Volume Label Layout; Volume Label Format; Volume Label Fields - IBM 5114 Maintenance Information Manual

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VOLUME LABEL FORMAT
The volume label is located at track 00 head 0 record 7
on all diskettes. It identifies the diskette and indicates
to the adapter how the information on the diskette is
arranged. The volume label is encoded on the diskette
every time the diskette is initialized using the
initialization utility program. The volume label is always
encoded in FM format. This label is read and verified
each time a sense command is issued to the diskette
drive.
Volume Label Fields
Volume Label Identifier and Number (0-3): Identifies this
particular portion of the diskette as a volume label (for
example: VaLl).
Volume Identifier As Specified By User (4-9): Identifies
this diskette. This identifier contains up to 6 alphameric
characters. The identifier is specified during diskette
initialization.
Accessibility (10):
Indicates if the diskette can be read
from or written to. If this bit is on, the diskette cannot
be read from or written to. This bit can be turned on or
off using the )VOLID command in APL or the UTIL
command in BASIC.
System Identification (24-36): Identifies the system or
system group on which the diskette was initialized (for
example: IBM 5100).
Owner Identification (37-50): This field contains 14
alphameric characters. Identifies the owner of the
diskette or the owner of the information written on the
diskette.
Extended Label Area (64):
Indicates how many, if any,
additional tracks have been allocated as header label
tracks. Up to 9 additional tracks on each side of a
diskette 2d can be set aside for header labels (for
example: 0
=
no additional tracks, 1
=
one additional
track).
track 00, side 0
=
19 labels
track 00, side 1
=
52 labels (2 labels per sector)
9 additional tracks, both sides
=
936 labels
Volume Surface Indicator (71):
Identifies the diskette as
a diskette 1 diskette 2 or a diskette 2d. Set to space for
a diskette 1, 2 for a diskette 2, or M for a diskette 2d.
Extent Arrangement Indicator
(72):
Not used on 5114
diskette drive. Must be set to space.
Special Requirements Indicator (73): Not used on 5114
diskette drive. Must be set to space.
Physical Sector Length (75): Specifies the sector length
as 1 28 bytes, 256 bytes or 512 bytes. Set to space for
1 28 bytes, 1 for 256 bytes, 2 for 51 2 bytes, or 3 for
1024 bytes.
Volume Label 3-15