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Seagate Guardian Series Internal Hard Drives

New from Seagate - the Guardian Series of 10TB hard drives with 3 different models. The BarraCuda Pro for standard desktop usage, the IronWolf for use in a NAS, and the SkyHawk for security and surveillance.

Find out more about the Seagate Guardian Series:

Hard Drives Featured Items

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WD Blue 1TB Desktop Hard Disk Drive - 7200 RPM SATA 6Gb/s 64MB Cache 3.5 Inch - WD10EZEX
WD Blue 1TB Desktop Hard Disk Drive - 7200 RPM SATA 6Gb/s 64MB Cache 3.5 Inch - WD10EZEX

  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD10EZEX
  • Item #: N82E16822236339
  • $89.99
  • | $64.99 (16 Offers)
  • Save: 28%
  • $5.99 Shipping
Seagate BarraCuda ST1000DM010 1TB 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive
Seagate BarraCuda ST1000DM010 1TB 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive

  • Height (maximum): 20.17mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Model #: ST1000DM010
  • Item #: N82E16822179010
  • $89.99
  • | $64.99 (7 Offers)
  • Save: 28%
  • $3.99 Shipping
WD Red 3TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch - WD30EFRX
WD Red 3TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch - WD30EFRX

  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD30EFRX
  • Item #: N82E16822236344
  • $159.99
  • | $134.99 (15 Offers)
  • Save: 16%
  • $5.99 Shipping
HGST Deskstar NAS 3.5" 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s High-Performance Hard Drive for Desktop NAS Systems Retail Packaging 0S03664 H3IKNAS40003272SN
HGST Deskstar NAS 3.5" 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s High-Performance Hard Drive for Desktop NAS Systems Retail Packaging 0S03664 H3IKNAS40003272SN

  • Height (maximum): 26.10mm
  • Width (maximum): 101.00mm
  • Length (maximum): 146.00mm
  • Model #: 0S03664
  • Item #: N82E16822145912
  • $249.99
  • | $189.99 (2 Offers)
  • Save: 24%
  • $5.99 Shipping
Seagate 4TB Expansion Portable External Hard Drive USB 3.0 Model STEA4000400 Black
Seagate 4TB Expansion Portable External Hard Drive USB 3.0 Model STEA4000400 Black

  • Form Factor: 2.5"
  • Dimensions: 0.82" x 3.15" x 4.61"
  • Weight: 0.52 lb.
  • Package Contents: Seagate Expansion drive 18-inch (45.72cm) USB 3.0 cable Quick start guide
  • Model #: STEA4000400
  • Item #: N82E16822178817
  • $249.99
  • | $149.99 (9 Offers)
  • Save: 40%
  • $5.99 Shipping
WD Red 4TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch - WD40EFRX
WD Red 4TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch - WD40EFRX

  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD40EFRX
  • Item #: N82E16822236599
  • $219.99
  • | $199.99 (16 Offers)
  • Save: 9%
  • $5.99 Shipping
  • $195.99 - $199.99
TOSHIBA DT01ACA300 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
TOSHIBA DT01ACA300 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive

  • Average Latency: 4.17ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: DT01ACA300
  • Item #: N82E16822149408
  • $139.99
  • | $99.99 (6 Offers)
  • Save: 29%
  • $5.99 Shipping
WD Red 2TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch - WD20EFRX
WD Red 2TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch - WD20EFRX

  • Height (maximum): 25.40mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD20EFRX
  • Item #: N82E16822236343
  • $129.99
  • | $114.99 (14 Offers)
  • Save: 12%
  • $5.99 Shipping
Seagate Expansion 5TB USB 3.0 3.5" Desktop External Hard Drive STEB5000100 Black
Seagate Expansion 5TB USB 3.0 3.5" Desktop External Hard Drive Black

  • Dimensions: 1.44" x 4.75" x 6.93"
  • Weight: 2.09 lbs.
  • Package Contents: Seagate Expansion drive 4-foot (120cm) USB 3.0 cable Power adapter Quick start guide
  • Model #: STEB5000100
  • Item #: N82E16822178742
  • $249.99
  • | $179.99 (6 Offers)
  • Save: 28%
  • $5.99 Shipping
Seagate Desktop HDD ST1000DM003 1TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
Seagate Desktop HDD ST1000DM003 1TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive

  • Height (maximum): 19.99mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Electrical Outlet Plug Type: Plug Type “A” (USA, Canada, Mexico, Japan)
  • Model #: ST1000DM003
  • Item #: N82E16822148840
  • $89.99
  • | $64.99 (10 Offers)
  • Save: 28%
  • Free Shipping
HGST Deskstar NAS H3IKNAS500012872SN (0S03835) 5TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" High-Performance Hard Drive for Desktop NAS Systems Retail Packaging
HGST Deskstar NAS H3IKNAS500012872SN (0S03835) 5TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" High-Performance Hard Drive for Desktop NAS Systems Retail Packaging

  • Height (maximum): 25.40mm
  • Width (maximum): 99.06mm
  • Length (maximum): 144.78mm
  • Model #: 0S03835
  • Item #: N82E16822145972
  • $299.99
  • | $269.99 
  • Save: 10%
  • $5.99 Shipping
Seagate 1TB Expansion Portable External Hard Drive USB 3.0 Model STEA1000400 Black
Seagate 1TB Expansion Portable External Hard Drive USB 3.0 Model STEA1000400 Black

  • Form Factor: 2.5"
  • Dimensions: 0.58" x 3.15" x 4.61"
  • Weight: 0.37 lb.
  • Package Contents: Seagate Expansion drive 18-inch (45.72cm) USB 3.0 cable Quick start guide 1-year limited warranty (AMER)
  • Model #: STEA1000400
  • Item #: N82E16822178744
  • $99.99
  • $74.99 (10 Offers)
  • Save: 25%
  • $9.99 Shipping
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Hard Drives

Hard drives are the central storage device for data on your computer. On it rests the documents you create, the music you listen to, the games you play and the video you view. You'll want to choose a drive which is optimized for your primary purpose.
There are a few main things to consider when selecting a hard drive: internal or external hard drive, connection type, speed and capacity. Whether you call it a Hard Drive, a Hard Disk, or an HDD, budget permitting, always go for the fastest drive you can. Speed of data access is measured using RPMs (revolutions per minute). Typical drives range from 5400 to 7200 ROM, with more and more 9600 RPM drive appearing on the scene. A faster rotational speed means greater performance, especially in games, but may cause greater heat and noise.
The capacity, measured in GB (gigabytes), should depend on your own storage requirements. A higher capacity drive will invariably cost more than a smaller drive, so a balance must usually be struck between capacity and cost.
The hard drive interface, whether it's IDE, SATA, or SCSI determine a drive's application: IDE and SATA for personal storage and SCSI for enterprise and mission critical storage. Please see our Internal Hard Drive Buying Guide for more information.

ATA/IDE

Whether you call it "Advanced Technology Attachment" or "Integrated Drive Electronics", the name given to it by Western Digital, this connection method has the drive controller integrated into the drive, rather than connected to the motherboard. They can communicate at up to 133 MB/s.

SATA 1.5 Gbit/s

First-generation SATA interfaces, also known as SATA/150 or unofficially as SATA 1, communicate at a rate of 150MB/s or 1.5 Gbit/s.

SATA 3.0 Gbit/s

Soon after SATA 1.5 Gbit/s introduction a number of shortcomings were observed. This feature, Native Command Queuing (NCQ), was adopted as an optional supported feature for SATA 1.5 Gbit/s and SATA 3.0 Gbit/s devices.
SATA 3.0 Gbit/s is designed to fall back to SATA 1.5 Gbit/s when in communication with these older devices. In practice, some older SATA controllers do not properly implement SATA speed negotiation. SATA cables are less expensive and more compact than for ATA.
With the introduction of SATA, convention ATA is sometimes called Parallel ATA (PATA), which refers to the method in which the data travels over the wires.

Cables and Connectors for SATA Devices

Connectors and Cables are the same for either generation. They are used on 3.5-in SATA hard disks for desktop and server computers and 2.5-in disks for laptop or small computers.

SCSI (Small Computer System Interface)

Actually a variety of interfaces ranging from Narrow SCSI at 40Mb/s to Ultra-640 SCSI at 5120Mb/s may be substantially more expensive than other connections, but it offers a wider range of connection and device possibilities. Frequently SCSI connections may be found in higher-speed disks, up to 15000 RPM.
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