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Item#: N82E16822148710

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

  • 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

Seagate Constellation.2 drives are the most energy efficient enterprise drives on the market. Designed for enterprise robustness, Constellation.2 is available in capacities up to 1TB and offers reliable storage for high capacity servers and storage arrays in a minimal footprint.


Learn more about the Seagate ST91000640NS

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years
  • Read full details

Customer Reviews of the Seagate ST91000640NS

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  • thomas w.
  • 6/7/2014 5:07:35 PM
  • Tech Level: High
  • Ownership: less than 1 day
  • Verified Owner

3 out of 5 eggsCheck 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.

Did you find this review helpful? Yes No

  • Eric K.
  • 5/19/2014 8:52:27 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsUnusable 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.

1 out of 1 people found this review helpful. Did you? Yes No

  • Daniel F.
  • 1/4/2014 1:09:45 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsAre 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.

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  • Garrett C.
  • 9/4/2013 11:00:55 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsExcellent 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.

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  • Brett H.
  • 1/19/2013 3:58:43 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsNote 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 8 people found this review helpful. Did you? Yes No

  • Michael M.
  • 1/7/2013 3:06:25 PM
  • Tech Level: High
  • Ownership: more than 1 year

5 out of 5 eggsSolid 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.

4 out of 4 people found this review helpful. Did you? Yes No

  • Grant B.
  • 8/25/2012 3:16:38 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsToo thick, not compatible for Lenovo Thinkpad Ultrabay

Pros: I'm sure this is a great drive, the specs are awesome.

Cons: This drive won't spin up in my lenovo ultrabay and it's so think it doesn't fit without applying an uncomfortable amount of force.

0 out of 6 people found this review helpful. Did you? Yes No

  • Michael F.
  • 7/31/2012 8:58:36 AM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat in an array

Pros: In comparison to a similar 3.5" drive:
Very quiet
Low power
Rapid acceleration from rest
Excellent volumetric density

Cons: May be tall for some users

Other Thoughts: I've been using these drives in a SNT-SAS425, which converts a standard 5.25" bay into four hot-swappable 2.5" bays (Awesome!), for just under a year now. I had a large RAID 5 array of 1TB disks that I'd had for a while and didn't want to go through the expense of changing all the disks to larger ones but needed more storage space and was out of room for 3.5" drives. My case has 6 5.25" bays, though, so using the nifty adapter mentioned above, I was able to add many more slots for extra disks. This drive meant that I could continue adding 1TB disks to my array without replacing all of my existing drives.

I've been very happy with the performance of the drive so far, and my only complaint would be that after the flood in Thailand or whatever last fall, the price on these drives still hasn't come back down to what it was prior to that - bummer.

If you're looking to put together a RAID array in a compact space, the combo of the SNT-SAS425 (and similar) with these drives is hard to b

2 out of 2 people found this review helpful. Did you? Yes No

  • Garrett C.
  • 12/14/2011 8:09:25 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsExcellent Drive For Web Server

Pros: Fits in almost ALL newer servers, especially my HP DL360. I purchased two of these drives to run in Raid1 from my HP P400i Hardware Raid to provide large file storage to three separate VMs. They work precisely as intended and use less power than stated.

Cons: None

Other Thoughts: To the folks that are expecting this drive to fit in their laptop: Just read the manual. This is an enterprise drive for use in Servers and Desktop Environments that require large storage in a small(er) form-factor and lower current consumption.

4 out of 4 people found this review helpful. Did you? Yes No

  • Derick M.
  • 9/26/2011 9:55:45 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsStill not sure!

Pros: Bought this 'third' drive to add to a RAID pair as a spare.

I now have three of these 2.5inch drives installed in an HP ML370 server platform, used as a home PC. Twice when I didn't have the spare, I encountered data loss while making configuration changes on another SAS adapter, not the HP P400 adapter these are attached to.

Since I added the spare, I haven't experienced any problems, and I have been making other system changes.

It seems like a solid performer, and certainly has the weight of an enterprise class drive. Heat doesn't seem to be much of a problem either.

Cons: None that I am aware of.

Other Thoughts: These three drives, RAID pair and spare, are my system OS drives. I require them to run flawlessly.

3 out of 3 people found this review helpful. Did you? Yes No

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Item#: N82E16822148710
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