looks completely different, example: https://www.ebay.com/itm/125241044303

OK, for the moment it looks similar to series Wren III.
and then, it should be one of this drives I suppose:
CDC (also see Seagate)

Formatted Speed
Model Number Capacity Cyl Heads SPT in ms Interface
================================================================
94166-101 Wren III 84 969 5 34 18 ESDI
94166-141 Wren III 118 969 7 34 18 ESDI
94166-182 Wren III 152 969 9 34 16 ESDI

This was CDC, not 1GB, nor SCSI or ESDI, actually around 80 to 100MB, MFM, I had worked on one of these back in the day. it should make LOUD "plonk!" I think when starting up to unlock heads.

Cheers,

pentiumspeed wrote on 2022-06-28, 00:43:

This was CDC, not 1GB, nor SCSI or ESDI, actually around 80 to 100MB, MFM, I had worked on one of these back in the day. it should make LOUD "plonk!" I think when starting up to unlock heads.

Cheers,

Indeed, I have check with the photos in internet again and found that PCB from this SEAGATE 94155-86 has the same ID, so it is definitely 94155-XX Wren II series.

Unfortunately drive can not initialize the heads, after the several attempts it stopped the motor. Here is the short video with the opened drive. All heads looks OK.