Storage Devices and Media

Storage Devices and Media

1. Magnetic Backing Storage Media

   • store data in the form of tiny magnetized dots
   • created, read and erased using magnetic fields created by very tiny electromagnets
   • fixed hard disks and drives
   • portable and removable hard disks
   • portable and removable hard drives
   • magnetic tape drives and magnetic tapes
   • memory cards

2. Optical Backing Storage Media

   • save data as patterns of dots that can be read using light
   • CD (Compact Disc)
   • DVD (Digital Versatile Disc)
   • CD-ROM/DVD-ROM
   • CD-R/DVD-R
   • CD-RW/DVD-RW
   • DVD-RAM
   • Blu-ray discs

3. Solid State Backing media

   • No moving parts, consume much less power, extremely robust, fast access time. high data transfer rate and compact
   • SSD (Solid State Drive)
   • Flash Drives (pen drive/memory stick/USB stick)

4. Types of Data Access

   • Sequential
   • Random