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Hard Disk Drive Components
 Basic components of a typical hard disk drives
are:
 Disk Platters
 Read/ Write Heads
 Head Actuator mechanism
 Spindle motor
 Logic Board
 Cables and Connectors
 Configuration items (like jumpers, switches etc)
Typical hard disk drive components
Hard Disk Platters(Disks)
 Have one or more platters or disks
 3 ½” are the most popular foe desktop
computers
 2 ½” and smaller are for notebooks and portable
devices
 No. of platters is limited by its vertical physical
size
 Maximum no. seen in 3 ½” drive is 12
 But most have 6 or fewer
 Originally made from
aluminium/magnesium alloy
 Latter platters made of glass were made
 One such made by Dow corning corp.
Called Memcor
 Composed of glass with ceramic implants,
enabling it to resist cracking
 Offers great rigidity than metals
 Thermally stable than aluminium platters i.e
(do not expand with changes in temperature )
• All modern drives use glass or glass-
ceramic platters
Fig: An example of a platter
Platters
Recording Media
 All platters are covered with
magnetically retentive substance called
medium
 Three popular magnetic medium are:
Oxide media
Thin-film media
AFC(anti-ferromagnetically coupled)
media
Oxide Media
 Made up of various components, iron
oxide as main
 Oxide coated platters are brownish or
amber
 Since oxide medium are soft, it subjects to
head crash damage
 Currently very few drives use oxide media
Thin-film Media
 It is thinner, harder and more perfect than
oxide medium
 Also known as plated or sputtered media
 Platted media are created by depositing
magnetic medium
 Sputtered media are created by
1. Coating platters with layer of nickel
phosphorus
2. Applying cobalt alloy in complete vacuum
deposition process
AFC Media
 Called anti ferromagnetically coupled
media
 It consist of two magnetic layer
separated by a thin 3-atom layer of
element ruthenium
 IBM uses term “pixie dust” to refer this
layer
 This AFC coupling causes the entire
thickness to be the difference of top &
bottom layer
 IBM introduced AFC with 2 ½” Travelstar
30GN series notebook in 2001
 In desktop 3 ½” drives started with
Deskstar 120GXP
 Now used by Hitachi Global Storage
Technologies
 AFC coated media looks like a mirror
Read / Write Heads
 Each platter ha two sets of read/write
heads
Set of read/write heads
 When drive is at rest, heads are forced
into direct contact with platters
 When spinning, air pressure develops
below the head, lifts them off
 Distance b/w head & platter while
spinning can be b/w 0.5 µ-in. to 5 µ-in

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Hard disk drive components

  • 1. Hard Disk Drive Components  Basic components of a typical hard disk drives are:  Disk Platters  Read/ Write Heads  Head Actuator mechanism  Spindle motor  Logic Board  Cables and Connectors  Configuration items (like jumpers, switches etc)
  • 2. Typical hard disk drive components
  • 3. Hard Disk Platters(Disks)  Have one or more platters or disks  3 ½” are the most popular foe desktop computers  2 ½” and smaller are for notebooks and portable devices  No. of platters is limited by its vertical physical size  Maximum no. seen in 3 ½” drive is 12  But most have 6 or fewer
  • 4.  Originally made from aluminium/magnesium alloy  Latter platters made of glass were made  One such made by Dow corning corp. Called Memcor  Composed of glass with ceramic implants, enabling it to resist cracking  Offers great rigidity than metals  Thermally stable than aluminium platters i.e (do not expand with changes in temperature )
  • 5. • All modern drives use glass or glass- ceramic platters Fig: An example of a platter Platters
  • 6. Recording Media  All platters are covered with magnetically retentive substance called medium  Three popular magnetic medium are: Oxide media Thin-film media AFC(anti-ferromagnetically coupled) media
  • 7. Oxide Media  Made up of various components, iron oxide as main  Oxide coated platters are brownish or amber  Since oxide medium are soft, it subjects to head crash damage  Currently very few drives use oxide media
  • 8. Thin-film Media  It is thinner, harder and more perfect than oxide medium  Also known as plated or sputtered media  Platted media are created by depositing magnetic medium  Sputtered media are created by 1. Coating platters with layer of nickel phosphorus 2. Applying cobalt alloy in complete vacuum deposition process
  • 9. AFC Media  Called anti ferromagnetically coupled media  It consist of two magnetic layer separated by a thin 3-atom layer of element ruthenium  IBM uses term “pixie dust” to refer this layer  This AFC coupling causes the entire thickness to be the difference of top & bottom layer
  • 10.  IBM introduced AFC with 2 ½” Travelstar 30GN series notebook in 2001  In desktop 3 ½” drives started with Deskstar 120GXP  Now used by Hitachi Global Storage Technologies  AFC coated media looks like a mirror
  • 11. Read / Write Heads  Each platter ha two sets of read/write heads Set of read/write heads
  • 12.  When drive is at rest, heads are forced into direct contact with platters  When spinning, air pressure develops below the head, lifts them off  Distance b/w head & platter while spinning can be b/w 0.5 µ-in. to 5 µ-in