CSE 120 Lecture Notes - Lecture 13: Page Cache, Flash Memory, File Descriptor
1 Mar 2018
School
Department
Course
Professor
Document Summary
How to best achieve & balance: archival storage - keep forever, including prev. Versions: support various storage technologies (i. e. different types of disks) Model as array of blocks of data (numbered, fixed size) Superimpose a structure in the array of blocks. 3 regions: file system metadata - data about the entire file system, file metadata - data about a particular file, data blocks - file contents. If we know how to access fsm, we know how to access the other parts! Which we know b/c it starts at 0! How many blocks in each region, and how many are free. Occupies a certain # of storage blocks in our abstract storage device. File control block: small amount of metadata for a file. Typically, many fcbs fit into 1 storage block. Attributes - type of file, size, permissions. References to data blocks (i. e. disk block map ) Name is a number (i. e. index) -to the os, not the user.
