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Seagate SkyHawk 4TB Surveillance Hard Drive 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive ST4000VX007
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Seagate SkyHawk 4TB Surveillance Hard Drive 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive ST4000VX007
  • Average Latency: 6Gb/s
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST4000VX007
WD Blue 2TB Desktop Hard Disk Drive - 5400 RPM SATA 6Gb/s 64MB Cache 3.5 Inch - WD20EARZ
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WD Blue 2TB Desktop Hard Disk Drive - 5400 RPM SATA 6Gb/s 64MB Cache 3.5 Inch - WD20EARZ
  • NAND Flash Memory Type: Computer Hardware
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD20EARZ
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WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ
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WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD40PURZ
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD40PURZ
WD Ultrastar DC HC530 14TB SATA 6Gb/s 3.5-Inch Data Center HDD - WUH721414ALE604 (0F31156)
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Refurbished WD Ultrastar DC HC530 14TB SATA 6Gb/s 3.5-Inch Data Center HDD - WUH721414ALE604 (0F31156)
  • Part Number: 0F31156
  • Features: Helium sealed, secure erase, power disable, TDMR
  • Usage: For Enterprise Storage
  • Parts: 5 Years Warranty
  • Model #: WUH721414ALE604-0F31156
Seagate BarraCuda ST3000DM008 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive
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Seagate BarraCuda ST3000DM008 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST3000DM008
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Seagate Enterprise Capacity 3.5'' HDD 4TB 7200 RPM 512e SAS 12Gb/s 128MB Cache Internal Hard Drive ST4000NM0125
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Seagate Enterprise Capacity 3.5'' HDD 4TB 7200 RPM 512e SAS 12Gb/s 128MB Cache Internal Hard Drive ST4000NM0125
  • Average Latency: 4.16ms
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Model #: ST4000NM0125
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WD Black 2TB Performance Desktop Hard Disk Drive - 7200 RPM SATA 6Gb/s 64MB Cache 3.5 Inch - WD2003FZEX
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Seagate Enterprise Capacity 3.5 HDD 6TB 7200 RPM 512e SATA 6Gb/s 128MB-Cache 3.5-Inch Hard Disk Drive (ST6000NM0024)
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Seagate Enterprise Capacity 3.5 HDD 6TB 7200 RPM 512e SATA 6Gb/s 128MB-Cache 3.5-Inch Hard Disk Drive (ST6000NM0024)
  • Average Latency: 4.16ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST6000NM0024
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Seagate BarraCuda ST1000DM010 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive
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Seagate BarraCuda ST1000DM010 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive
  • Average Latency: 6Gb/s
  • Height (maximum): 19.99mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST1000DM010
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Seagate (Recertified) Exos X 28TB Internal Hard Drive HDD - 3.5 In CMR SATA 6Gb/s, 7200 RPM, 512MB Cache, 2.5M MTBF (ST28000NM000C)
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WD Blue WD100EAGZ 10TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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WD Blue WD100EAGZ 10TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
  • Brand: WD
  • Series: Blue
  • Capacity: 10TB
  • RPM: 7200 RPM
  • Model #: WD100EAGZ
  • $471.40 - $477.54
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WD Blue 8TB Desktop Hard Disk Drive - 5640 RPM SATA 6Gb/s 256MB Cache 3.5 Inch - WD80EAAZ
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WD Blue 8TB Desktop Hard Disk Drive - 5640 RPM SATA 6Gb/s 256MB Cache 3.5 Inch - WD80EAAZ
  • Height (maximum): 1.03in
  • Width (maximum): 4.00in
  • Length (maximum): 5.79
  • Model #: WD80EAAZ
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Seagate IronWolf Pro 4TB NAS Hard Drive 7200 RPM 256MB Cache CMR SATA 6.0Gb/s 3.5" Internal HDD ST4000NE001
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in 30 days
Seagate IronWolf Pro 4TB NAS Hard Drive 7200 RPM 256MB Cache CMR SATA 6.0Gb/s 3.5" Internal HDD ST4000NE001
  • Average Latency: 4.16ms
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST4000NE001
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WD Purple Pro 12TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - WD122PURP
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WD Purple Pro 12TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - WD122PURP
  • Brand: WD
  • Series: Purple Pro
  • Capacity: 12TB
  • RPM: 7200 RPM
  • Model #: WD122PURP
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Seagate BarraCuda ST6000DM003 6TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Seagate BarraCuda ST6000DM003 6TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Average Latency: 6Gb/s
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST6000DM003
WD Purple 6TB 3.5" SATA Internal Hard Disk Drive WD64PURZ
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WD Purple 6TB 3.5" SATA Internal Hard Disk Drive WD64PURZ
  • Brand: Western Digital
  • Capacity: 6TB
  • RPM: 5400 RPM
  • Interface: SATA 6.0Gb/s
  • Model #: WD64PURZ
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Seagate 5TB BarraCuda 5400 RPM 128MB Cache SATA 6.0Gb/s 2.5" 15mm Laptop Internal Hard Drive ST5000LM000
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Seagate 5TB BarraCuda 5400 RPM 128MB Cache SATA 6.0Gb/s 2.5" 15mm Laptop Internal Hard Drive ST5000LM000
  • Height (maximum): 15mm
  • Width (maximum): 69.85mm
  • Length (maximum): 100.35mm
  • Model #: ST5000LM000,.
WD RE4 WD2003FYYS 2TB 7200 RPM 64MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
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WD RE4 WD2003FYYS 2TB 7200 RPM 64MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Parts: 5 Year
  • Model #: WD2003FYYS
  • $90.00 - $110.00
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WD Purple Pro 14TB 7200 RPM 512MB Cache SATA 3.5" Internal Hard Drive - WD142PURP
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WD Purple Pro 14TB 7200 RPM 512MB Cache SATA 3.5" Internal Hard Drive - WD142PURP
  • Brand: WD
  • Series: Purple Pro
  • Capacity: 14TB
  • RPM: 7200 RPM
  • Model #: WD142PURP
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Seagate ST6000NM0115 6TB 7200 RPM SATA 6GB/s 512e Exos 7E8 256MB Cache 3.5-inch Hard Drive
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Seagate ST6000NM0115 6TB 7200 RPM SATA 6GB/s 512e Exos 7E8 256MB Cache 3.5-inch Hard Drive
  • NAND Flash Memory Type: SLC
  • Average Latency: 4.16ms
  • Features: Enterprise Drive for Bulk Data Applications Exos 7E8 hard drives support up to 8TB per drive, offering bulk data storage for data centerin frastructures requiring a highly reliable enterprise hard drive. Exos 7E8 provides cost-effective, reliable access to unstructured data. Built on field-proven 9th-generation conventional magnetic recording (CMR) technology, the Exos
  • Usage: For Enterprise Storage
  • Model #: ST6000NM0115
WD WD43PURZ 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43URZ
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WD WD43PURZ 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43URZ
  • Height (maximum): 26.1mm
  • Width (maximum): 101.6mm
  • Length (maximum): 147mm
  • Model #: WD43PURZ
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WD Purple 2TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD20PURZ
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WD Purple 2TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD20PURZ
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD20PURZ
Seagate BarraCuda ST1000DM010 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive
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Seagate BarraCuda ST1000DM010 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive
  • Height (maximum): 19.99mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST1000DM010
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HGST Ultrastar 7K4000 HUS724040ALA640 (0F14688) 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Hard Drive Bare Drive
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HGST Ultrastar 7K4000 HUS724040ALA640 (0F14688) 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Hard Drive Bare Drive
  • Average Seek Time: 8ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: 0F14688
Seagate Exos 7E8 ST6000NM021A 6TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drive, 512e
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Seagate
Seagate Exos 7E8 ST6000NM021A 6TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drive, 512e
  • Average Latency: 4.16ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST6000NM021A
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Seagate Desktop HDD ST2000DM001 2TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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in 30 days
Seagate Desktop HDD ST2000DM001 2TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Average Latency: 6Gb/s
  • Height (maximum): 26.11mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Model #: ST2000DM001
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Seagate Exos 7E8 ST8000NM000A 8TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives Bare Drive
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Seagate Exos 7E8 ST8000NM000A 8TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives Bare Drive
  • NAND Flash Memory Type: Hard Drive
  • Average Latency: 4.16ms
  • Features: Enterprise Drive for Bulk Data Applications Exos 7E8 hard drives support up to 8TB per drive, offering bulk data storage for data center infrastructures requiring a highly reliable enterprise hard drive. Exos 7E8 provides cost-effective, reliable access to unstructured data. Built on field-proven 10th-generation conventional magnetic recording (CMR) technology, the Exos
  • Usage: For Enterprise Storage
  • Model #: ST8000NM000A
Seagate Constellation CS ST3000NC002 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Internal Hard Drive Bare Drive
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  • $90.00 
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Seagate ST6000DX000 6TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Seagate ST6000DX000 6TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Average Seek Time: <8.5 µs typical
  • Average Write Time: <9.5 µs typical
  • Average Latency: 4ms
  • Height (maximum): 1.03"
  • Model #: ST6000DX000
Seagate IronWolf ST2000VN004 2TB 5900 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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Seagate
Seagate IronWolf ST2000VN004 2TB 5900 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
  • Average Seek Time: <12.0ms
  • Average Write Time: <12.0ms
  • Average Latency: 5.1ms
  • Height (maximum): 20.20mm
  • Model #: ST2000VN004
  •  
  • $189.10 
  • Free Shipping
WD Red Pro 22TB NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 512 MB Cache, 3.5" - WD221KFGX
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  • $979.57 - $989.46
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WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - WD181PURP
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WD Purple Pro 18TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - WD181PURP
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD181PURP
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Seagate Exos X16 ST14000NM005G 14TB 7.2K RPM SATA 6Gb/s 512e CMR 3.5in Enterprise HDD
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Seagate
Refurbished Seagate Exos X16 ST14000NM005G 14TB 7.2K RPM SATA 6Gb/s 512e CMR 3.5in Enterprise HDD
  • Height (maximum): 25.4mm
  • Width (maximum): 101.6mm
  • Length (maximum): 147.32mm
  • Model #: ST14000NM005G
  •  
  • $338.50 
  • Free Shipping
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WD Red Plus 1TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 64MB Cache, 3.5 Inch - WD10EFRX
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WD Red Plus 1TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 64MB Cache, 3.5 Inch - WD10EFRX
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD10EFRX
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Seagate 4TB Enterprise Hard Disk Drive - 7200 RPM SAS 12Gb/s 128MB 3.5" ST4000NM0034
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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:

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
1/22/2026 4:08:37 PM
Perfect 28TB NAS Drives Great For UGREEN Plex

“ One drive is my primary Plex/media volume, the other is my internal backup. ”

Seagate IronWolf Pro ST28000NT000 28TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive