High-level Abstraction

U

Hiding unnecessary detail from the programmer

Type of recording used for writing to disk and reading data - hidden from the programmer

simple view of the file structure, not how the files are stored, but how the programmer (user) can access or change them

Hiding low level detail and presenting an interface for applications

To present the user with the equivalent of an extended or virtual machine

Processes : dedicated CPU.
Virtual Memory : Infinite RAM.
File: Data typed permanent memory (e.g sequential, random, associative access).
Channel: Data typed I/O device (e.g sequential, random, associative access).
Shell : programmable user interface.