Magnetic Disk Storage System

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Magnetic Disk Storage System

Magnetic storage is a non-volatile storage of data.

The magnetic disk is a successor to magnetic tape. There are lot of common things: encoding, tracks, gaps, marks, etc. The magnetic tape is sequential media, but the disk is (quasi-)random access media.

A magnetic disk storage system practically divided into three part:

  • Disk controller
  • Disk drive
  • Disk(s)

There are two main magnetic disk storage system:

  • Fixed disk or Hard disk - disks are not removable
  • Floppy disk - disk is removable, the medium is changeable in the drive

Floppy disk storage

The parts of the system:

  • Floppy Disk Controller (FDC) - a high level interface between the CPU and the disk drive
  • Floppy Disk Drive (FDD) - the low level device for performing basic operations
  • Floppy Disk - the storage medium itself