I found this drive in one of Atari lots. Apart from few mentions in old articles I can't find any info whatsoever. Can you help please?
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I can't find any info whatsoever.
Most likely that's just a standard SCSI case (like Ross Ridge already assumed), notable due the existence of a terminator and an ACSI to SCSI cable (maybe even a homed made one). Being a rather standard drive it no hits may turn up in conjunction with Atari - in fact, there where zillions (almost) of shops that created their own brand by putting standard drives into standard cases and added their label. Also, SCSI never made the same huge sales as raw disks or IDE ones.
The drive could be a Pinacle 3.5" MOD drive. A as HP had dimples on the lid, Fujitsu a rounded insert and Sony's drives were full height.
Since ACSI is a strict subset of SCSI (*1), a single drive standard SCSI drive can be attached without minimal effort (*2). All you need would be some TOS driver for this device. Chances are good that even the standard removable hard disk driver for Ataris Syquest based Megadrive 44 will work - it might need some tweeking to recognise the drive and capacity.
*1 - Most important reduced address range (max. 4 devices) and only very basic protocol phases (no detach, Atari is always the master and alike) - see here for more details.
*2 - Ofc, using a 'real' ACSI to SCSI adaptor (thereare several,some still ailable, like this one) may be the better way. Then again, considering that there is already a D19 to Centronics attached, it might be already made to work out of the (missing) box.