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Western Digital WD Green WD6400AARS 640GB 64MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive


  • 64MB Cache
  • SATA 3.0Gb/s
  • 2 years limited
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Learn more about the Western Digital WD6400AARS


Western Digital
WD Green
Bare Drive


SATA 3.0Gb/s

Physical Spec

Form Factor


WD Caviar Green drives make it possible for energy-conscious customers to build systems with higher capacities and the right balance of system performance, ensured reliability, and energy conservation.

Reduced power consumption

Cool and quiet



Low power spin-up

Advanced power technology

Manufacturer Warranty

2 years limited
2 years limited

Quick Info


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years

Customer Reviews of the Western Digital WD6400AARS

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  • Jeheretic
  • 12/3/2012 3:57:52 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

1 out of 5 eggsWD Quality is lacking

Pros: Had to replace in less than a year, then was sent a 750 black has to replace it in less than a year, what is going on over there wd? you were the best, geeze!

Cons: too many times replacing items,,,

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  • kajunman47
  • 11/14/2012 1:12:07 PM
  • Tech Level: Average
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsAdded Storage

Pros: Since I am using a 90 GB SSD for my Boot Drive, I load all my programs on this drive, about 190 GB. Never had any issues with it.

Cons: None

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  • DavARei
  • 2/15/2011 2:31:40 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsSad day in mudville

Pros: price

Cons: soo many bad sectors, the disk check utility from their website couldn't even check it.
I had a Seagate disk that could ... and 2 hours into the test, there were so many that I stopped it and called support.
NewEgg replaced quickly.

Did you find this review helpful? Yes No

  • IC53
  • 2/5/2011 7:15:26 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsWorkks great

Pros: Does exactly what its supposed to. Came well packed. Runs as fats as a 4 yeard WD black :) - to my surprise . Also it is very quiet.

Cons: None

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  • karambanix
  • 2/4/2011 1:32:21 AM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsWestern digital Caviar 640GB-SATA

Pros: works great,very quite

Cons: None yet

Other Thoughts: will buy bigger size later,I pleased so far.

Did you find this review helpful? Yes No

  • 2/2/2011 10:46:50 AM
  • Tech Level: High
  • Ownership: more than 1 year

5 out of 5 eggsDrives Have Been Working Quite Well!

Pros: As a long-time system builder, I have had nothing but success with this particular WD series. After over a year, these drives continue to perform very well in every system that they've been installed. After all, isn't that what we're all seeking?

Cons: None.

Other Thoughts: For those not quite satisfied with these drives, there are many factors that can impact performance and/or reliability. Far too numerous to delve into here. Like people buying the same new car, sometimes some of us are just among the unlucky few to acquire a less-than-perfect product. That's simply how it goes in the world friends...

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  • trav90
  • 1/29/2011 10:14:26 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat drive!

Pros: Love Western Digital drives! Works great from day one!

Cons: none

Other Thoughts: Great perfomance, great price!

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  • N/A
  • 1/27/2011 9:58:34 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs

Pros: -Large Cache
-Extremely quiet, I cannot hear it unless I put my head near it even with fans all the way down.
-Low power usage
-Good storage/price

Cons: -Not the fastest drive but fast for what it is

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  • Carne
  • 12/17/2010 5:43:17 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsSo far, so good.

Pros: This new drive arrived in good condition, and upon being hooked up to the bench tester powered up without hesitation and formatted efficiently.
Ran it through the monkey jungle of testing:
Transferred a hundred gigs onto and off.
Fast random file access.
All of them done quickly and without annoyance.

Once spun up, the drive is fairly fast for the type and operates without building much heat either. Very quietly as well.

Cons: Did not include a jumper.

Other Thoughts: If you are using Windows XP, you need to emplace a jumper on pins 7-8, prior to installing the drive in your system.
If you are using Vista or 7, no jumpering needed.

I'm only giving this a 4 egg due to the fact that the initial drive was DOA.

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

  • tytotheler92
  • 12/7/2010 5:45:43 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat Drive, just know the limitations

Pros: This is another great drive from WD. Reliable, cool running, and, well, Green. Also extremely fast in windows Vista/7 and Server 2008 OSes for a 5900RPM drive. The huge cache makes up for that slow RPM.

Cons: This is an Advanced Format Drive, which moves the sectors from every 512kb to every 4 megabytes. What does this mean to you? Better error correction ability and faster performance/less fragmentation. BUT, it also means that OSes produced before Vista cannot take advantage of this, and will in turn corrupt themselves while using the drive if the drive is not either periodically aligned or jumpered to the XP setting. This causes serious issues and in turn is why the reviews aren't all that good overall.

Other Thoughts: This is the drive for Vista/7 low power devices/large storage.

Otherwise, don't buy it. It will cause more headaches then its worth. I had to run out and get a 500Gb WD Blue for the client when I found out this wasn't going to work in Home Server (SBS 2003 based) and it just added another complication I didn't need.

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

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