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Western Digital Caviar Blue WD3200AAJS 320GB 7200 RPM 8MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Used - Like New Western Digital Caviar Blue WD3200AAJS 320GB 7200 RPM 8MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Average Seek Time: 8.9ms
  • Average Latency: 4.2ms
  • Height (maximum): 25.40mm
  • Width (maximum): 101.60mm
  • Model #: WD3200AAJS
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Seagate ST600MM0208 600 GB Internal Hard Drive - SAS - 10000rpm - 128 MB Buffer
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Seagate
Seagate ST600MM0208 600 GB Internal Hard Drive - SAS - 10000rpm - 128 MB Buffer
  • NAND Flash Memory Type: SLC
  • Usage: For Enterprise Storage
  • Parts: 5 Year
  • Model #: ST600MM0208
  • $55.00
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  • $50.00 
  • Save: 9%
  • Free Shipping
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Seagate BarraCuda ST1500DM003 1.5TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Seagate BarraCuda ST1500DM003 1.5TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Brand: Seagate
  • Series: BarraCuda
  • Model: ST1500DM003
  • Capacity: 1.5TB
  • Model #: ST1500DM003
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WD5003ABYX-18WERA0 Dell 500GB 7.2K SAS 6G LFF Hard Drive
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Western Digital WD Green WD10EARS 1TB 5400 RPM 64MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
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  • $28.74 
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ST4000NM0115 Seagate ENT 4TB 3.5" SATA 7.2K 6Gb/s Hard Drive
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Seagate
ST4000NM0115 Seagate ENT 4TB 3.5" SATA 7.2K 6Gb/s Hard Drive
  • Model #: ST4000NM0115-1YZ107-005-n-seagate-atp
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  • $195.00 
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Dell 12GYY 012GYY 4TB 7200 RPM 512n SAS 6Gb/s 64MB Cache 3.5" Hard Drive
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DELL
Dell 12GYY 012GYY 4TB 7200 RPM 512n SAS 6Gb/s 64MB Cache 3.5" Hard Drive
  • Average Latency: 6Gb/s
  • Usage: For Enterprise Storage
  • Model #: 12GYY
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0B24496 Dell 600GB 15K SAS 6G LFF Hard Drive
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Seagate Enterprise Capacity 3.5'' HDD 10TB (Helium) 7200 RPM SATA 6Gb/s 256MB Cache Standard 4Kn Internal Hard Drive ST10000NM0186
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Seagate
Seagate Enterprise Capacity 3.5'' HDD 10TB (Helium) 7200 RPM SATA 6Gb/s 256MB Cache Standard 4Kn Internal Hard Drive ST10000NM0186
  • Average Latency: 4.16ms
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST10000NM0186
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  • $379.45 
HGST Ultrastar He12 0F30141 12TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives Bare Drive
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HGST Ultrastar He12 0F30141 12TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives Bare Drive
  • Average Seek Time: 8ms
  • Average Write Time: 8.6ms
  • Average Latency: 4.16ms
  • Features: 12TB capacity in a standard 3.5-inch form factor PMR technology works with all capacity enterprise applications & environments Reliable, field-proven, 4th generation design Outstanding power efficiency (Watts/TB) Compared to 8TB Ultrastar air-filled drives: - 50% more capacity - 52% more power efficient (Watts/TB) - 25% more reliable SATA 6Gb/s and SAS 12Gb/s: - 12Gb/s SAS compatible with next gen
  • Model #: 0F30141
EG1200JEHMC HP 1.2-TB 12G 10K 2.5 DP SAS HDD
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  • $294.45 
HGST Deskstar NAS 3.5" 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s High-Performance Hard Drive for Desktop NAS Systems Retail Packaging
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HGST Deskstar NAS 3.5" 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s High-Performance Hard Drive for Desktop NAS Systems Retail Packaging
  • Average Latency: 6Gb/s
  • Height (maximum): 26.10mm
  • Width (maximum): 101.00mm
  • Length (maximum): 146.00mm
  • Model #: 0S03664
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Dell 3481G - Dell 200GB 2.5" SATA  6Gb/s Solid State Drive
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Western Digital RE3 WD7502ABYS 750GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Hard Drive Bare Drive
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Western Digital RE3 WD7502ABYS 750GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Hard Drive Bare Drive
  • Average Latency: 4.2ms
  • Parts: 5 years limited
  • Labor: 5 years limited
  • Model #: WD7502ABYS
WL 1TB 64MB Cache 5400RPM SATA III (6.0Gb/s) (Low Power & Heavy Duty) 3.5" Internal Hard Drive (NAS & CCTV DVR) - w/ 1 Year Warranty
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WL 1TB 64MB Cache 5400RPM SATA III (6.0Gb/s) (Low Power & Heavy Duty) 3.5" Internal Hard Drive (NAS & CCTV DVR) - w/ 1 Year Warranty
  • Parts: 1 Year Warranty from Reseller
  • Labor: 1 Year Warranty from Reseller
  • Model #: WL1000GSA6454-DVR
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  • $59.99 
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655710-B21 656108-001 HP 1TB 7.2K RPM 6Gbps 2.5" MDL SATA Hard Drive W/Caddy
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  • $69.95 
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R95FV DELL 600GB 10K SAS 2.5" 12Gb/s HDD KIT W/ TRAY
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WD Gold WD4004FRYZ 4 TB Hard Drive 3.5" Internal SATA SATA/600
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WD Gold WD4004FRYZ 4 TB Hard Drive 3.5" Internal SATA SATA/600
  • Brand: WD
  • Series: Gold
  • Capacity: 4TB
  • RPM: 7200 RPM
  • Model #: WD4004FRYZ
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WD Purple WD62PURZ 6TB 5640 RPM 128MB SATA 6.0Gb/s 3.5" Hard Drive
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WD Purple WD62PURZ 6TB 5640 RPM 128MB SATA 6.0Gb/s 3.5" Hard Drive
  • NAND Flash Memory Type: Hard Drive
  • Features: The Right Drive for the Job WD Purple drives have been engineered specifically for the extreme demands of high temperature, 24/7 surveillance systems. Performance You Can Trust From a worldwide leader in the storage industry, WD Purple is engineered for quality video playback when you need it most. Expand Your View to 64 WD Purple
  • Usage: For Video Surveillance
  • Height (maximum): 26.10mm
  • Model #: WD62PURZ
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Desktop internal hard drives store operating systems, system files, software and individual files. They can offer anywhere from 500GB of storage up to 8TB or more and come with a variety of interfaces. Although most internal drives are 3.5in., some devices use a smaller 2.5in. form factor. Smaller and larger physical sizes are rare but do exist. Also, consider the speed of the drive. Internal hard drives for desktop computers tend to run at 7,200 revolutions per minute (RPM) but faster read-write speeds minimize waiting time. Hard drives with speeds of up to 15,000 RPM are available. Finally, memory cache is the amount of memory that can be active at any given time. A larger cache is important if you work with multiple large files at once.

Improve Your Computer's Performance with a New Hard Drive

You might not be concerned about storage space when you buy a new PC, but the hard drive will fill will with files and software. A new desktop internal hard drive can replace an existing drive that has reached maximum capacity. Alternatively, if your motherboard has a spare bay, you can add a second or additional device to expand storage. An internal HDD for PCs is easy to install, has greater capacity and speed than an external device and comes with multiple storage options.

Store All Your Data with Large Capacity Drives

Every piece of software you install, every song you save, every video you download takes up storage space, which can slow down a computer. A 720p movie takes up approximately 8GB, while a 4k video can consume as much as 100GB of a desktop internal hard drive. Even the Windows 10 operating system requires 15GB. A 500GB hard drive can be useful for storing files while you're on the move before transferring them to a larger drive if you don't have a personal cloud device or portable hard drive. For everyday and ongoing storage, this size drive will quickly fill up. Desktop internal hard drives offer the storage of up to 16TB in some cases, providing plenty of space for software and files.

Ensure Compatibility by Choosing the Right Interface

The most commonly used standards for connecting a desktop internal hard drive to a motherboard are SATA and SAS. Determine the motherboard's interface and ensure that you match this when buying a new drive to ensure compatibility and to avoid having to use an adapter. Check the label off the drive you are replacing or look at the manufacturer guidelines for your motherboard.

Access Data Quicker with a Fast SATA Internal Hard Drive

The speed the disk platters spin determines how quickly information can be retrieved from the drive. It is common for external hard drives to have a speed of 5,000 RPM because this draws less power and makes minimal noise. Other hard drive designs have a speed of up to 15,000 RPM, depending on the model.

Bestselling Desktop Internal Hard Drives Reviews:

Keith V.
4/9/2026 4:20:16 PM
High Capacity Plug and Play Drive

“ SATA so it plugs right into my old media server ”

Seagate BarraCuda ST24000DM001 24TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
Perry K.
3/26/2026 7:05:57 AM
Seagate Barracuda 2TB Hard Drive

“ Received and installed new Seagate Hard Drive in older Dell Inspiron PC. ”

Seagate BarraCuda ST2000DM008 2TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive
Anonymous
1/17/2026 7:23:35 PM
Works great if not DOA

“ I initially purchased two drives to replace two old WD 6TB drives (one died before Xmas) in a WD NAS. ”

WD Red Plus 10TB NAS Hard Disk Drive - 7200 RPM Class SATA 6Gb/s, CMR, 512MB Cache, 3.5 Inch - WD100EFGX