March 2007
Beginner
526 pages
13h 53m
English
book
Introduction to the New Mainframe: z/VSE Basics
by Wolfgang Bosch, Hans Joachim Ebert, Helmut Hellner, G. M. (Jerry) Johnston, Wilhelm Mild, Ingolf Salm, Joerg Schmidbauer, Martin Walbruehl, Mike Ebbers
Content preview from Introduction to the New Mainframe: z/VSE Basics
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Chapter 5. Working with files 143
For
Count Key Data (CKD)
2
devices:
– A disk drive contains cylinders.
– Cylinders contain tracks.
– Tracks contain data records and are in CKD format.
For FBA devices:
– The disk drive is divided into blocks of fixed length.
– Blocks contain the data.
5.4.2 What are DASD labels?
The operating system uses groups of labels to identify DASD volumes and the
files they contain. Customer application programs generally do not use these
labels directly. DASD volumes must use standard labels. Standard labels include
a volume label, a file label for each file, and optional user labels. A volume label,
stored at track 0 ...
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