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Seagate Constellation.2 ST91000640NS Hard Drive

Seagate Constellation.2 ST91000640NS Hard Drive

Best price now

$44.29at eBayObserved at 2:25 AM

55% under what the other stores charge

Compared across 8 stores. Prices are checked against each store and labelled with when.

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Our take on the Seagate Constellation.2 ST91000640NS Hard Drive

The Seagate Constellation.2 ST91000640NS is a 2.5-inch enterprise hard drive: 1 TB, 7200 rpm, SATA, built for servers and storage arrays rather than laptops. Its appeal now is capacity per dollar for a small NAS, mini PC or older server that takes 2.5-inch drives. The best new price is $44.29 at eBay as of November 5, 2026, with 8 stores listing it new. That is near the low end of what this drive has cost recently, but it is a 2010-era design, so check age and warranty before buying.

Best forHome lab and small NAS builds that need cheap 2.5-inch bulk storageReplacing a failed drive in an existing server or arrayMini PCs and SFF desktops with a free 2.5-inch bayCold backup and archive copies
Pros
  • 1 TB in a 2.5-inch, 15 mm-tall enterprise form factor
  • 7200 rpm spindle gives solid sequential throughput for a 2.5-inch HDD
  • SATA interface works with almost any desktop, NAS or server board
  • Enterprise rating: 24/7 duty cycle and higher workload tolerance than laptop drives
  • Cheap per terabyte at $44.29
Cons
  • 15 mm height will not fit most laptops or slim bays
  • Old model: new stock may be aged or have short remaining warranty
  • Hard drive speeds and latency far behind any SSD
  • Noisy and power-hungry compared with 5400 rpm 2.5-inch drives
  • Not a good boot drive; SSDs are faster and similarly priced at 1 TB

Seagate Constellation.2 ST91000640NS Hard Drive prices at every store

  • eBayNew

    In stockSold by uu66854

    $44.29Observed at 2:25 AM
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  • CompSourceNew

    In stock

    $95.41Observed at 2:24 AM
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  • Beach AudioNew

    In stock

    $96.04Observed at 2:24 AM
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  • Newegg.comNew

    In stockSold by BeachAudio

    $97.41Observed at 2:24 AM
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  • Technology GalaxyNew

    In stock

    $98.60Observed at 2:24 AM
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  • Best BuyNew

    In stock

    $106.70Observed at 2:24 AM
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  • neweggbusiness.comNew

    In stock

    $140.00Observed at 2:24 AM
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  • HardDrivesDirectNew

    In stock

    $145.95Observed at 2:24 AM
    Visit store

Also available at

  • directmacro.comCheck price at directmacro.com

Seagate Constellation.2 ST91000640NS Hard Drive price history

Lowest price we've seen: $44.29 on Nov 5 at eBay. Tracked across 8 stores since Nov 5.

What reviewers say

Owners of Constellation.2 drives generally describe them as dependable server drives that run for years in NAS and lab machines. The common complaints are noise, heat and the occasional drive arriving with high power-on hours when bought as 'new' old stock.

Pros
  • Long service life in 24/7 server use
  • Consistent performance for a 2.5-inch HDD
  • Enterprise build quality
Cons
  • Audible seek noise
  • Runs warm in tight enclosures
  • Old-stock units can show wear

Specifications

Connection
SATA
Rotational Speed
7200 rpm
Form Factor
2.5 Inch Drive
Drive Type
HDD
Capacity
1 TB

Questions and answers

Is the Seagate Constellation.2 ST91000640NS worth buying in 2026?
Only if you need cheap 2.5-inch bulk storage for a NAS, server or mini PC. At $44.29 at eBay as of November 5, 2026 it is inexpensive per terabyte, but a 1 TB SSD costs little more and is far faster for a boot drive.
Will it fit in a laptop?
Usually not. It is a 15 mm-tall 2.5-inch drive, and most laptops take 7 mm or 9.5 mm drives. Check your bay depth before ordering.
Is this drive good for a NAS?
It works in a small NAS with 2.5-inch bays and is rated for 24/7 use. For a new build, though, larger 3.5-inch NAS drives offer more capacity and newer firmware for similar money per terabyte.
What is the difference between the ST91000640NS and an SSD?
The Seagate is a spinning 7200 rpm hard drive: about 100-130 MB/s sequential and milliseconds of seek latency. A SATA SSD is several times faster and silent, but costs more per terabyte at high capacities.
What comes in the box?
Typically just the bare drive, with no SATA cable, screws or bracket. Confirm with the seller, since OEM server drives are often shipped without accessories.
When is it cheapest?
Prices on this older model move with remaining new-old stock. The $44.29 eBay listing as of November 5, 2026 is already near the bottom of its recent range, so waiting is unlikely to save much.
Where is the Seagate Constellation.2 ST91000640NS Hard Drive cheapest?
At eBay, for $44.29, 55% under what the other stores charge, as of our latest check.
Where can I buy the Seagate Constellation.2 ST91000640NS Hard Drive?
9 stores we checked sell it, including eBay, CompSource, Beach Audio, Newegg.com, Technology Galaxy.

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