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WL 4TB 64MB Cache 5400RPM SATA III (6.0Gb/s) 3.5" Internal Surveillance DVR Hard Drive - w/ 1 Year Warranty
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WL 4TB 64MB Cache 5400RPM SATA III (6.0Gb/s) 3.5" Internal Surveillance DVR Hard Drive - w/ 1 Year Warranty
  • Parts: 1 Year Warranty from Reseller
  • Labor: 1 Year Warranty from Reseller
  • Model #: WL4000GSA6454-PUR
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  • $129.99 
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Seagate Constellation ES ST32000444SS 2TB 7200 RPM 16MB Cache SAS 6Gb/s 3.5" Internal Enterprise Hard Drive Bare Drive
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Seagate Constellation ES ST32000444SS 2TB 7200 RPM 16MB Cache SAS 6Gb/s 3.5" Internal Enterprise Hard Drive Bare Drive
  • Brand: Seagate
  • Series: Constellation ES
  • Model: ST32000444SS
  • Capacity: 2TB
  • Model #: ST32000444SS
Western Digital RE4 WD1003FBYX 1 TB 3.5' Internal Hard Drive
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Western Digital
Western Digital RE4 WD1003FBYX 1 TB 3.5' Internal Hard Drive
  • Parts: 5 Year Limited
  • Model #: WD1003FBYX-01Y7B1
Seagate Cheetah 15K.7 ST3300657SS 300GB 15000 RPM SAS 6Gb/s 3.5" Internal Hard Drive
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Seagate Cheetah 15K.7 ST3300657SS 300GB 15000 RPM SAS 6Gb/s 3.5" Internal Hard Drive
  • Average Seek Time: 3.4ms
  • Average Write Time: 3.9ms
  • Average Latency: 2ms
  • NAND Flash Memory Type: Server
  • Model #: ST3300657SS
Seagate SKYHAWK AI 16TB SATA 6.0Gb/s Internal Hard Drive ST16000VE002
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Seagate SKYHAWK AI 16TB SATA 6.0Gb/s Internal Hard Drive ST16000VE002
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST16000VE002
WD Purple 8TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 128MB Cache 3.5 Inch WD80PURZ
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Used - Very Good 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
WD Red Plus 6TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 64MB Cache, 3.5 Inch - WD60EFRX
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WD Red Plus 6TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 64MB Cache, 3.5 Inch - WD60EFRX
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD60EFRX
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Seagate 1TB Enterprise Capacity 2.5 Internal Hard Disk Drive SATA 6.0Gb/s 7200 RPM 128MB Cache Model ST1000NX0423
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Seagate
Seagate 1TB Enterprise Capacity 2.5 Internal Hard Disk Drive SATA 6.0Gb/s 7200 RPM 128MB Cache Model ST1000NX0423
  • Average Latency: 4.16ms
  • Features: Design Small and Deliver BIG - 2.5-Inch Nearline Drive - Up to 2TB capacity in 15mm z-height, 2.5-inch form factor for space-constrained data centers - Designed for high-density storage solutions requiring environmentally sound low power consumption and low weight for maximum storage efficiency - Choose 12Gb/s SAS for high data integrity, scalability and
  • Usage: For Enterprise Storage
  • Height (maximum): 15mm
  • Model #: ST1000NX0423
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HGST Ultrastar 7K4000 HUS724040ALE640 (0F14683) 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Enterprise Hard Drive Bare Drive
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ST6000NM0095 Seagate 6TB 7.2K RPM SAS 12Gbps 3.5" 256MB Internal Hard Drive
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Seagate
Refurbished ST6000NM0095 Seagate 6TB 7.2K RPM SAS 12Gbps 3.5" 256MB Internal Hard Drive
  • Average Seek Time: 4.16 ms
  • Part Number: ST6000NM0095
  • Parts: 30 Days
  • Labor: 30 Days
  • Model #: ST6000NM0095-REF
  • $160.00
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  • $140.00 
  • Save: 12%
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Seagate Desktop HDD ST3000DM001 3TB 7200 RPM 64MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Seagate Desktop HDD ST3000DM001 3TB 7200 RPM 64MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Height (maximum): 26.11mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Model #: ST3000DM001
Western Digital Ultrastar 8TB DC HC320 7200 RPM SATA 6.0Gb/s 3.5" Data Center Internal Hard Drive - 0B36452/0B36404
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Western Digital Ultrastar 8TB DC HC320 7200 RPM SATA 6.0Gb/s 3.5" Data Center Internal Hard Drive - 0B36452/0B36404
  • Average Seek Time: 8ms
  • Average Write Time: 8.6ms
  • Average Latency: 4.16ms
  • Height (maximum): 26.10mm
  • Model #: 0B36404
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WD Black 1TB Performance Desktop Hard Disk Drive - 7200 RPM SATA 6Gb/s 64MB Cache 3.5 Inch - WD1003FZEX
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WD Black 1TB Performance Desktop Hard Disk Drive - 7200 RPM SATA 6Gb/s 64MB Cache 3.5 Inch - WD1003FZEX
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD1003FZEX
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Seagate BarraCuda ST16000DM001 16TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Seagate BarraCuda ST16000DM001 16TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Recording Technology: CMR
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST16000DM001
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Seagate Exos 7E10 ST10000NM017B 10TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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Seagate Exos 7E10 ST10000NM017B 10TB 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 #: ST10000NM017B
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Seagate Exos X16 16TB Enterprise HDD 12Gb/s SAS 512e/4Kn 7200 RPM 256MB Cache 3.5" Internal Hard Drive ST16000NM002G - OEM
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WD Purple WD33PURZ 3 TB Hard Drive 3.5" Internal SATA SATA/600 5400rpm
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WD Se WD4000F9YZ 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Datacenter Capacity HDD Bare Drive
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WD Se WD4000F9YZ 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Datacenter Capacity HDD Bare Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD4000F9YZ
Seagate ST8000NM0075 1RM212-001 8TB 7.2K RPM 12Gb/s 3.5"SAS HDD Hard Drive-0 HRS
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  • $255.00 
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WD Gold 14TB Enterprise Class Hard Disk Drive - 7200 RPM Class SATA 6Gb/s 512MB Cache 3.5 Inch - WD142KRYZ
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WD Gold 14TB Enterprise Class Hard Disk Drive - 7200 RPM Class SATA 6Gb/s 512MB Cache 3.5 Inch - WD142KRYZ
  • Part Number: WD142KRYZ
  • Height (maximum): 1.03in
  • Width (maximum): 4.0in
  • Length (maximum): 5.79in
  • Model #: WD142KRYZ
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HGST Ultrastar He8 HUH728080ALE600 (0F25739) 8TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Helium Platform Enterprise Hard Disk Drives Bare Drive
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HGST Ultrastar He8 HUH728080ALE600 (0F25739) 8TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Helium Platform Enterprise Hard Disk Drives Bare Drive
  • Average Seek Time: 8.5ms
  • Average Write Time: 9ms
  • Average Latency: 4.16ms
  • Height (maximum): 26.10mm
  • Model #: 0F25739
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Seagate IronWolf ST6000VN001 6TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Seagate IronWolf ST6000VN001 6TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST6000VN001
Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive (ST18000NM003D)
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Seagate
Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive (ST18000NM003D)
  • Average Latency: 4.16ms
  • Recording Technology: CMR
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Model #: ST18000NM003D.
Seagate Exos Enterprise Capacity 3.5'' HDD 10TB (Helium) 7200 RPM SATA 6Gb/s 256MB Cache Hyperscale 512e Internal Hard Drive ST10000NM0016
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Seagate Exos Enterprise Capacity 3.5'' HDD 10TB (Helium) 7200 RPM SATA 6Gb/s 256MB Cache Hyperscale 512e Internal Hard Drive ST10000NM0016
  • Average Latency: 4.16ms
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST10000NM0016
Seagate EXOS X24 12TB SATA 6Gb/s ISE 3.5inch Hard drive - ST12000NM002H
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Seagate 2TB Enterprise Capacity 2.5 Internal Hard Disk Drive SAS 12Gb/s 7200 RPM 128MB Cache Model ST2000NX0433
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Seagate
Seagate 2TB Enterprise Capacity 2.5 Internal Hard Disk Drive SAS 12Gb/s 7200 RPM 128MB Cache Model ST2000NX0433
  • Height (maximum): 15mm
  • Width (maximum): 70.10mm
  • Length (maximum): 100.46mm
  • Parts: 5 Year
  • Model #: ST2000NX0433
Seagate Constellation ES.2 ST32000646NS 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Refurbished Seagate Constellation ES.2 ST32000646NS 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Average Seek Time: 8.5ms
  • Average Write Time: 9.5ms
  • Average Latency: 4.16ms
  • Windows Vista: Works with Windows Vista
  • Model #: ST32000646NS
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  • $65.00 
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Seagate ST18000NM004J Exos X18 ST18000NM004J 18 TB Hard Drive - Internal - SAS (12Gb/s SAS)
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Seagate
Refurbished Seagate ST18000NM004J Exos X18 ST18000NM004J 18 TB Hard Drive - Internal - SAS (12Gb/s SAS)
  • Part Number: ST18000NM004J
  • NAND Flash Memory Type: SLC
  • Parts: 30 Days
  • Labor: 30 Days
  • Model #: ST18000NM004J
WD Black 8TB Performance Internal Hard Drive 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" - WD8001FZBX
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WD Black 8TB Performance Internal Hard Drive 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" - WD8001FZBX
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 26.10mm
  • Width (maximum): 101.60mm
  • Length (maximum): 147.00mm
  • Model #: WD8001FZBX
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  • $474.45 
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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