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FLOPPY DISK

• It is a flat circular piece of flexible plastics
  coated with magnetic oxides.
• It is encase in a square plastic or vinyl jacket
  cover.
• The jacket give the handling protection to disk
  surface.
• They are also known as diskettes.

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Different floppy disk
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Types of Floppy Disk

• There are two types of floppy disk
• 1 Floppy disk drive.
• 2 31/2-inch Floppy disk.

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Floppy disk drive

• A floppy disk drive is a device used to
  read/write data to a floppy disk. It is of
  interchaeable disk type and allows
  loading/unloading of different floppy disk as and
  when they are used.
• Speed of floppy disk is about 300 to 400 rpm.
• And data transfer rate is 10 to 30
  kilobytes/second

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3½-inch floppy disk

• It is the most commanly used floppy disk. It is
  consist of 31/2-inch diameter disk encase in a
  square, hard -plastic jecket cover has a cutout
  for read /write head to make contact with disk
  surface. This appear is covered with a sliding
  metal piece.
• All 31/2-inch floppy disk are of double-side type
  record data on the both surface.

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These type of floppy disk come in different
capacity.

• 1 Double density
• 2 High density
• 3 Very high density

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Double density 31/2-inch diskette

• The duoble density diskettes have 40 trackes 18
  sector and 512 bytes/sector giving total storage
  capacity for the two surface is 720 kb.

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High Density 31/2-inch Disketts

• This diskettes have 80 trackes 18 secters and 512
  bytes/sector,diving the total storage capacity is
  1.4 mb.

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Very High Density 31/2-inch diskettes

• This diskettes have 80 trac
• ks, 36 sectors and 512 bytes/sectors, giving the
  total disk storage capacity is 2.88 mb.

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HARD DISK

• A hard disk drive (HDD), commonly referred to as
  a hard drive, hard disk, or fixed disk drive is a
  non-volatile storage device which stores
  digitally encoded data on rapidly rotating
  platters with magnetic surfaces. Strictly
  speaking, "drive" refers to a device distinct
  from its medium, such as a tape drive and its
  tape, or a floppy disk drive and its floppy disk.
  

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Types of hard disks

• PATA
• SATA

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PATA

• PARELLEL ADVANCE TECHNOLOGY ADVANCEMENT
• USES PATA INTERFACE TECHNOLOGY
• ITB USES RIBBON CABLES
• ROTATING SPEED-7200 rpm

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SATA

• Serial advance technology advancement
• Uses SATA interface technology
• It uses SATA cables
• Rotating speed-more than 7200 rpm

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