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Seagate 4TB Enterprise Hard Disk Drive - 7200 RPM SAS 12Gb/s 128MB 3.5" ST4000NM0034
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Seagate ST14000NM0048 Exos X14 ST14000NM0048 14 TB Hard Drive - 3.5" Internal - SAS (12Gb/s SAS)
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Seagate
Refurbished Seagate ST14000NM0048 Exos X14 ST14000NM0048 14 TB Hard Drive - 3.5" Internal - SAS (12Gb/s SAS)
  • Part Number: ST14000NM0048
  • NAND Flash Memory Type: SLC
  • Parts: 30 Days
  • Labor: 30 Days
  • Model #: ST14000NM0048
Seagate SkyHawk ST8000VX010 8TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives
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Seagate SkyHawk ST8000VX010 8TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives
  • Height (maximum): 26.1mm
  • Width (maximum): 101.6mm
  • Length (maximum): 149.99mm
  • Model #: ST8000VX010
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Western Digital Purple Pro 10 TB Smart Video Internal HDD WD102PURP
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WD Blue PC Desktop HDD 8TB
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WD Blue PC Desktop HDD 8TB
  • Height (maximum): 1.03in
  • Width (maximum): 4.00in
  • Length (maximum): 5.79
  • Model #: WD80EAAZ
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WD Purple Pro WD122PURP 12TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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WD Purple Pro WD122PURP 12TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
  • Brand: WD
  • Series: Purple Pro
  • Capacity: 12TB
  • RPM: 7200 RPM
  • Model #: WD122PURP
  • $514.66 - $524.91
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WD Gold 14TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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WD Gold 14TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
  • Part Number: WD142KRYZ
  • Height (maximum): 1.03in
  • Width (maximum): 4.0in
  • Length (maximum): 5.79in
  • Model #: WD142KRYZ
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WD Red Pro WD4003FFBX 4TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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WD Red Pro WD4003FFBX 4TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • NAND Flash Memory Type: Hard Drives
  • Recording Technology: CMR
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Model #: WD4003FFBX
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
  • $110.00 - $119.95
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WD RE WD2000FYYZ 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Internal Hard Drive Bare Drive
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WD RE WD2000FYYZ 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Internal Hard Drive Bare Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD2000FYYZ
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Seagate Constellation ES.3 ST4000NM0023 4TB 7200 RPM 128MB Cache SAS 6Gb/s 3.5" Enterprise Internal Hard Drive Bare Drive
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Seagate Constellation ES.3 ST4000NM0023 4TB 7200 RPM 128MB Cache SAS 6Gb/s 3.5" Enterprise Internal Hard Drive Bare Drive
  • Average Latency: 4.16ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST4000NM0023
Seagate Archive HDD v2 ST8000AS0002 8TB 5900 RPM 128MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Seagate Archive HDD v2 ST8000AS0002 8TB 5900 RPM 128MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Height (maximum): 26.11mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Parts: 30 DAYS WARRANTY
  • Model #: ST8000AS0002
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Seagate SkyHawk ST4000VX016 4TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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Seagate SkyHawk ST4000VX016 4TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
  • Recording Technology: CMR
  • Height (maximum): 20.20mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST4000VX016
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WD Purple Pro 26TB 3.5" Surveillance Internal Hard Drive HDD - SATA 6 Gb/s - 512 MB Cache (WD260PURP)
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Western Digital
WD Purple Pro 26TB 3.5" Surveillance Internal Hard Drive HDD - SATA 6 Gb/s - 512 MB Cache (WD260PURP)
  • Brand: Western Digital
  • Series: Purple Pro
  • Model: WD260PURP
  • Capacity: 26TB
  • Model #: WD260PURP
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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 NAS HDD ST4000VN000 4TB 64MB Cache SATA 6.0Gb/s Internal Hard Drive
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Seagate NAS HDD ST4000VN000 4TB 64MB Cache SATA 6.0Gb/s Internal Hard Drive
  • Height (maximum): 26.11mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Model #: ST4000VN000
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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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WD Purple Pro WD8002PURP 8TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives Bare Drive
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WD Purple Pro WD8002PURP 8TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives Bare Drive
  • Part Number: WD8002PURP
  • Recording Technology: CMR
  • Model #: WD8002PURP
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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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Refurbished Seagate (Recertified) Exos X 28TB Internal Hard Drive HDD - 3.5 In CMR SATA 6Gb/s, 7200 RPM, 512MB Cache, 2.5M MTBF (ST28000NM000C)
  • Average Latency: 4.16ms
  • Part Number: ST28000NM000C
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Model #: ST28000NM000C
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WD Purple Pro WD121PURP 12TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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WD Purple Pro WD121PURP 12TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD121PURP
  • $510.00 - $535.00
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WD Purple 2TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD20PURX
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WD Purple 2TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch WD20PURX
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD20PURX
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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 Gold 10 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - 7200rpm WD103KRYZ
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WD Gold 10 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - 7200rpm WD103KRYZ
  • Brand: WD
  • Series: Gold
  • Capacity: 10TB
  • RPM: 7200 RPM
  • Model #: WD103KRYZ
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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
WD Purple WD33PURZ 3 TB Hard Drive 3.5" Internal SATA SATA/600 5400rpm
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Western Digital WD Green WD20EARX 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Seagate Enterprise NAS ST6000VN0001 6TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Seagate Enterprise NAS ST6000VN0001 6TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Average Latency: 4.16ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST6000VN0001
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  • $321.10 
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Seagate IronWolf Pro 8TB NAS Hard Drive 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive ST8000NE0004
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Seagate IronWolf Pro 8TB NAS Hard Drive 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive ST8000NE0004
  • Average Latency: 4.16ms
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST8000NE0004
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  • $599.10 
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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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Seagate IronWolf 8TB NAS Hard Drive 7200 RPM 256MB Cache SATA 6.0Gb/s CMR 3.5" Internal HDD for RAID Network Attached Storage ST8000VN0022
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Seagate IronWolf 8TB NAS Hard Drive 7200 RPM 256MB Cache SATA 6.0Gb/s CMR 3.5" Internal HDD for RAID Network Attached Storage ST8000VN0022
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST8000VN0022
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WD Purple Pro WD8001PURP 8TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives Bare Drive
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WD Purple Pro WD8001PURP 8TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives Bare Drive
  • Recording Technology: CMR
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD8001PURP
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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Seagate ST2000NM0055 2 TB 3.5" Internal Hard Drive - SATA - 7200rpm - 128 MB Buffer
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Seagate
Refurbished Seagate ST2000NM0055 2 TB 3.5" Internal Hard Drive - SATA - 7200rpm - 128 MB Buffer
  • Brand: Seagate
  • Series: Exos 7E8
  • Model: ST2000NM0055
  • Capacity: 2TB
  • Model #: ST2000NM0055

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