Hard Disk Drive

What is a Hard Disk Drive?

A hard disk drive , though technically a secondary  form of storage.
A hard disk drive (HDD) , hard disk, drive or fixed disk is an electro -
mechanical data storage device that uses magnetic storage to
store and retrieve digital data using one or more rigid rapidly rotating
platters coated with magnetic heads, usually arranged on a moving
actuator arm, which read and write data to the platter surfaces. Data
is accessed in a random -access manners, meaning that individual
blocks of data can be stored and retrieved in any order. HDDs
are a type of non-volatile storage, retaining stored data even when
powered off.  The features of HDDs that have made them an
irreplaceable  component in our computers are their high capacity for
storing data and the high speeds at which they can access it at relatively
lower  cost. They come in various interfaces and specification such as
IDE, EIDE, SCSI, SATA, and SATA II.

Hard Disk

                                                                         












Best Manufacturers Company of Hard Disk :-     

• Western Digital
• Seagate 

Other Company of Hard Disk :-

• Toshiba
• Samsung
• SanDisk
• Hitachi
• G-Tech     

Western Digital Hard Disk some categories Blue, Black,Purple, 

Red, Gold  :- 

• WD Blue PC HDD

Solid Performance and Reliability for Everyday Computing .

PC Storage Designed Specifically for Desktops, Laptops, 

and All-In-One PCs.

Specifications :-

Features    WD Blue 2.5"    WD Blue - 5400 RPM    WD Blue - 7200 RPM

 Capacity       320GB-2TB         500GB -2TB                       500GB -1TB     
Form factor       2.5",7mm          3.5"                                    3.5"      
RPM Class        5400                       5400                               7200
Interface            SATA 6GB/s      SATA 6GB/s                   SATA 6GB/s

• WD Black PC HDD

Black Hard Disk

Maximum Performance for Power Computing
for Power Computing.
Highlights
Performance storage available in up to 6TB capacities.
Designed for creative professionals, gamers, and system builders.Western Digital’s StableTrac and Dynamic Cache Technology increase reliability and optimize
performance. 

Specifications

Features	WD Black 2.5", 7mm	WD Black 2.5",  9.5mm	WD Black 3.5"
Capacity	250GB - 500GB	1TB	500GB - 6TB
Interface	SATA 6b/s	SATA 6Gb/s	SATA 6Gb/s
RPM Class	7200	7200	7200

• WD Purple Surveillance HDD

Uncompromising Storage for 24/7, Always On Security Systems

Highlights

• Engineered specifically for surveillance security systems.
• Supports up to 360TB/yr workload rate.
• Tuned for write-intensive, low bit-rate, high stream-count applications typical to most surveillance applications.
• Prioritized write-operations for maximized surveillance performance.
• TLER & ATA streaming support.
• Support for more than eight bays

Specifications

Features	WD purple 7200 RPM	WD purple 5400 RPM
Form Factor	3.5"	3.5"
Interface	SATA 6 G/B	SATA 6 G?B