RD52-D, -R Add-on 31-Mbyte fixed-disk drive Disk 146GB, SAS, 10k, SFF, SP Integrated 20-Mbyte "half-height" fixed-disk drive for BA23 (11/53 only) Disk 146GB, SAS, 10k, SFF, SP Integrated' second 20-Mbyte "half height" fixed-disk drive, with cables and stacking hardware (11/53 only) RX33A-AA Integrated 1.2-Mbyte "half-height" floppy-disk drive for BA23 (11/53 only) Disk 146GB, SAS, 10k, SFF, SP Integrated second 1.2-Mbyte "half-height" floppy-disk drive, with cables and stacking hardware (11/53 only) RX50A Integrated 800 Kbyte dual-diskette drive - RX50-D, -R Add-on 800-Kbyte dual-diskette drive Disk 146GB, SAS, 10k, SFF, SP RD/RX disk controller RQDXE RQC25-AA Extender module for the RQDX3 controller RQC25-BA Add-on 52-Mbyte fixed/removable-disk drive Rackmount 52-Mbyte fixed/removable-disk drive MicroPDP-11 Multiuser Systems Options Disk 146GB, SAS, 10k, SFF, SP Integrated 95-Mbyte cartridge-tape drive TK50-D, -R Add-on 95-Mbyte cartridge-tape drive TQK50 TK50 tape controller TSVO5 -AA/AB 40-Mbyte streaming-tape drive, 120/240 V