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Presented by---
Saubhagya surya
PRESENTATION UPON HARD DISK DRIVE
HARD DISK DRIVE
A hard disk is part of a unit, often called a "disk drive," "hard drive," or "hard disk drive," that stores and provides relatively quick access to large amounts of data on an electromagnetically charged surface or set of surfaces. Today's computers typically come with a hard disk that contains several billion bytes (gigabytes) of storage.
Basic component of hard disk drive
I. Disk platters
II. Read/write heads
III. Head actuator
IV. Spindle motor
V. Logic board
VI. Cables & connectors
VII.Circuit cable
VIII.Shock Mount
IX. Actuator
X. D.C. power input
Electromechanical
01-Rotating disks02-Arm assembly
Electronics
01-Disk controller02-Cache03-Interface controller
Hard Disk Drive (HDD) Components
HDD OrganizationArm
AssemblyArm
Spindle
Cylinder
TrackPlatter
PATA
Successor to ST-412/506/ESDI by integrating the disk controller completely onto the device. Incapable of concurrent operations.
SATA
Modification of ATA, uses serial communication
instead of parallel
What Is A Hybrid Hard Disk (H-HDD)?
DRAMCache
NVCache
A HDD also has a non –volatile cache
All disk have a Dram cache
Reading
Process of transferring items form
storage media to memory
Writing
Process of transferring items from memory to
storage media
Hardware thatRecords
DataFunctionas source of input
Creates output
A Magnetic ‘Bit’ Bit-cell
composed of magnetic grains
- 50-100 grains/bit
‘0’-Region of grains of uniform magnetic polarity
‘1’-Boundary between regions of opposite magnetization
UNIT Storage capacity
Kilobyte (KB) 1 Thousand
Megabyte(MB) 1 Million
Gigabyte(GB) 1 Billion
Petabyte(PB) 1 Quadrillion
Exabyte(EB) 1 Quintillion
Zettabyte(ZB) 1 Sextillion Yottabyte(YB) 1 Septillion
PERFORMANCE: WHAT DO USERS SEE?
A. Slow state transitions a. Boot, hibernate, resume
B. Increased disk access under memory pressure
a. Reduces performance
C. Program launch can be slow a. Cold memory b. Competing I/O
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