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Seagate Constellation.2 ST91000640NS 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 2.5" Enterprise-class Internal Hard Drive Bare Drive

Ships from United States.

Sold by E.O.L. Tech Inc,. a-seller and Shipped by Newegg

Purchases from these Sellers are generally covered under our Newegg Marketplace Guarantee.
Marketplace Seller
  • Maximizes data center footprint with up to 76TB per square foot
  • Highest nearline reliability with an MTBF of 1.4M hours
  • SATA 6Gb/s 7200RPM 64MB Cache 15mm

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The Constellation.2 drive, the most energy efficient enterprise drives on the market along with its high-capacity and enterprise reliability, provides a sustainable solution for your expanding data storage needs. Designed to meet and exceed expectations of your power envelope, the Constellation.2 drive allows you to come in under budget. Ideally suited for use in both server and networked storage solutions in space-constrained IT environments, the Constellation.2 drive allows you to design small and deliver BIG.


Learn more about the Seagate ST91000640NS

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years
  • Read full details
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Fine product, reputable dealer.

Pros: They worked, no complications with the function itself.

Cons: These HDDs were too thick (height-wise) to fit our NAS' HDD bays.

Other Thoughts: Seller was fast to respond on two separate issues; made the whole transaction much easier to conduct even with the encountered hassles that were in no way their fault.

Did you find this review helpful?
Ownership: 1 week to 1 month
Verified Owner
2/ 5
Too thick to fit (15mm)

Pros: - Seagate warranty
- 7200 rpm
- high capacity

Cons: - at 15mm, it's the thickest 2.5" drive I've ever seen. Besides not fitting into any of my bus-powered external USB drive enclosures, this also would not fit into the Upper Bay of the Mac mini, where I needed to put it. It's just too thick. And there is virtually no documentation out there pointing out that such think drives might not fit into these places. So even though this might be considered a valid drive thickness, most applications definitely do not EXPECT the drives to be this thick. So this is a major RED FLAG for this drive.

Other Thoughts: I was reluctant to buy the HGST alternative because I wanted a Seagate warranty, and I thought HGST. But when I took apart my Mac mini, I found that Apple's OEM spinner drive was actually HGST. And then given my lack of options, I was happy to go HGST as my alternative to this Seagate, and now it's up and running. (The HGST is also 7200rpm and 1TB and affordable).

1 out of 5 people found this review helpful. Did you?
Ownership: less than 1 day
Verified Owner
3/ 5
Check it's size before buying

Pros: Pros: Enterprise-class 2.5" drives are great workhorse drinks in a small form-factor. Plus with SED capability, makes it a good investment. It's a reasonable price for a EFD. Also it has a small SSD and 64mb of cache which helps accelerate IO, along with a base rotation speed of 7200rpm.

Cons: S I Z E !! If you are considering putting this in a laptop, stop now and look for alternatives or double-check your clearence. This drive, while 2.5", is much taller than a traditional 2.5" which can make it difficult to fit in tight spaces. FYI this will NOT fit in a macbook pro 17" using OCW's data-doubler. It fits in the Data Doubler just fine but you'll find that you can't secure the bottom because the drive-side is about 1/4" too tall. Unless your laptop is huge or is use-case specific such as a gaming laptop, it likely wont fit.

Other Thoughts: I bought this not doing more homework than I should have. I dont fault Newegg for this. The order/deliver process typical Newegg - great. Don't be me - check out the specs and make sure this drive will fit in your laptop.

0 out of 3 people found this review helpful. Did you?
Ownership: 1 day to 1 week
Verified Owner
2/ 5
Unusable for my system

Pros: In theory would have been a fast drive.

Cons: Be warned that you need a 12V line in order for this drive to work and most laptops do not provide this (5V only)

I got caught by this and had to return the drive.

2 out of 4 people found this review helpful. Did you?
Ownership: 1 day to 1 week
Verified Owner
2/ 5
Are Enterprise drives better?

Pros: Large capacity,7200 rpm works with Linux and FreeBSD

Cons: Of six purchased for a RAID array, one failed initial SMART test on first power up

Other Thoughts: It is very unusual for a drive to fail the SMART test on initial power up. In fact, I don't think it has ever happened to me out of several hundred purchased over the years. It makes me wonder if "Enterprise" drives are actually better than "consumer" drives.

0 out of 1 people found this review helpful. Did you?
Ownership: 1 month to 1 year
Verified Owner
5/ 5
Excellent product & price

Pros: Extremely reliable and efficient drive that is priced at a point that small businesses can benefit from.
I purchased a pair of these to use as a on-site backup storage for my web server. Because my ISP charges per U, I bought a 1u server which used 2.5" drives; this works perfectly as I can instantly restore my customers' backups instead of having to go on-site and restore from off-site copies.
These drives have been going strong for 3 years, now! I just moved them into a new array and have seen up to 135MB/sec write rate in a Raid1 config.

Cons: Some may have issues with using this drive in laptops due to over-size height. Please note that this is an enterprise drive NOT designed for laptop applications.

1 out of 1 people found this review helpful. Did you?
Ownership: 1 day to 1 week
Verified Owner
3/ 5
Note Height!

Pros: Seems like a high quality drive, very high MTBF.

Cons: Not for laptops! Twice as tall as a normal internal laptop hard drive.

2 out of 11 people found this review helpful. Did you?
Ownership: more than 1 year
5/ 5
Solid dependable drives

Pros: Spin up fast, fast access times, excellent density for the size. I have been using these (8 so far) in ESXi servers for over 3 years, I have never had a failure. 4 of these have replaced "laptop" hard drives during that timeframe. Very happy with these. They are proving well worth the money (you get what you pay for is true here, higher quality components), these are after all Enterprise-class HDDs.

Cons: None so far.

Other Thoughts: These will NOT fit in a laptop, they are 15mm high, which is thicker than a standard 12.5mm laptop HDD slot. They however fit perfectly in any server-class 2.5" HDD hot-swap chassis' out there.

6 out of 6 people found this review helpful. Did you?
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