Fresh/Last checked Jul 04, 02:25 AM·Updated daily
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Best NAS Hard Drives by Price per TB

Filling a NAS is where price per TB compounds: four or more bays multiply every dollar saved per terabyte. This list ranks today's new internal hard drive offers by price per TB — new only, because drives that run 24/7 in an array deserve full warranties.

The ranking re-computes on every snapshot refresh, and each entry shows how the offer compares against typical pricing for its capacity class, so you can time multi-drive purchases to genuine dips.

  1. Western Digital Internal Hard Drives 18Tb DC HC550 Surveillance,Wd 3.5 HDD Sata 6Gb/s 7200 PRM NAS 512 mb Cache for Dvr Nvr

    $469.99 · $26.11/TB as of Jul 04, 02:25 AM

    Ranks #1 at $26.11/TB — 47% below the typical 18TB HDD. New condition, SATA.

  2. Seagate BarraCuda Internal Hard Drive 8TB SATA 6Gb/s 256MB Cache 3.5-Inch (ST8000DM004),Mechanical Hard Disk

    $250.00 · $31.25/TB as of Jul 04, 02:25 AM

    Ranks #2 at $31.25/TB — 26% below the typical 8TB HDD. New condition, SATA, 3.5".

  3. MDD MAXDIGITALDATA (MDD4000GSA6472 4TB 7200RPM 64MB Cache SATA 6.0Gb/s 3.5inch Internal Desktop Hard Drive (for Desktop PC, Mac, CCTV DVR, Surveillence, Server, NAS)

    $129.99 · $32.50/TB as of Jul 04, 02:25 AM

    Ranks #3 at $32.50/TB — 32% below the typical 4TB HDD. New condition, SATA, 3.5".

  4. HGST Ultrastar He8 Helium 6TB 3.5-Inch 7200RPM SATA ULTRA 512e SE 128MB Cache Internal Bare or OEM Hard Drive - HUH728060ALE604 / 0F23669

    $199.00 · $33.17/TB as of Jul 04, 02:25 AM

    Ranks #4 at $33.17/TB — 33% below the typical 6TB HDD. New condition, SATA, 3.5".

  5. Seagate Enterprise Capacity 3.5 HDD 8TB 7200 RPM SATA 6Gb/s 256MB Cache 4Kn 3.5-Inch Enterprise Hard Disk Drive (ST8000NM0045)

    $279.02 · $34.88/TB as of Jul 04, 02:25 AM

    Ranks #5 at $34.88/TB — 17% below the typical 8TB HDD. New condition, SATA, 3.5".

  6. Seagate IronWolf 12TB NAS Internal Hard Drive HDD – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 256MB Cache for RAID Network Attached Storage (ST12000VNZ008/ST12000VN0008)

    $429.99 · $35.83/TB as of Jul 04, 02:25 AM

    Ranks #6 at $35.83/TB — 27% below the typical 12TB HDD. New condition, SATA, 3.5".

  7. Seagate IronWolf Pro 24TB Enterprise NAS Internal HDD Hard Drive – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 512MB Cache for RAID Network Attached Storage, Rescue Services (ST24000NT002)

    $859.99 · $35.83/TB as of Jul 04, 02:25 AM

    Ranks #7 at $35.83/TB — 27% below the typical 24TB HDD. New condition, SATA, 3.5".

  8. Seagate Skyhawk AI 20TB Video Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 512MB Cache for DVR NVR Security Camera System with in-House Rescue Services (ST20000VE003)

    $719.99 · $36.00/TB as of Jul 04, 02:25 AM

    Ranks #8 at $36.00/TB — 26% below the typical 20TB HDD. New condition, SATA, 3.5".

  9. Seagate IronWolf Pro, 20 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage (ST20000NT001)

    $719.99 · $36.00/TB as of Jul 04, 02:25 AM

    Ranks #9 at $36.00/TB — 26% below the typical 20TB HDD. New condition, SATA, 3.5".

  10. Seagate IronWolf Pro 28TB Enterprise NAS Internal HDD Hard Drive – CMR 3.5 Inch SATA 6Gb/s 7200 RPM 512MB Cache for RAID Network Attached Storage, Rescue Services (ST28000NT000)

    $1,019.99 · $36.43/TB as of Jul 04, 02:25 AM

    Ranks #10 at $36.43/TB — 26% below the typical 28TB HDD. New condition, SATA, 3.5".

Compare live hard disk prices for all matching deals →

What to look for

CMR is non-negotiable for NAS. RAID rebuilds and parity writes are exactly the workload where SMR drives crawl and get dropped from arrays. NAS-branded lines are CMR; verify before buying anything else that tops the list.

Buy for the rebuild, not just the build. Bigger drives mean longer rebuild windows when one fails — pairing very large drives with single-parity RAID is a risk; budget for dual parity or backups accordingly.

Mixing capacities wastes space in most RAID setups, which truncate every drive to the smallest member. Buying all bays from one strong deal — the kind this page surfaces — beats accumulating mismatched bargains.

FAQ

Do I need NAS-specific drives for a NAS?

NAS-class drives add vibration compensation, 24/7-rated firmware, and 3-year warranties — worth it for arrays of 4+ drives. For a 1–2 bay home NAS, a quality CMR desktop drive is a reasonable economy.

Why does this list exclude renewed drives?

A NAS array multiplies the cost of one early failure across rebuild risk to the whole pool. New drives with full warranties are the sane default; renewed enterprise drives belong in arrays built deliberately around redundancy.

What capacity is the sweet spot for a NAS?

Whatever this ranking says today — the sweet spot moves. Historically the second-largest mainstream capacity tier offers the best price per TB, because the newest largest tier carries an early-adopter premium.

Should all NAS drives be the same model?

Same capacity matters for RAID efficiency; same model is debatable. Some builders deliberately mix manufacturing batches to avoid correlated failures. Matching capacity from this list across two orders a few weeks apart achieves both.