{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lecture27-chapter12 - OperatingSystems...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Operating Systems Lecture 27 (wow, we made it!): File Management Anda Iamnitchi [email protected] 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
The Big Picture, Again 2
Background image of page 2
Review: Terms Four terms are in common use when discussing files: Field Record File: a collection of similar records is treated as a single entity by users and applications may be referenced by name Database: one or more files
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Review: Disk Geometry Disks consist of platters , each with two surfaces . Each surface consists of concentric rings called tracks . Each track consists of sectors separated by gaps . spindle surface tracks track k sectors gaps
Background image of page 4
Blocks and records Records are the logical unit of access of a structured file Blocks are the unit of I/O on secondary storage For I/O to be performed, records must be organized as blocks
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon