AT&T 3B2/300 Technical Reference Manual page 213

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120-MEGABYTE CARTRIDGE TAPE DRIVE (KS-23465,L1A)
The 120-Megabyte Cartridge Tape Drive is used as a streaming device for mass storage of data. As
the name suggests, the drive provides 120-megabytes of formatted storage capacity. Formatting of the
tape is not necessary because no Volume Table of Contents (VTOC) is used.
The 120-Megabyte Cartridge Tape Drive is capable of reading cartridge tapes that were written by a
60-Megabyte Cartridge Tape Drive. This allows greater data interchangeability between machines.
However, tapes written by 120-megabyte drives cannot be read on the 60-megabyte drive.
The drive may be an internal part of the 3B2 computer cabinet or it may be a separate SCSI
peripheral. Either way, connection to the 3B2 computer is via a SCSI Host Adapter card.
120-Megabyte Cartridge Tape Drive Equipment Characteristics
Physical.
Tape
Tracks
Tape Speed
Recording Density
Formatted Size
Height
Width
Depth
Operational.
Interface
Transfer Rate
DC600A cartridge tape ( or equivalent)
15
90 inches per second
10,000 bits per inch (nominal)
266,004 blocks (512-byte blocks) total
3.25 inches
5.75 inches
8.0 inches
SCSI (34-pin connector)
900 kilobits per second
EQUIPMENT DESCRIPTION 2-189