I can't seem to find the cause of this problem which results whenever a (specific) recently created FILELIST is accessed (INDEX, GET or otherwise). This error is mailed to the postmaster: Error 100 from LSVDACC while preparing FILELIST: "Disk L is not a fixed-access disk." Here are the MDISK. lines (minus real CUU) from LOCAL SYSVARS: MDISK.000 = '* N W L 85 100 //000: BIT driver package.' MDISK.000 = '* N W L 90 100 //000: SSC HEPLIB files.' The FILELIST in question has its files stored on the HEPLIB disk. Thanks for your assistance, --Shane