Most Popular Internal Hard Drives on Amazon

A hard disk drive (hard disk, hard drive, HDD) is a non-volatile storage device for digital data. It features one or more rotating rigid platters on a motor-driven spindle within a metal case. Data is encoded magnetically by read/write heads that float on a cushion of air above the platters.

Hard disk manufacturers quote disk capacity in SI-standard powers of 1000, wherein a terabyte is 1000 gigabytes and a gigabyte is 1000 megabytes. With file systems that measure capacity in powers of 1024, available space appears somewhat less than advertised capacity.

The first HDD was invented by IBM in 1956. They have fallen in cost and physical size over the years while dramatically increasing capacity. Hard disk drives have been dominant device for secondary storage of data in general purpose computers since the early 1960s. They have maintained this position because advances in their areal recording density have kept pace with the requirements for secondary storage. Form factors have also evolved over time from large standalone boxes to today’s desktop systems mainly with standardized 3.5" form factor drives, and mobile systems mainly using 2.5" drives. Today’s HDDs operate on high-speed serial interfaces, i.e., Serial ATA (SATA) or Serial attached SCSI (SAS).

The presentation of an HDD to its host is determined by its controller. This may differ substantially from the HDDs native interface particularly in mainframes or servers.

Popular Manufacturers: Western Digital, Seagate

	Western Digital 2 TB Caviar Green SATA Intellipower 64 MB Cache Bulk/OEM Desktop Hard Drive WD20EARS List Price: $159.99 Price on Amazon.com: $119.99 Shipping: Free Standard Shipping (3-5 days) Model number: WD20EARS
	Seagate Barracuda 7200 1.5 TB 7200RPM SATA 3Gb/s 32MB Cache 3.5 Inch Internal Hard Drive ST31500341AS-Bare Drive List Price: $199.99 Price on Amazon.com: $79.99 Shipping: FREE with Super Saver Shipping Model number: ST31500341AS
	Western Digital Scorpio Blue 500 GB Bulk/OEM Hard Drive 2.5 Inch, 8 MB Cache, 5400 RPM SATA II WD5000BEVT List Price: $81.99 Price on Amazon.com: $54.99 Shipping: FREE with Super Saver Shipping Model number: WD5000BEVT
	Western Digital Caviar Blue 500 GB Bulk/OEM Hard Drive 3.5 Inch, 16 MB Cache, 7200 RPM SATA II WD5000AAKS List Price: $122.93 Price on Amazon.com: $44.95 Shipping: FREE with Super Saver Shipping Model number: WD5000AAKS
	Western Digital 2 TB Caviar Black SATA 7200 RPM 64 MB Cache Bulk/OEM Desktop Hard Drive WD2001FASS List Price: $320.99 Price on Amazon.com: $174.95 Shipping: FREE with Super Saver Shipping Model number: WD2001FASS
	Western Digital Caviar Black 1 TB Desktop Hard Drive (WD1002FAEX) List Price: $119.99 Price on Amazon.com: $89.99 Shipping: Free Standard Shipping (3-5 days) Model number: WD1002FAEX
	Western Digital 320 GB Scorpio Black SATA 7200 RPM 16 MB Cache Bulk/OEM Notebook Hard Drive WD3200BEKT List Price: $82.99 Price on Amazon.com: $59.99 Shipping: FREE with Super Saver Shipping Model number: WD3200BEKT
	Western Digital 1 TB Caviar Green SATA Intellipower 64 MB Cache Bulk/OEM Desktop Hard Drive WD10EARS List Price: $90.99 Price on Amazon.com: $64.99 Shipping: FREE with Super Saver Shipping Model number: WD10EARS
	Seagate Barracuda 7200 1 TB 7200RPM SATA 3Gb/s 32MB Cache 3.5 Inch Internal Hard Drive ST31000528AS-Bare Drive List Price: $135.99 Price on Amazon.com: $69.95 Shipping: FREE with Super Saver Shipping Model number: ST31000528AS

source: hddoctor