Hi Paul, Actually I've got a couple of these units, and as Bruce has indicated yes they're a Data General manufactured product. (Bruce is the one with vastly more DG knowledge than myself). Mine is a '6098', which is really an integrated combination of fixed disk drive, floppy disk drive and controller card. As Bruce has mentioned there will also be the internal DG product number, prefixed with 005, on it somewhere (it's possible yours isn't exactly the same model as mine). This manual is up on Bitsavers: http://www.bitsavers.org/pdf/dg/disc/Disc_Subsystem/014-000638-00_6097_6098… DG manufactured drives up through 300MB removable pack type drives, and fixed drives with capacities into the multi-GB area (used in MV series systems).