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HGST/WD Ultrastar 4TB 7200 RPM 512e SATA 6Gb/s 3.5-Inch Enterprise Hard Drive (HUS726T4TALE6L4)
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HGST/WD Ultrastar 4TB 7200 RPM 512e SATA 6Gb/s 3.5-Inch Enterprise Hard Drive (HUS726T4TALE6L4)
  • Usage: For Enterprise Storage
  • Height (maximum): 26.10mm
  • Model #: HUS726T4TALE6L4
Seagate ST10000NM0146 Enterprise 10TB SATA 3.5" Internal Hard Drive
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Seagate ST10000NM0146 Enterprise 10TB SATA 3.5" Internal Hard Drive
  • Average Latency: 4.16ms
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST10000NM0146
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  • $350.00 
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Seagate ST2000VX015 3.5 in. 256 MB & 2TB Skyhawk Surveillance Internal Hard Drive HDD
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Seagate
Seagate ST2000VX015 3.5 in. 256 MB & 2TB Skyhawk Surveillance Internal Hard Drive HDD
  • NAND Flash Memory Type: SLC
  • Features: ImagePerfect firmware is designed to ensure seamless video footage capture in 24x7 surveillance workloads1 that record video from 64 HD cameras. SkyHawk Health Management actively helps protect your surveillance storage by focusing on prevention, intervention, and recovery options. Included is RAID RapidRebuild, which provides 3x faster volume rebuilds over traditional RAID
  • Usage: For Video Surveillance
  • Model #: ST2000VX015
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HP 801888-B21 4TB 7200 RPM SATA 6.0Gb/s 3.5" Non-hot Plug Standard Internal Hard Drive Bare Drive
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HP 801888-B21 4TB 7200 RPM SATA 6.0Gb/s 3.5" Non-hot Plug Standard Internal Hard Drive Bare Drive
  • NAND Flash Memory Type: Hard Drive
  • Average Latency: 6Gb/s
  • Features: Do you have non-mission critical applications that require economical high capacity and reliability hard disk drives? HP SATA Hard Drives are built for reliability and larger capacity needs for today's non-mission critical server applications and storage environments. These high-capacity drives provide the lowest $/GB, and the best price advantage for
  • Usage: Ideal for Servers
  • Model #: 801888-B21
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HP 718162-S21 1.2TB 10000 RPM SAS 6Gb/s 2.5" Internal Hard Drive Bare Drive
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HP
HP 718162-S21 1.2TB 10000 RPM SAS 6Gb/s 2.5" Internal Hard Drive Bare Drive
  • Average Latency: 6Gb/s
  • NAND Flash Memory Type: others
  • Model #: 718162-S21
Dell 401-ABHQ 2.4TB 10000 RPM SAS 12Gb/s 2.5" Internal Hard Drive
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HP 652589-B21 10000 RPM SAS 6Gb/s 2.5" SFF SC Enterprise Hard Drive
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HP 652589-B21 10000 RPM SAS 6Gb/s 2.5" SFF SC Enterprise Hard Drive
  • Height (maximum): 15.6 mm
  • Width (maximum): 75.7 mm
  • Length (maximum): 118.7 mm
  • Parts: 3 Year
  • Model #: 652589-B21
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Seagate Exos X18 ST18000NM000J 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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Seagate
Seagate Exos X18 ST18000NM000J 18TB 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): 26.10mm
  • Width (maximum): 101.85mm
  • Model #: ST18000NM000J
Dell 342-2340 3TB 7200 RPM Serial Attached SCSI 3.5" Internal Hard Drive Bare Drive
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  • $151.45
  •  
  • $140.09 
  • Save: 7%
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HP Midline 454146-B21 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
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HP Midline 454146-B21 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
  • Average Seek Time: 8.5ms
  • Average Latency: 3Gb/s
  • NAND Flash Memory Type: Hard Drive
  • Parts: 1 year limited
  • Model #: 454146-B21
WD Purple WD101PURZ 10TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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WD Purple WD101PURZ 10TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD101PURZ
Dell 400-AUWX - 2TB 3.5" SATA 7.2K 6Gb/s Non Hot-Swap Hard Drive
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Dell 1.20 TB Hard Drive - 2.5" Internal - SAS (12Gb/s SAS) Server Device Supported 10000 RPM Model 400-ATJL
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DELL
Dell 1.20 TB Hard Drive - 2.5" Internal - SAS (12Gb/s SAS) Server Device Supported 10000 RPM Model 400-ATJL
  • Average Latency: 12Gb/s
  • NAND Flash Memory Type: Hard Drive
  • Model #: 400-ATJL
4TB Seagate Enterprise 3.5 Inch SATA III 6Gb/s 7200RPM 256MB Cache Internal Hard Drive
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6TB Seagate 3.5 Inch SAS 12Gb/s 7200RPM 256MB Cache Internal Hard Drive
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Seagate
6TB Seagate 3.5 Inch SAS 12Gb/s 7200RPM 256MB Cache Internal Hard Drive
  • NAND Flash Memory Type: SLC
  • Model #: ST6000NM001B
WD Black 6TB Performance Desktop Hard Disk Drive - 7200 RPM SATA 6Gb/s 128MB Cache 3.5 Inch - WD6002FZWX
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WD Black 6TB Performance Desktop Hard Disk Drive - 7200 RPM SATA 6Gb/s 128MB Cache 3.5 Inch - WD6002FZWX
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD6002FZWX
  • $344.75
  •  
  • $284.45 
  • Save: 17%
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HP 781518-B21 1.2TB 10000 RPM SAS 12Gb/s 2.5" SFF SC Enterprise Hard Drive
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HP
HP 781518-B21 1.2TB 10000 RPM SAS 12Gb/s 2.5" SFF SC Enterprise Hard Drive
  • Features: This HP 1.2TB SAS 12Gb/s 10K RPM SFF 2.5" SC Enterprise Hard Drive is a superior storage solution. With some storage requirements escalating and others becoming more complex, factors such as flexibility, performance, increased reliability, greater density, security, scalability and accessibility are more critical than ever. Today's organizations consist of
  • Usage: For Enterprise Storage
  • Model #: 781518-B21
Western Digital Black WD1002FAEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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  •  
  • $57.00 
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HPE 2.40TB 2.5" SAS 10000rpm Internal Hard Drive R0Q57A
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HPE 2.40TB 2.5" SAS 10000rpm Internal Hard Drive R0Q57A
  • NAND Flash Memory Type: Others
  • Model #: R0Q57A
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HP Z Turbo Drive Dual Pro PCIe-4x4 NVMe Carrier
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HP
HP Z Turbo Drive Dual Pro PCIe-4x4 NVMe Carrier
  • Part Number: 56Q86AA
  • Features: HP Z Turbo Drive Dual Pro PCIe-4x4 NVMe Carrier
  • Model #: 56Q86AA
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 IronWolf 16TB NAS Hard Drive 7200 RPM 256MB Cache SATA 6.0Gb/s CMR 3.5" Internal HDD for RAID Network Attached Storage ST16000VN001
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Seagate IronWolf 16TB NAS Hard Drive 7200 RPM 256MB Cache SATA 6.0Gb/s CMR 3.5" Internal HDD for RAID Network Attached Storage ST16000VN001
  • NAND Flash Memory Type: Hard Drives
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST16000VN001,.
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Seagate EXOS X24 12TB SATA 6Gb/s ISE 3.5inch Hard drive - ST12000NM002H
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Seagate SkyHawk AI ST18000VE002 18TB 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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Seagate
Seagate SkyHawk AI ST18000VE002 18TB 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST18000VE002
  •  
  • $650.00 
  • Free Shipping
Seagate Enterprise Capacity 3.5" HDD 4TB 7200 RPM 512n SAS 12Gb/s 128MB Cache Secure Model Internal Hard Drive ST4000NM0065
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Seagate
Seagate Enterprise Capacity 3.5" HDD 4TB 7200 RPM 512n SAS 12Gb/s 128MB Cache Secure Model Internal Hard Drive ST4000NM0065
  • Average Latency: 4.16ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST4000NM0065
  •  
  • $229.45 
  • Free Shipping
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Hitachi GST Deskstar 7K2000 HDS722020ALA330 (0F10311) 2TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
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  • $220.00 
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WD Red Pro WD101KFBX 10TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive
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WD Red Pro WD101KFBX 10TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD101KFBX
WD Ultrastar DC HA210 1W10002 2TB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive
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Western Digital
WD Ultrastar DC HA210 1W10002 2TB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive
  • Average Latency: 4.2ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: 1W10002

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