Cheapest 8 TB 3.5" hard drive
An 8 TB 3.5" hard drive is a mechanical storage drive in the full-size desktop form factor. It stores operating systems, games, photo and video libraries, backups, and NAS data at a low cost per gigabyte. Before you buy, check three things: the 3.5" drive fits your drive bay, the interface (usually SATA) matches your motherboard or enclosure, and your device supports a drive of this capacity. PartsPrices compares prices and shows which of the 69 devices in our catalog it fits.
- Lowest new $312.99
- Lowest used or refurbished $59.99
- Lowest per TB $7.50
- Compared 3 products
| $/TB | Price | Capacity | Product | Condition | Store | Link |
|---|---|---|---|---|---|---|
| $7.50 | $59.99 | 8 TB | Seagate BarraCuda 8TB 3.5" HDD 3.5" HDD · SATA · 5400 rpm · SMR | Used | eBay US +2 | View deal |
| $31.25 | $249.99 | 8 TB | Seagate IronWolf 8TB 3.5" NAS HDD 3.5" HDD · SATA · 7200 rpm | Used | eBay US +2 | View deal |
| $38.50 | $307.99 | 8 TB | WD Red Plus 8TB 3.5" NAS HDD 3.5" HDD · SATA · 5640 rpm | Used | eBay US +2 | View deal |
| $39.12 | $312.99 | 8 TB | WD Red Plus 8TB 3.5" NAS HDD 3.5" HDD · SATA · 5640 rpm | New | eBay US +2 | View deal |
| $41.25 | $329.99 | 8 TB | Seagate IronWolf 8TB 3.5" NAS HDD 3.5" HDD · SATA · 7200 rpm | New | eBay US +2 | View deal |
Fits these devices
- ASUS PRIME B550-PLUS
- Synology DS224+
- Synology DS920+
- Dell OptiPlex 3000 Small Form Factor
- ASRock B550M Pro4
- ASUS ROG STRIX X670E-E GAMING WIFI
- ASUS ROG STRIX B650E-F GAMING WIFI
- ASUS TUF GAMING B550-PLUS WIFI II
- Dell OptiPlex 3070 Small Form Factor
- Dell OptiPlex 5070 Small Form Factor
- Dell PowerEdge R220
- ASUS ROG STRIX X870E-E GAMING WIFI
69 devices in our catalog take this part. Search yours on the home page.
Before you buy
- Measure before you order. A 3.5" drive needs a full-size bay — it will not fit in a laptop or most small-form-factor cases without a bay. Also check the bay depth and the height of the mounting caddy or tray, since drives with extra hardware or thicker housings can be a tight squeeze in compact enclosures.
- Match the drive to the job. A drive that spends its life in a NAS, RAID array, or always-on server is working harder than one used for occasional backups. If you're building a multi-drive array, choose drives that are designed for that kind of continuous, multi-drive environment and try to use identical drives in the array.
- Plan for growth and failures. Capacity tends to fill up faster than you expect, and every drive can eventually fail. Budget for the capacity you need now, leave room to add another drive later, and keep anything irreplaceable backed up somewhere else.
Questions
Will an 8 TB 3.5" hard drive fit and work in my device?
Physically, it fits any case, server, or enclosure with a free 3.5" drive bay — desktop towers and most multi-bay NAS units qualify, laptops and slim small-form-factor systems usually do not. Electronically, it needs a SATA connection and support for 8 TB drives. The device pages in our catalog show the sizes each device accepts; look up your model there before buying.
How fast is an 8 TB hard drive?
Hard drive speed depends mainly on how fast the platters spin and how the drive is used. For sequential work — copying large files, storing media libraries, or backups — a modern hard drive is perfectly comfortable. For random access, boot drives, and application loading, any SSD will feel much faster. Interface speed is rarely the bottleneck, so don't worry if your drive and port don't share the exact same SATA generation.
Should I buy a new or used hard drive?
New drives come with a full warranty and an unknown service life ahead of them, which matters for anything you care about. Used drives can be a good way to add bulk storage cheaply, but you are buying a drive with some hours on it and often little or no warranty left. If you go used, check the drive's reported health and power-on hours first, and never make a used drive the only copy of your data.
How much storage do I enough — is 8 TB plenty?
It depends on what you're storing. Documents and everyday applications take very little room; game installs, raw photos, and video footage grow quickly; and backups multiply whatever you already have. 8 TB is a comfortable size for a home media library, a backup target, or a modest NAS. If you expect your collection to keep growing, check the larger sizes we compare — 12 TB, 16 TB, 20 TB, and 24 TB — since filling fewer bays is usually cheaper than replacing smaller drives later.