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BUFFALO OP-HD3.0T/4K-3Y 3TB SATA 3.0Gb/s 3.5" 4K Sector Optional Hard Drive for TeraStation
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BUFFALO OP-HD3.0T/4K-3Y 3TB SATA 3.0Gb/s 3.5" 4K Sector Optional Hard Drive for TeraStation
  • Parts: Manufacturers Limited Warranty: 3 Year / Parts Only
  • Model #: OP-HD3.0T/4K-3Y
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  • $174.25 
  • $10.35 Shipping
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Western Digital Blue WD1600AAJS 160GB 7200 RPM 8MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Used - Like New Western Digital Blue WD1600AAJS 160GB 7200 RPM 8MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Average Seek Time: 8.9ms
  • Average Latency: 4.2ms
  • NAND Flash Memory Type: Desktop
  • Parts: 2 Year Warranty from Reseller
  • Model #: WD1600AAJS
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Seagate NL35 ST3400832NS 400GB 7200 RPM 8MB Cache SATA 1.5Gb/s 3.5" 24x7 working Hard Drive Bare Drive
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Seagate NL35 ST3400832NS 400GB 7200 RPM 8MB Cache SATA 1.5Gb/s 3.5" 24x7 working Hard Drive Bare Drive
  • Average Seek Time: 8ms
  • Average Write Time: 9ms
  • Average Latency: 4.16ms
  • Parts: 5 years limited
  • Model #: ST3400832NS
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Seagate ST4000NM0014 4TB Enterprise Desktop Hard Disk Drive - 7200 RPM SAS 12Gb/s 128MB 3.5"
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Seagate
Seagate ST4000NM0014 4TB Enterprise Desktop Hard Disk Drive - 7200 RPM SAS 12Gb/s 128MB 3.5"
  • Average Latency: 4.16ms
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Length (maximum): 147.00mm
  • Model #: ST4000NM0014
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  • $242.19 
  • Free Shipping
Dell 6WCT7 - Dell 1.2TB 2.5" SAS 10K 12Gb/s Hard Drive
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DELL
Dell 6WCT7 - Dell 1.2TB 2.5" SAS 10K 12Gb/s Hard Drive
  • Average Latency: 6Gb/s
  • Model #: 6WCT7
Dell R3H6D - Dell 1.2TB 2.5" SAS 10K 12Gb/s Hard Drive
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DELL
Dell R3H6D - Dell 1.2TB 2.5" SAS 10K 12Gb/s Hard Drive
  • Average Latency: 6Gb/s
  • Model #: R3H6D
01AC598 01EJ027 01EJ029 IBM 1.8TB 10000RPM 12Gbps 2.5" SAS SERVER HDD Hard Drive
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Seagate Exos X20 ST20000NM003D 20TB 7200 RPM 256MB Cache SAS 12Gb/s 3.5" Internal Hard Drive, SED
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Seagate
Seagate Exos X20 ST20000NM003D 20TB 7200 RPM 256MB Cache SAS 12Gb/s 3.5" Internal Hard Drive, SED
  • Average Latency: 4.16ms
  • Recording Technology: CMR
  • Height (maximum): 26.10mm
  • Width (maximum): 101.85mm
  • Model #: ST20000NM003D
WD2500AAKX Western Digital M4HXR 250GB 7.2K RPM 3Gb/s 3.5" SATA HDD Hard Drive
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  • $36.88 
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WD3200AAKS Western Digital 320GB 7.2K RPM 3Gb/s 3.5" SATA DESKTOP HDD Hard Drive
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Western Digital XE WD3001BKHG 300GB 10K RPM 6Gb/s 2.5" SAS HDD Hard Drive
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  •  
  • $48.88 
  • Free Shipping
Toshiba MK2576GSX 250 GB 2.5' Internal Hard Drive
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Toshiba MK2576GSX 250 GB 2.5' Internal Hard Drive
  • NAND Flash Memory Type: Hard Drive
  • Height (maximum): 9.5mm
  • Width (maximum): 69.85mm
  • Length (maximum): 100mm
  • Model #: MK2576GSX
0_HOURS WD5003ABYX Western Digital 500GB 7200RPM 3Gbps 3.5" SATA Hard Drive
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  •  
  • $52.88 
  • Free Shipping
WD4001ABYS Western Digital RE2 400GB 7200RPM 3Gbps 3.5" SATA HDD Hard Drive
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  • $39.88 
  • Free Shipping
0-HOURS Western Digital WD3200AAJS 320GB 7200RPM 3Gbps 3.5" SATA HDD Hard Drive
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  • $46.88 
  • Free Shipping
Seagate BarraCuda ST1000DM010 1TB 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive
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Seagate
Refurbished Seagate BarraCuda ST1000DM010 1TB 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive
  • NAND Flash Memory Type: SLC
  • Usage: For Daily Computing
  • Model #: ST1000DM010
WD6000HLHX Western Digital 600GB 10000RPM 6Gbps  2.5" SATA HDD Hard Drive
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  •  
  • $90.00 
  • Free Shipping
WD6000BLHX Western Digital VelociRaptor 600GB 10K 6G 32MB 2.5" SATA Hard Drive
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  •  
  • $106.88 
  • Free Shipping
WD800BEVT Western Digital PW059 BLUE 80GB 5400RPM 3Gbps 2.5" SATA HDD Hard Drive
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  • $45.91 
  • Free Shipping
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WD20NPVX Western Digital GREEN 2TB 5.4K RPM 6Gb/s 2.5" SATA HDD Hard Drive
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  • $198.88 
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WD AV WD5000AURX 500GB IntelliPower 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Used - Like New WD AV WD5000AURX 500GB IntelliPower 64MB 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 #: WD5000AURX
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  • $75.10 
  • Free Shipping
WD20EADS Western Digital GREEN 2TB 5.4K RPM 3Gb/s 3.5" SATA HDD Hard Drive
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  • $190.00 
  • Free Shipping
Seagate BarraCuda ST500DM009-25PK 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Hard Drive, 25-Pack
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Seagate
Seagate BarraCuda ST500DM009-25PK 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Hard Drive, 25-Pack
  • Height (maximum): 19.99mm
  • Width (maximum): 101.60mm
  • Length (maximum): 146.99mm
  • Model #: ST500DM009-25PK
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  • $1,245.00 
  • Free Shipping
Western Digital WD Green WD15EADS 1.5TB 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
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  • $48.10 
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Dell 2T51W 1 TB Hard Drive - 3.5" Internal - SATA (SATA/600)
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DELL
Dell 2T51W 1 TB Hard Drive - 3.5" Internal - SATA (SATA/600)
  • Average Latency: 6Gb/s
  • Usage: Ideal for Servers
  • Model #: 2T51W
Dell TMVN7 - Dell 2TB 2.5" Nearline SAS 7.2K 12Gb/s Hard Drive
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DELL
Dell TMVN7 - Dell 2TB 2.5" Nearline SAS 7.2K 12Gb/s Hard Drive
  • Usage: For Enterprise Storage
  • Parts: 30 DAYS WARRANTY
  • Labor: 30 DAYS WARRANTY
  • Model #: TMVN7
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Western Digital RE3 WD5002ABYS 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
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Refurbished Western Digital RE3 WD5002ABYS 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive
  • Average Latency: 4.2ms
  • Parts: 90 days limited
  • Labor: 90 days limited
  • Model #: WD5002ABYS
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  • $40.00 
  • Free Shipping
Maxtor MaXLine Pro 500 7H500F0 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Hard Drive Bare Drive
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Maxtor MaXLine Pro 500 7H500F0 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Hard Drive Bare Drive
  • Average Seek Time: 8.5ms
  • Average Latency: 4.17ms
  • Parts: 3 years limited
  • Labor: 3 years limited
  • Model #: 7H500F0

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