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WD10EARS Western Digital GREEN 1TB 5400RPM 3Gbps 3.5" SATA HDD Hard Drive
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Seagate Exos 20TB 7.2K RPM SATA 6Gb/s 3.5in Enterprise HDD ST20000NM002C
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9TH066-150 Dell 900GB 10K 6G 64MB 2.5" SAS Hard Drive ST9900805SS
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P05319-001 P02760-001 HPE 240GB 6Gbps Read Intensive 2.5" SATA Solid State Drive
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WD5003ABYX-18WERA0 Dell 500GB 7.2K SAS 6G LFF Hard Drive
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DELL CONSTELLATION PCH77 ST2000NM0033 2TB 7.2K RPM 6Gb/s 3.5"SATA HDD Hard Drive
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LOT OF 10 - HP 718292-001 718162-B21 1.2TB 10K RPM 6Gb/s 2.5" SAS Hard Drive
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W/estern Digital 80GB UDMA/100 7200RPM 2MB IDE Hard Drive - WD800BB
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Dell G14 1XZ231-150 1.8TB 10K RPM SAS 12Gb/s 512e 2.5" Hard Drive
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WD Ultrastar DC HC570 0F48155 22TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
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ST6000NM0034 Seagate 6TB 7.2K 12G 128MB 3.5in SAS Hard Drive 1HT27Z-001
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453KG DELL AL14SEB060N 600GB 10K RPM 12Gb/s SFF 2.5" SAS SERVER HDD Hard Drive
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400-AUQZ DELL 1.2TB 10K SAS 3.5" 12Gb HDD KIT FOR R640 R740 R740XD R940 C6420
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XY986 2TB 7200RPM SAS 2.5Inch Dell Hard Drive
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HGST Ultrastar 7K4000 HUS724030ALS640 3TB 7.2K RPM SAS 6Gb/s 64MB 3.5" HD
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ST2000NM0008 Seagate 2TB 7.2K 6Gb/s 128MB (512n) 3.5in SATA Hard Drive
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202V7 Dell WD4001FYYG Original 4TB 7.2K RPM 6Gb/s 3.5" SAS SERVER HDD Hard Drive
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ST4000NM0023 Seagate 9ZM270 4TB 7200RPM 6Gbps  3.5" SAS HDD Hard Drive
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Seagate
ST4000NM0023 Seagate 9ZM270 4TB 7200RPM 6Gbps 3.5" SAS HDD Hard Drive
  • Model #: ST4000NM0023-9ZM270-seagate-new-zerohrs

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:

Casey H.
7/21/2025 4:10:23 PM
My "Go To" for HDs

“ These are my "go to" drives for not only internal system drives, but also offloading external storage; using a 4 Bay USB 3.x Drive Cage. ”

Seagate BarraCuda ST4000DM004 4TB 5400 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives Bare Drive - OEM