AT&T 3B2/300 Technical Reference Manual page 203

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FLOPPY DISK DRIVE (KS-23114,L4)
Floppy Disk Drive Use
One 5.25-inch, 720-kilobyte (formatted), 96 tracks-per-inch floppy disk drive is equipped for all
3B2 computer configurations. A second floppy disk drive can be equipped in an AT&T Expansion
Module (AT&T/XM). Connection to the host 3B2 computer is via a CM195H Cartridge Tape Controller
(CIC) Card. While it is possible to equip more than two floppy disk drives on a system, equipage of
more than two floppy disk drives is not practical. Two floppy disk drives provide drive-to-drive
operational capabilities that are considered to be the optimum floppy disk drive equipage.
Floppy disks can be used as file systems or as streaming devices. When used as a streaming device,
data is written to and read from the floppy disk using a cpio -o and cpio -i type commands. In cpio
form, the floppy disk provides 1422 blocks (512-byte blocks) of storage. When used as a file system,
the fixed partitioning of the floppy disk provides a maximum of 1404 blocks (partition 5).
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