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Seagate IronWolf ST18000VN000 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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Seagate
Seagate IronWolf ST18000VN000 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
  • Recording Technology: CMR
  • Height (maximum): 26.11mm
  • Width (maximum): 101.85mm
  • Length (maximum): 146.99mm
  • Model #: ST18000VN000
WL 120GB 8MB Cache 7200RPM SATA2 3.5" Internal Desktop Hard Drive (For PC/Mac, DELL, Compaq, HP, ASUS, IBM, eMachine, Gateway) - 1 Year Warranty
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  • $18.99 
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Seagate Cheetah 15K.6 ST3450856SS 450 GB 3.5' Internal Hard Drive
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Seagate
Seagate Cheetah 15K.6 ST3450856SS 450 GB 3.5' Internal Hard Drive
  • Average Latency: 6Gb/s
  • NAND Flash Memory Type: Enterprise
  • Parts: 1 yr
  • Labor: 1 yr
  • Model #: ST3450856SS
Seagate Cheetah ST3600057FC 600GB 15000 RPM 16MB Cache Fibre Channel 4Gb/s 3.5" Internal Hard Drive Bare Drive
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  • $126.23
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  • $84.19 
  • Save: 33%
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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
0-HOURS WD1002FBYS Western Digital 1TB 7.2K RPM 3Gb/s 3.5" SATA HDD Hard Drive
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  • $72.00 
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ST500NM0011 Seagate 9YZ162 500GB 7.2K RPM 6Gb/s 3.5"SATA HDD Hard Drive-(0 H0RS)
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ST2000NX0273 Seagate 2TB SAS 2.5" 7.2K 12Gb 128MB Dual Port Hot-Plug Hard Drive
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ST33000650SS Seagate 9SM260-090 ES.2 3TB 7200RPM 6Gbps 3.5" SAS Hard Drive
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Dell 400-AUSL - Dell 2.4TB 2.5" SAS 10K 12Gb/s Hard Drive
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DELL
Dell 400-AUSL - Dell 2.4TB 2.5" SAS 10K 12Gb/s Hard Drive
  • Average Latency: 6Gb/s
  • Model #: 400-AUSL
U738K ST31000424SS Dell 1TB 7200RPM 6Gbps NL 3.5"SAS HDD Hard Drive W/ZERO HOURS
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  • $83.88 
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Hitachi GST Deskstar 7K400 HDS724040KLSA80 400GB 7200 RPM 8MB Cache SATA 1.5Gb/s 3.5" Hard Drive Bare Drive
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Hitachi GST Deskstar 7K400 HDS724040KLSA80 400GB 7200 RPM 8MB Cache SATA 1.5Gb/s 3.5" Hard Drive Bare Drive
  • Average Seek Time: 8.5ms
  • Parts: 1 year limited
  • Labor: 1 year limited
  • Model #: HDS724040KLSA80
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  • $80.00 
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HPE ISS 870759-B21 900GB SAS 15K SFF SC DS HDD
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HPE ISS 870759-B21 900GB SAS 15K SFF SC DS HDD
  • NAND Flash Memory Type: Hard Drive
  • Parts: 3 Year
  • Model #: 870759-B21
49Y1840 49Y1836 49Y1839 IBM 300GB 10000RPM 6Gbps 2.5" SAS SERVER HDD Hard Drive
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Dell 1P7DP - 2TB 3.5" SAS 7.2K 6Gb/s HS Hard Drive
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DELL
Dell 1P7DP - 2TB 3.5" SAS 7.2K 6Gb/s HS Hard Drive
  • NAND Flash Memory Type: SLC
  • Usage: Ideal for Servers
  • Model #: 1P7DP
LOT OF 10-Dell 9W5WV ST91000640SS 1TB 7.2KRPM 6Gb/s 2.5"SAS SERVER HDD HardDrive
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  • $499.00 
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ST8000NM0075 8TB 7.2K RPM 12G 3.5" SAS HDD For Dell T620 T630 T640 T710
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  • $350.00 
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HDEAE02DAA51 Dell 300GB 15K SAS 6G SFF Hard Drive
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Seagate Enterprise Capacity 3.5 | ST8000NM0075 | 8TB 7200 RPM SAS 12Gb/s 256MB C
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  • $225.00 
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Dell 529FG 4TB 7200 RPM SAS 6Gb/s 3.5" Internal Hard Drive
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1GDV1 160GB 5400RPM SATA 2.5Inch Dell Hard Drive
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  • $25.49 
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Dell (9W5WV) 1TB 7.2K SAS 2.5" Hard Drive
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  • $38.00 
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C8S59A HPE 900GB 6G 2.5-inches 10000rpm SAS Dual Port HDD 730703-001
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HPE 300 GB Hard Drive 2.5" Internal SAS 12Gb/s SAS P40430B21
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DELL HT953 0HT953 ST3300655SS 300GB 15K 3.5" SAS HARD DRIVE
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  • $65.00 
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2TB Toshiba P300 7200RPM 256MB
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2TB Toshiba P300 7200RPM 256MB
  • Model #: HDWD320UZSVA
Dell G13 PYM8J 6TB 3.5" SAS 12Gb/s 7200RPM 512e 3.5" NearLine Hard Drive
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DELL
Dell G13 PYM8J 6TB 3.5" SAS 12Gb/s 7200RPM 512e 3.5" NearLine Hard Drive
  • Encryption: Encryption
  • Usage: Ideal for Servers
  • Model #: PYM8J
Dell Toshiba 2TB DT01ACA200 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" 6HFW3
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  • $99.00 
  • $11.00 Shipping
Seagate Exos 7E10 ST2000NM000B 2TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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Seagate
Seagate Exos 7E10 ST2000NM000B 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 #: ST2000NM000B
Apricorn Aegis Padlock ASSD-3PL256-480F 480 GB External Solid State Drive
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  • $388.99 
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Seagate Exos 7E10 ST2000NM001B 2 TB Hard Drive Internal SAS 12Gb/s SAS
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Seagate Exos 7E10 ST2000NM001B 2 TB Hard Drive Internal SAS 12Gb/s SAS
  • NAND Flash Memory Type: SLC
  • Parts: 5 Year
  • Model #: ST2000NM001B

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