On 1 Jul 2011, at 07:46, Johnny Billquist wrote: RA92 is 1.4G. I think 1.6GB is the unformatted size, 1.4GB after initialize. To check free space on your disks: "SHO DEV D" Shows only 17865 blocks free :\ That's less than 9 MB? (if my maths works out using 512byte blocks) I played about and got a better report using SHOW DEV/FULL DUA0 (came back to me - I knew I'd read it in the handbook somewhere) which dumps: Disk VAX001$DUA0:, device type RD54, is online, mounted, file-oriented device, shareable, available to cluster, error logging is enabled. Error count 0 Operations completed 2759 Owner process "" Owner UIC [SYSTEM] Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W Reference count 42 Default buffer size 512 Total blocks 311200 Sectors per track 17 Total cylinders 1221 Tracks per cylinder 15 Volume label "VAXINE" Relative volume number 0 Cluster size 9 Transaction count 150 Free blocks 17865 Maximum files allowed 15560 Extend quantity 5 Mount count 1 Mount status System Cache name "_VAX001$DUA0:XQPCACHE" Extent cache size 64 Maximum blocks in extent cache 1786 File ID cache size 64 Blocks currently in extent cache 1674 Quota cache size 0 Maximum buffers in FCP cache 1227 Volume owner UIC [1,1] Vol Prot S:RWCD,O:RWCD,G:RWCD,W:RWCD Volume Status: ODS-2, subject to mount verification, protected subsystems enabled, file high-water marking, write-through caching enabled. And yes, 4.8GB should be more than enough. Not sure what is going on... What is going on is SIMH isn't accessing the full size of the files I specified. Even though I used RAUSE R disk types it seem to assume they are RD54s, which are only 172MB (confirmed: I googled RD54s and they are 173MB drives)?! I have started with another 3-disk system using RA92s. It seems if you use a set disk type and a valid file path it will build a new file for you. This is fun learning, and annoying at the same time :D -- Mark Benson My Blog: <http://markbenson.org/blog> Follow me on Twitter: http://twitter.com/mdbenson "Never send a human to do a machine's job..."