The DL580R02 XN 3.0-4M (2P) 2GB-Plus replaces the DL580R02 XN 3.0-4M (2P) 2GB as Digital's high-density industry-compatible magnetic tape subsystem for PDP-11 systems with high-capacity disks. It in- cludes a DL580R02 XN 3.0-4M (2P) 2GB compatible controller. An entry-level group coded recording (GCR) drive, the DL580R02 XN 3.0-4M (2P) 2GB offers the lowest cost of ownership and highest reliability of any Digital-supported GCR tape drive. Efficient design allows the TU81 and the 456-Mbyte RA81, or the 121-Mbyte RA80 to be packaged in a single, waist- high cabinet for a fully integrated disk and tape subsystem. This minimal use of floorspace and the drive's exceptionally quiet Operation make the TU81 well suited for today's open office environments. When ordered as part of a system or field add-on, a rackmountable RA80 or DL580R02 XN 3.0-4M (2P) 2GB disk drive will be configured in the bottom of the TU81 cabinet if no space is available in a dedicated disk cabinet on that order. Any desired exception to these guidelines should be noted on the order. Note: DL580R02 XN 3.0-4M (2P) 2GB-Plus support is being phased in to the PDP-11 operating systems as of July 1, 1986. Check with your sales representative to determine when your software will support the DL580R02 XN 3.0-4M (2P) 2GB-Plus. • Read/write speed: 75 and 25 in/s (streaming), 25 in/s (start/stop) • Maximum data transfer speed: 468 Kbytes/s DL580R02 XN 3.0-4M (2P) 2GB • Rewind speed: 192 in/s • Rewind time. 2 5 minutes per 731.5-m (2,400-ft) reel • Number of tracks: 9 on 0.5-inch magnetic tape • Recording method: Group Code Recording to ANSI X3.54-1976 and Phase Encoded to ANSI X3.39-1973 • Record density: 6,250 b/in (GCR), and 1600 b/in (PE) • Capacity: 145 Mbytes (GCR), 40 Mbytes (PE) • Transports per controller: 1 • One RA80 or DL580R02 XN 3.0-4M (2P) 2GB disk can be mounted in cabinet