Hard Disk
HARD DISK
DRIVES
•Performance
•Storage capacity
•Software support
•Reliability
Why we call it as…….
• Hard disk
• Fixed disk
• Winchester disk
Hard Disk Drive Components
•
•
•
•
•
•
•
•
Disk platter
Read/Write head
Head arm/Head slider
Head actuator mechanism
Spindle motor
Logic board
Air filter
Cables & Connectors
• Disk platter
• The data’s are stored in this media
• Form factor
9 5.5” - actual size is 5.12”
9 3.5” - actual size is 3.74”
9
9
9
9
2.5”
1 1/8”
1 1/3”
1”
• The 5.25” platter were used in earlier days
• Now a days it is replaced by the 3.5” platter •The 2.5”,1 1/8”, 1 1/3” & 1” platters are using in the laptop computers
•Among this the 1” platter are known as “Microdrive”
• Substrate
¾ The material by which a disk platter is manufactured o Aluminum o Glass or Glass Ceramic compounds
To hold the data on the substrate, it must be coated with magnetic media o Iron Oxide media o Thin Film media
¾ Iron Oxide media
9 It gives around 30 meu inch
thickness
9 Looks brown or amber in colour
9 Semi liquid coating of the iron oxide compound ¾ Thin Film media
9 Very thin coating
9 Only 1-4 meu inch thickness
9 It is coated over the substrate by using two types of process
Plating process
The media is produced by electroplating process
Substrate is immersed in different chemicals Sputtering process
It provides better thin film coating
This provides thinnest, hardest and finest media surface
3 substances are coated
Nickel phosphorous, Cobalt alloy, carbon coating
+ve points & cost are high
Read / Write heads
•
•
•
•
•
•
•
Ferrite heads
MIG heads
TF heads
MR/AMR heads
GMR heads
CMR heads
TMR heads
Ferrite heads
9 For Winchester disks
9 Made of iron oxide core wrapped with
electro magnetic coils
9 It is a u shaped iron core wrapped
with electrical windings
9 They are not so small in size
9 Used in hard disk up to 50 MB
Metal –In- Gap head
9 Same design as ferrite heads
9 Added a special metallic alloy on the head 9 Usually found
DRIVES
•Performance
•Storage capacity
•Software support
•Reliability
Why we call it as…….
• Hard disk
• Fixed disk
• Winchester disk
Hard Disk Drive Components
•
•
•
•
•
•
•
•
Disk platter
Read/Write head
Head arm/Head slider
Head actuator mechanism
Spindle motor
Logic board
Air filter
Cables & Connectors
• Disk platter
• The data’s are stored in this media
• Form factor
9 5.5” - actual size is 5.12”
9 3.5” - actual size is 3.74”
9
9
9
9
2.5”
1 1/8”
1 1/3”
1”
• The 5.25” platter were used in earlier days
• Now a days it is replaced by the 3.5” platter •The 2.5”,1 1/8”, 1 1/3” & 1” platters are using in the laptop computers
•Among this the 1” platter are known as “Microdrive”
• Substrate
¾ The material by which a disk platter is manufactured o Aluminum o Glass or Glass Ceramic compounds
To hold the data on the substrate, it must be coated with magnetic media o Iron Oxide media o Thin Film media
¾ Iron Oxide media
9 It gives around 30 meu inch
thickness
9 Looks brown or amber in colour
9 Semi liquid coating of the iron oxide compound ¾ Thin Film media
9 Very thin coating
9 Only 1-4 meu inch thickness
9 It is coated over the substrate by using two types of process
Plating process
The media is produced by electroplating process
Substrate is immersed in different chemicals Sputtering process
It provides better thin film coating
This provides thinnest, hardest and finest media surface
3 substances are coated
Nickel phosphorous, Cobalt alloy, carbon coating
+ve points & cost are high
Read / Write heads
•
•
•
•
•
•
•
Ferrite heads
MIG heads
TF heads
MR/AMR heads
GMR heads
CMR heads
TMR heads
Ferrite heads
9 For Winchester disks
9 Made of iron oxide core wrapped with
electro magnetic coils
9 It is a u shaped iron core wrapped
with electrical windings
9 They are not so small in size
9 Used in hard disk up to 50 MB
Metal –In- Gap head
9 Same design as ferrite heads
9 Added a special metallic alloy on the head 9 Usually found