MGMT 104 Lecture Notes - Lecture 4: Direct-Access Storage Device, Holographic Versatile Disc, Optical Storage

• School: Clark University
• Department: Management
• Course: MGMT 104
• Professor: Michael Krikonis

Document Summary

Devices that store large amounts of data, instructions, and info more than allowed with memory. Are not directly accessible by the cpu. Data must be retrieved in the order in which it is stored. Devices used are called sequential access storage devices (sasds) Records can be retrieved in any order. Devices used are called direct access storage devices (dasds) Magnetic tapes : a type of sequential secondary storage medium. Primarily for storing backups of critical organizational data. Hard disk drive (hdd) : a direct access storage device; consists of rapidly rotating disks coated with magnetic material. Redundant array of independent/inexpensive disks (raid): a method of storing data that generates extra bits of data from existing data. Disk mirroring : a process of storing data that provides an exact copy that protects users fully in the event of data loss. Virtual tape: a storage device for less frequently needed data.