Semi conductor memory

Magnetic disks

Compact disks

Magnetic taps

Secondary memory

Tertiary memory

Primary memory

Cache memory

Critical Disk-Read Only Memory

Compact Disk- Random Only Memory

Critical Disk-Radius Only Memory

Compact Disk-Read Only Memory

Input

Output

Software

Storage

Main Object Drive

Magneto-Oriented Drive

Magneto-Optical Drive

Main Oriented Drive