The limitation applies to: - all VAXstation 3100 machines - to the MicroVAX 3100 Models 10 and 20 and - to the MicroVAX 3100 Models 10e and 20e *if* the ROMS are older than April 1992 (I forget the version number ...) So the MicroVAX 3100 Model 30 and Model 40 are not subject to this limitation. Note that the MicroVAX 3100-30/40 are nothing at all to do with the VAXstation 3100-30/40 (different processors, different ROMs, different vintage entirely). I don't know of any firmware restrictions other than the 1(.073)GB limit in the VS3100-30/40,UV3100-10/20[e]. The only reason I can think of for a 4GB limit being quoted is that at the time that the MicroVAX 3100-30/40 were released the RZ29 (4GB drivce) was the largest supplied by DEC. So it's possible that they never qualified anything else (and the largest I know of DEC releasing was the 9GB RZ1D or some such). Another reason might be that older versions of OpenVMS were more fussy about the drives that they would accept. Later versions ("later" here meaning from sometime in the mid 1990s) were more tolearant (of the sh*tty SCSI support that drives of that era gave :-)). The main things to watch out for are cooling - but I would expect that today's drives (5400 and 7200 ones at least) run cool enough for those cases. Antonio -- --------------- Antonio Carlini arcarlini(a)iee.org