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  •  SATA 6Gb/s, 5TB
  •  2X DRAM cache up to 128M...
  •  Designed for creative ...
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD5001FZWX
  • Item #: N82E16822236971
  • Return Policy: Standard Return Policy

Western Digital Western Digital Western Digital WD Blue 1TB Desktop Hard Disk Drive - 7200 RPM SATA 6Gb/s 64MB Cache 3.5 Inch - WD10EZEX
  (1,641)
  •  Ideal for Desktop PCs, e...
  •  Advanced Format Technolo...
  •  Up to 200K photos, 250K ...
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD10EZEX
  • Item #: N82E16822236339
  • Return Policy: View Return Policy

Seagate Seagate Seagate Seagate Desktop HDD ST1000DM003 1TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  (1,474)
  •  1TB, SATA 6Gb/s, 64MB
  •  Higher performance with ...
  •  Best for Desktop or all-...
  • Height (maximum): 19.99mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Parts: 1 Year
  • Model #: ST1000DM003
  • Item #: N82E16822148840
  • Return Policy: Standard Return Policy

  •  Storage for 1 to 8 bay N...
  •  NASware 3.0
  •  3D Active Balance Plus
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD30EFRX
  • Item #: N82E16822236344
  • Return Policy: Standard Return Policy

  •  Next-generation desktop ...
  •  Improved Architectural D...
  • Height (maximum): 26.1mm
  • Width (maximum): 101.6mm
  • Length (maximum): 147mm
  • Model #: WD2003FZEX
  • Item #: N82E16822236624
  • Return Policy: Standard Return Policy

Seagate Seagate Seagate Seagate Desktop HDD ST4000DM000 4TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  (374)
  •  4TB, SATA 6Gb/s, 64MB
  •  Higher performance with ...
  •  Best for Desktop or all-...
  • Height (maximum): 26.11mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Model #: ST4000DM000
  • Item #: N82E16822178338
  • Return Policy: View Return Policy

Seagate Seagate Seagate Seagate Desktop HDD ST2000DM001 2TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  (1,100)
  •  2TB, SATA 6Gb/s, 64MB
  •  Higher performance with ...
  •  Best for Desktop or all-...
  • Height (maximum): 26.11mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Parts: 1 Year
  • Model #: ST2000DM001
  • Item #: N82E16822148834
  • Return Policy: View Return Policy

Seagate Seagate Seagate Seagate Desktop HDD ST500DM002 500GB 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  (546)
  •  500GB, SATA 6Gb/s, 16MB
  •  Higher performance with ...
  •  Best for Desktop or all-...
  • Height (maximum): 19.99mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Parts: 2 Year
  • Model #: ST500DM002
  • Item #: N82E16822148767
  • Return Policy: View Return Policy

Seagate Seagate Seagate Seagate Desktop HDD ST3000DM001 3TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  (1,537)
  •  3TB, SATA 6Gb/s, 64MB
  •  Higher performance with ...
  •  Best for Desktop or all-...
  • Height (maximum): 26.11mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Electrical Outlet Plug Type: Plug Type “A” (USA, Canada, Mexico, Japan)
  • Model #: ST3000DM001
  • Item #: N82E16822148844
  • Return Policy: View Return Policy

  •  Maximum performance for ...
  •  Dual processor speed
  •  Rock-solid mechanical ...
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD5003AZEX
  • Item #: N82E16822236345
  • Return Policy: Standard Return Policy

Toshiba Toshiba Toshiba TOSHIBA DT01ACA300 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  (271)
  •  7200 RPM performance, 6G...
  •  For use in consumer and ...
  •  Halogen-free design and ...
  • Average Latency: 4.17ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: DT01ACA300
  • Item #: N82E16822149408
  • Return Policy: View Return Policy

Toshiba Toshiba Toshiba TOSHIBA DT01ACA200 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  (239)
  •  7200 RPM performance, 6G...
  •  For use in consumer and ...
  •  Halogen-free design and ...
  • Average Latency: 4.17ms
  • Height (maximum): 26.1 mm
  • Width (maximum): 101.6 mm
  • Length (maximum): 147 mm
  • Model #: DT01ACA200
  • Item #: N82E16822149407
  • Return Policy: View Return Policy

Western Digital Western Digital Western Digital Western Digital Blue WD2500AAKX 250GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  (198)
  •  Solid performance and re...
  •  Perfect for Desktop PCs
  • Height (maximum): 25.40mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD2500AAKX
  • Item #: N82E16822136771
  • Return Policy: View Return Policy

Western Digital Western Digital Western Digital WD Re 1TB Datacenter Capacity Hard Disk Drive - 7200 RPM Class SATA 6Gb/s 64MB Cache 3.5 inch WD1003FBYZ
  (19)
  •  1TB, SATA 6.0Gb/s, 64MB ...
  •  Designed for high-intens...
  •  Designed for durability ...
  • Average Seek Time: 8.9ms
  • Windows Vista: Works with Windows Vista
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Model #: WD1003FBYZ
  • Item #: N82E16822236525
  • Return Policy: View Return Policy

Seagate Seagate Seagate Seagate Hybrid Drive ST1000DX001 1TB MLC/8GB 64MB Cache SATA 6.0Gb/s NCQ 3.5" Desktop SSHD
  (310)
  •  Backed by a 5-year limit...
  •  Solid state speed for fa...
  •  Innovative use of solid ...
  • Average Seek Time: <8.5ms
  • Average Write Time: <8.5ms
  • Flash Memory Capacity: 8GB
  • NAND Flash Memory Type: MLC
  • Model #: ST1000DX001
  • Item #: N82E16822178381
  • Return Policy: Standard Return Policy

Western Digital Western Digital Western Digital WD Black 4TB Performance Desktop Hard Disk Drive - 7200 RPM SATA 6Gb/s 64MB Cache 3.5 Inch - WD4003FZEX
  (119)
  •  Next-generation desktop ...
  •  Improved Architectural D...
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD4003FZEX
  • Item #: N82E16822236622
  • Return Policy: View Return Policy

  •  Storage for 1 to 8 bay N...
  •  NASware 3.0
  •  3D Active Balance Plus
  • Height (maximum): 25.40mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD20EFRX
  • Item #: N82E16822236343
  • Return Policy: Standard Return Policy

Seagate Seagate Seagate Seagate Barracuda STBD2000101 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Retail Kit
  (240)
  •  Perfect for desktop perf...
  •  SATA 6.0Gb/s
  • Height (maximum): 22.23mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.05mm
  • Model #: STBD2000101
  • Item #: N82E16822148910
  • Return Policy: Standard Return Policy

Seagate Seagate Seagate Seagate NAS HDD ST2000VN000 2TB 64MB Cache SATA 6.0Gb/s Internal Hard Drive
  (99)
  •  For 1- to 8-bay NAS syst...
  •  High Drive reliability a...
  •  NAS Drive Compatibility ...
  • Height (maximum): 26.11mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Model #: ST2000VN000
  • Item #: N82E16822178391
  • Return Policy: Standard Return Policy

Western Digital Western Digital Western Digital WD Re 4TB Datacenter Capacity Hard Disk Drive - 7200 RPM Class SATA 6Gb/s 64MB Cache 3.5 inch WD4000FYYZ
  (33)
  •  4TB, SATA 6.0Gb/s, 64MB ...
  •  Designed for high-intens...
  •  Designed for durability ...
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD4000FYYZ
  • Item #: N82E16822236350
  • Return Policy: View Return Policy

Seagate Seagate Seagate Seagate SV35.6 ST1000VX000 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Surveillance Hard Drive Bare Drive
  (62)
  •  1TB-per-disk technology,...
  •  MTBF of >1M hours; AFR o...
  •  Optimized for 24x7 video...
  • Average Seek Time: <8.5ms
  • Average Write Time: <9.5ms
  • Height (maximum): 19.99mm
  • Width (maximum): 101.60mm
  • Model #: ST1000VX000
  • Item #: N82E16822148912
  • Return Policy: View Return Policy

Seagate Seagate Seagate Seagate ST310005N1A1AS-RK 1TB 7200 RPM 32MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Retail Kit
  (111)
  •  Perfect for desktop perf...
  • Height (maximum): 22.23mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.05mm
  • Electrical Outlet Plug Type: Plug Type “A” (USA, Canada, Mexico, Japan)
  • Model #: ST310005N1A1AS-RK
  • Item #: N82E16822148321
  • Return Policy: Standard Return Policy

Seagate Seagate Seagate Seagate Video ST2000VM003 2 TB 3.5" SATA 3Gb/s Internal Hard Drive
  (18)
  •  SATA 6Gb/s NCQ, 5900 RPM...
  •  Optimized for high-defin...
  •  Delivers up to 16 simult...
  • Average Latency: 5.1ms
  • Parts: 2 yrs from vendor
  • Labor: 2 yrs from vendor
  • Electrical Outlet Plug Type: Plug Type “A” (USA, Canada, Mexico, Japan)
  • Model #: ST2000VM003
  • Item #: N82E16822178271
  • Return Policy: Standard Return Policy

Toshiba Toshiba Toshiba TOSHIBA PH3300U-1I72 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Retail Kit
  (264)
  •  3TB, SATA 6Gb/s, 64MB, 7...
  •  Increased performance fo...
  •  Low power consumption wi...
  • Average Seek Time: 14ms
  • Height (maximum): 26.16mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.07mm
  • Model #: PH3300U-1I72
  • Item #: N82E16822149396
  • Return Policy: Standard Return Policy

Seagate Seagate Seagate Seagate SV35.6 ST2000VX000 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Surveillance Hard Drive Bare Drive
  (34)
  •  1TB-per-disk technology,...
  •  MTBF of >1M hours; AFR o...
  •  Optimized for 24x7 video...
  • Height (maximum): 26.11mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Electrical Outlet Plug Type: Plug Type “A” (USA, Canada, Mexico, Japan)
  • Model #: ST2000VX000
  • Item #: N82E16822148902
  • Return Policy: Standard Return Policy

Seagate Seagate Seagate Seagate Cheetah 15K.7 ST3300657SS 300GB 15000 RPM SAS 6Gb/s 3.5" Internal Hard Drive
  (9)
  •  300GB
  •  15000 RPM 16MB Cache
  •  SAS 6Gb/s
  • Average Seek Time: 3.4ms
  • Average Write Time: 3.9ms
  • Average Latency: 2ms
  • Height (maximum): 25.40mm
  • Model #: ST3300657SS
  • Item #: N82E16822148538
  • Return Policy: View Return Policy

Seagate Seagate Seagate Seagate Desktop HDD ST250DM000 250GB 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  (31)
  •  250GB, SATA 6Gb/s, 16MB
  •  Higher performance with ...
  •  Best for Desktop or all-...
  • Height (maximum): 19.99mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Parts: 1 yr
  • Model #: ST250DM000
  • Item #: N82E16822148765
  • Return Policy: View Return Policy

  • Overview
  • Popular Brands
  • Accessories
  • What to Look for
  • Hard Drive FAQ's

Internal Hard Drives

Internal hard drives are core components to any PC. They are also known as “mechanical hard drives” due to the mechanical system inside each drive. The internal setup of a hard drive is composed of an actuator arm and a read/write head, a stack of several spinning platters, and a spindle. The platters spin, allowing the read/write head to move to different parts of the platters to either read/write data using electromagnetism to either change polarity in sections of the platter when writing or to sense polarity when reading.

The primary use of an internal hard drive is to permanently store data. This does not mean that the data cannot be deleted; instead, it means that unlike RAM, which acts as temporary storage, an internal hard drive hold data permanently without requiring constant power. These hard drives are also mounted on the inside of a computer system and are necessary for the installation of an operating system for a computer. Internal hard drives are also known as hard disk drives (HDD). SSDs or solid state drives are often conflated with hard disk drives, but this is incorrect. SSDs serve a similar purpose but are not the same as an HDD.

With a couple of exceptions, Internal hard drives typically measure 3.5” or 2.5” wide, which make them perfectly sized for desktop and laptop installations respectively. Some desktop PC builders will still use 2.5” hard drives for space and aesthetic reasons. While internal hard drives are usually installed inside a computer case, they can also be mounted in an external hard drive enclosure to make the hard drive a portable storage device. For the budget conscious, Internal hard drives offer the most data storage capacity for the lowest spend of all the storage options, easily providing value with TB drives.

To connect to a motherboard, internal hard drives use a number of formats, including SCSI, ATA or SATA ports. Internal hard drives require external power to operate, but will maintain the stored date even after the power is turned off.

The most popular internal hard drive manufacturers from all over the globe have partnered with Newegg, allowing Newegg to offer its customers the best selection of SATA HDDs, internal hard drives, laptop hard drives, and TB hard drive accessories. Brands include: Western Digital, Seagate, HGST, Toshiba, and more. For all of your data storage needs, Newegg’s massive selection will make sure you find the internal hard drive for your gaming, business, and personal needs.

Different users require different equipment to achieve specific goals. That’s why you may need different accessories to increase performance of your internal hard drive, prevent damage to your HDD, or add extra functionality to your HDD.

Add More Ports and Functionality: If you’re building a home server or just need to add a lot of hard drives to your computer, then a hard drive controller card is the perfect solution if you have expansion slots to spare. Also, if you need to take advantage of unique connector formats, like SCSI, you may need a controller card because your motherboard may not natively support this format.

Keep Your HDD Cool: Everyone knows that heat puts a strain on machines. That’s why machines that create a lot of heat need ways to manage the temperature. Your HDD is no different. Fortunately, hard drive coolers exist to vent heat away from your important data.Make Your HDD Portable: An internal hard drive doesn’t have to stay that way. With a hard drive enclosure, you can mount your internal hard drive inside and then use it as an external hard drive. This makes it easy to take all of your files with you wherever you go instead of having to move them to a USB drive. So convenient!

Just because all hard drives store data does not mean they are all the same. Users’ needs are very specific, so HDD manufacturers have made specialized hard drives to address those needs. File servers can benefit from specialized server drives more than they can from gaming specialized drives and vice versa. Make sure you choose the drive that best matches your specific use case.

Also, make sure the internal hard drive is physically compatible with your system. Obviously, a 3.5” hard drive will not fit inside a laptop, which is designed to accommodate 2.5” hard drives. The inverse, however, is true and you can install a laptop hard drive in your desktop, using the proper adapters if your case doesn’t accommodate smaller sized drives natively. Just make sure that your motherboard has matching connectors as the HDD you purchase.

Finally, make sure the internal hard drive has enough storage capacity for your purposes. There’s nothing worse than running out of storage space when you need it most. For large amounts of data, consider buying multiple large 1TB internal hard drives.

Can I replace a hard drive?

A hard drive replacement is any storage drive that replaces another storage drive that may have malfunctioned, failed, or is obsolete. All hard drives will eventually fail. That failure is predicted by the mean time between failures (MTBF) that hard drives are rated by. When the hard drive approaches that measurement, it is a good idea to purchase a replacement hard drive.

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