Alternate Cylinders; Diskette Types And Formats - IBM 5110 User Manual

Alternate Cylinders
The last two cylinders (75 and 76) are reserved for use as
replacements (alternate cylinders) for defective cylinders. The
remaining cylinders (1 through 74) are used for storing data.
DISKETTE TYPES AND FORMATS
The 5110 uses three types of diskettes; the one-sided diskette (1),
with data recorded on just one side; the two-sided diskette (2), with
data recorded on both sides; and the two-sided diskette (20), with
data recorded on both sides at double density. The diskettes are
initialized (see
Disk Initialization)
into various formats consisting of:
• The number of sectors per cylinder
• The number of bytes per sector
The possible diskette formats are:
Sectors Sectors Bytes
per per
per
Track
Cylinder Sector
F6
26 128
Diskette
1 15 15 256
8 8 512
e
6
52 128
Diskette 2 15 30 256
8 16 512
L6
52 256
Diskette 20 15 30 512
8
16 1,024
Note:
The diskette types (1, 2, or 20) are identified on the diskette
label, and the )VOLIO command can be used to determine the bytes
per sector (record size).
Diskette Concepts
85