Murach's Structured COBOL
Chapter 12 Concepts and terms for working with disk files
Disk concepts and terms 378
How data is stored on a disk drive 378
How the data in a sector is read or written 380
Blocked versus unblocked records 382
Fixed-length versus variable-length records 382
File organization concepts 384
Sequential file organization 384
Indexed file organization 386
Indexed file organization with alternate indexes 388
Relative file organization 390
VSAM file organizations 390
Typical programs that work with disk files 392
Interactive programs 392
Batch programs 394
Perspective 398
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