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• Basic abstraction for non-volatile storage.

• Typically comprises a single contiguous logical address space.

• Internal structure:

1. None (e.g. sequence of words, bytes)

2. Simple record structures

– lines

– fixed length

– variable length

3. Complex structures

– formatted document

– relocatable object file

• Can simulate 2,3 with byte sequence by inserting appropriate control characters.

• All a question of who decides:

– operating system

– program(mer).

Operating Systems — Files and File Meta-data

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