Cheapest 20 TB 3.5" hard drive
A 20 TB 3.5" hard drive is a high-capacity storage drive for desktops, NAS units, and servers. It uses the standard 3.5" form factor and connects over a SATA interface, so you get lots of room for media libraries, backups, and large project files. Before buying, check that your case or drive bay accepts 3.5" drives, that your board or enclosure offers a SATA connection, and that your system supports drives this large. On PartsPrices, you can compare 20 TB drives against other capacities and see which of the 61 devices in our catalog they fit.
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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
62 devices in our catalog take this part. Search yours on the home page.
Before you buy
- Match the form factor and interface first. This drive is 3.5" and SATA, so it suits most desktop towers and NAS enclosures with 3.5" bays but not slim laptops or slots meant for smaller 2.5" drives or M.2 SSDs.
- Think about speed expectations. As a spinning hard drive, it handles large sequential transfers well but can't match the responsiveness of an SSD, so many people pair one with a smaller SSD for the operating system and apps.
- Plan capacity and redundancy together. A single large drive stores a lot, but one failure can mean one large loss, so consider mirroring or backups if the data matters to you.
Questions
Will a 20 TB 3.5" hard drive fit my PC or NAS?
It fits any device with a 3.5" drive bay and a SATA connection. Start with the Devices section of the 20 TB 3.5" hard drive page on PartsPrices: it lists 61 devices from our catalog that accept this part, such as the ASUS PRIME B550-PLUS, ASRock B550M Pro4, ASUS ROG STRIX X670E-E GAMING WIFI, Dell OptiPlex 3000 Small Form Factor, and Synology DS224+. If your device isn't listed, check the manual for 3.5" bay support and SATA connectors.
How fast is a 20 TB 3.5" hard drive?
Hard drive speed depends on rotational speed and the interface, and models vary. In general, they're good for steady, large file transfers and bulk storage, but they boot and load applications more slowly than SSDs. For everyday responsiveness, a common setup is a smaller SSD for the system plus a large hard drive for storage.
Is a 20 TB 3.5" hard drive compatible with my motherboard?
Almost any desktop motherboard with SATA ports can run it, including boards like the ASUS PRIME B550-PLUS, ASRock B550M Pro4, ASUS TUF GAMING B550-PLUS WIFI II, and ASUS ROG STRIX B650E-F GAMING WIFI. Check that your BIOS supports large drives and that your case has a 3.5" bay. NAS enclosures such as the Synology DS224+ and Synology DS920+ are built for drives like this.
Should I buy a new or used hard drive?
New drives come with a warranty and a full expected lifespan. Used drives can save money, but they've already used up some of their life and you may not know how they were handled. If you go used, ask for any available health or usage information, and always keep a backup either way.
How much hard drive capacity do I need?
It depends on what you store. For documents and a modest photo library, a smaller drive may be plenty. Large video collections, game libraries, surveillance footage, and full system backups grow quickly, which is where 20 TB helps. We compare 4 TB, 8 TB, 12 TB, 16 TB, 20 TB, and 24 TB on PartsPrices so you can weigh capacity against cost.