File operations

• Create

• Write

• Read

• File-Pointer

• Delete

• Reposition within file

• Turncate

• Open

• Close

  Sequential access

• Operations

  • read next
  • wirte next
  • reset
  • no read after last write (rewrite)

Direct access(relative access)

• Operations

  • read n
  • wirte n
  • rewrite n
    *n = relative block number

Other access method

Index

File 자체는 하드 디스크 상에 존재 하지만 Index나 file에 관한 정보는 Main memory에 load 되어 있다.

A typical file-system organization

Single-Level directory

Tree-Structured drectories