Diskette File Organization - IBM 5110 User Manual

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DISKETTE FILE ORGANIZATION
You use the )MARK command to format files on the diskette before
you can store workspaces or data records on the diskette. For
example:
)
M(.~
I:{K : 1 . 0
~::;
: 1 .
:1.:1.
t L
Diskette Drive 1
~
Starting File Number
'-----Number of Files to Format
' - - - - Size of the Files in Increments of 1,024 (1 K) Bytes. In this case,
the size of the marked files is 10,240 ( lOx 1,024) bytes.
Unlike tape files, the diskette files are not always formatted
sequentially on the diskette. For example, file 2 might be on cylinder
3
r
file 3 on cylinder 9, and file 4 on cylinder 7. You can control the
location of a file on the diskette only by using a totally unmarked
diskette and issuing )MARK commands in the same order as the files
are to be formatted on the diskette.
When the information in a diskette file is no longer needed, you can
use the )DROP command to mark the file unused so that the file is
available for other uses. However, once a file is formatted, you cannot
increase the size of the file without re-marking the file. Reallocating
diskette file space is discussed next.