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WD Purple 8TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 128MB Cache 3.5 Inch WD80PURZ
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WD Purple 8TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 128MB Cache 3.5 Inch WD80PURZ
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD80PURZ
HP 507632-B21 2TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
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HP 507632-B21 2TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
  • Average Latency: 3Gb/s
  • NAND Flash Memory Type: others
  • Parts: 3 years limited
  • Labor: 3 years limited
  • Model #: 507632-B21
  • $126.58
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  • $110.00 
  • Save: 13%
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LOT OF 10 - Dell 55H49 ST3000NM0023 3TB 7.2K RPM 6Gb/s 3.5" SAS HDD Hard Drive
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  • $899.00 
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ST2000NM0001 Seagate 9YZ268-001 2TB 7200RPM 6Gbps 3.5" SAS HDD Hard Drive
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Seagate IronWolf Pro 4TB NAS Hard Drive 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive ST4000NE0025
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Seagate IronWolf Pro 4TB NAS Hard Drive 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive ST4000NE0025
  • Average Latency: 4.16ms
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST4000NE0025
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  • $265.00 
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Dell 161-BCBX 2.4TB SAS 12Gbps 10KRPM 512e 2.5in ISE Hot-Plug Hard Drive
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  • $341.55 
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BUFFALO TECHNOLOGY OP-HD8.0N 8TB SPARE REPL NAS HARD DRIVE 3010  5010
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Dell 6WCT7 - Dell 1.2TB 2.5" SAS 10K 12Gb/s Hard Drive
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DELL
Dell 6WCT7 - Dell 1.2TB 2.5" SAS 10K 12Gb/s Hard Drive
  • Average Latency: 6Gb/s
  • Model #: 6WCT7
Dell 0W347K W347K 600GB 15K 6Gbps 3.5" SAS HARD DRIVE ST3600057SS
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DELL
Dell 0W347K W347K 600GB 15K 6Gbps 3.5" SAS HARD DRIVE ST3600057SS
  • Parts: 30 days warranty
  • Labor: 30 days warranty
  • Model #: ST3600057SS
WD RE WD1003FBYX 1 TB 3.5" Internal Hard Drive
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PGHJG ST300MM0006 Dell 300GB 10K RPM 6Gb/s 2.5" SAS Hard Drive W/(ZERO HOURS)
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  • $44.00 
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FVX7C DELL 2TB 7.2K SAS 2.5" 12Gb/s HDD W/TRAY
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9ZM270-150 Dell 4TB 7.2K SAS 6G LFF Hard Drive
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4HGTJ DELL 600GB 15K SAS 2.5 HDD 12Gbps
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DELL
4HGTJ DELL 600GB 15K SAS 2.5 HDD 12Gbps
  • Model #: d9b-029351000252445
WL 3TB IntelliPower 64MB Cache SATA III (6.0Gb/s) 3.5" Internal Desktop Hard Drive (For PC/Mac/DVR) w/1 Year Warranty
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WL 3TB IntelliPower 64MB Cache SATA III (6.0Gb/s) 3.5" Internal Desktop Hard Drive (For PC/Mac/DVR) w/1 Year Warranty
  • Parts: 1 Year Warranty from Reseller
  • Labor: 1 Year Warranty from Reseller
  • Model #: WL3000GSA6454-S6
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  • $89.99 
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Seagate Exos 7E10 ST2000NM017B 2TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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Seagate
Seagate Exos 7E10 ST2000NM017B 2TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
  • Average Latency: 4.16ms
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Model #: ST2000NM017B
WD3000HLFS Western Digital VELOCIRAPTOR 300GB 10K 3G 16MB 3.5in SATA Hard Drive
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  • $56.88 
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DELL ENTERPRISE ACCESSORIES 400-AJQD 1.2TB SAS 12GBPS 2.5IN 10K RPM
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DELL
DELL ENTERPRISE ACCESSORIES 400-AJQD 1.2TB SAS 12GBPS 2.5IN 10K RPM
  • Average Latency: 12Gb/s
  • Usage: For Enterprise Storage
  • Model #: 400-AJQD
HUC101812CS4200  0B29920 HGST 1.2TB 10000RPM 12Gbps 2.5" SAS HDD Hard Drive
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Dell 400-AJQD 1.2TB 10000 RPM SAS 12Gb/s 2.5" Internal Hard Drive
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  • $85.00 
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ST500LM034 Seagate 2GH17A 500GB 7.2K RPM 6Gb/s 2.5" SATA Laptop HDD Hard Drive
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Dell 9W5WV ST91000640SS 1TB 7.2K 2.5" 6G SAS HARD DRIVE w/G176J
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Maxtor 4R080l0 80Gb 5400Rpm 2Mb Buffer Diamondmax16 Ata Ide Ultradma133 3.5Inch Low Profile (1.0Inch)Internal Hard Drive
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  • $90.24
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  • $75.00 
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MB4000JVYZQ HPE 4TB 12G MIDLINE 7.2K LFF SAS Hard Drive
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Seagate SV35.6 Series ST1000VX000 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Surveillance Hard Drive Bare Drive
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  • $69.10 
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Dell PX05SRB384Y XCRDV Dell 3.84TB 12Gb/s RI SAS SSD 2.5" Drive
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  • $675.00 - $1,400.00

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