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Western Digital WD Green WD6400AACS 640GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive Bare Drive

  • 7200 RPM 16MB Cache
  • SATA 3.0Gb/s
  • 2 years limited

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The Western Digital Caviar Green 640GB Hard Drive uses less power and support quieter, cooler-running desktop PCs. Its breakthrough 16 MB cache makes this hard drive suitable for high-performance home and business computing, as it can handle high-end data-intensive and multimedia applications.

This hard drive incorporates WD’s GreenPower technology, which yields lower operating temperatures and low acoustics, best for ultra-quiet PCs and external drives use. The IntelliPower delivers a fine-tuned balance of spin speed, transfer rate and caching algorithms; IntelliSeek Calculates optimum seek speeds; and IntelliPark automatically unload the heads during idle. All the features help the drive to operation in lower power consumption and reduced noise environment.

  • newegg GreenPower Technology With GreenPower technology, the Western Digital Caviar Green WD6400AACS yields lower operating temperatures for increased reliability and low acoustics for ultra-quiet PCs and external drives.
  • newegg Reduced Power Consumption Combined with WD's IntelliSeek, IntelliPark, and IntelliPower technologies, the Western Digital Caviar Green WD6400AACS has reduced power consumption by up to 40 percent compared to standard desktop drives
  • newegg SATA 3.0 Gb/s Interface The Western Digital Caviar Green WD6400AACS features the SATA II interface supporting up to 3.0 Gb/s data transfer rates, Native Command Queuing (NCQ) and hot-pluggable point-to-point connections for optimum performance, efficiency, convenience and flexibility.
  • newegg Perpendicular Magnetic Recording Perpendicular Magnetic recording technology enables industry-leading capacity in existing standard form factors and improves performance by increasing data density while reducing moving parts for enhanced reliability.

Learn more about the Western Digital WD6400AACS

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details

Customer Reviews of the Western Digital WD6400AACS

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  • Michael E.
  • 5/5/2014 6:50:14 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggs

Pros: Outstanding reliability. I really don't do reviews much, but I felt the need for this product. I was highly skeptical of the "green" line from WD, but I'm convinced. I bought this back in 2009 and I've never had any issues. I use this as a storage drive for media and backup files and I've never reformatted. 5 years to the date!

Cons: It can be slow to start back up from sitting idle, but that's what you get when you get the green.

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5 out of 5 eggsWD GREEN = WIN!!

Pros: Everything!! Quick, quiet, energy efficient!! Love it!

Cons: None... absolutely none!! It's been Brilliant!!

Other Thoughts: This little drive has been toiling away in my home file server since 2009 with no problems at all. My WD Green army has been flawless!! 2x 500GB, 2x 640GB, 2x 750GB drives have all been running 24/7 since mid 2009 when I built this thing and can't express how happy i am with them. Never had a single WD Green Die on me yet.

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  • Mohammed A.
  • 11/23/2012 11:58:11 AM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

3 out of 5 eggsLasted 4 years

Pros: Quiet. Relatively affordable at the time of purchase.

Cons: Thought it would last longer like the WD Black series. The greeen start showing problems as a main drive about 1.5 years after purchase. Then used as a storage/back up drive and died soon after.

Other Thoughts: Don't plan on buying another WD Green drive again. Though WD Black drives are my favorite because of reliability and performance.

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  • Max J.
  • 8/30/2011 8:29:31 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsGood Enough

Pros: It has been a basic storage drive for well over a year.
I've had no problems with it at all.
It runs nice and cool and stays pretty quiet.
Good value.

Cons: Seems a little sluggish sometimes, compared to my other 7200 RPM HDDs. Since it's used for media storage (music and movies) it's not a big deal.

Other Thoughts: I've never tried installing programs on it, but for storage, it's great.

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  • Howard H.
  • 8/11/2011 1:35:40 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

3 out of 5 eggsDead

Pros: Good for storage

Cons: Dead in about a year

Other Thoughts: This drive died after about a year but didn't need to replace it right away. About a year later found this drive in the basement and verified that I can still send it in for replacement. WD sent me back a 750GB 32MB Cache so happy I waited :)

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  • Christine M.
  • 2/3/2010 9:20:08 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsWhen a product is good you notice the little things...

Pros: Easy to set up through the Western Digital site. The Western Digital program for cloning my old hard drive to the new one worked well. Even going from EIDE to Sata wasn't a problem.

Everything seems to work fine, and performance has improved quite a bit. Shipping was quick as usual from Newegg.

Cons: It's somewhat more loud than I expected. It's not that it's loud in it's own right, it might be whisper soft compared to the high pitched hum of my other components and fans, but when it's actively seeking it's sound is a low pitched rumble more like a kid blowing bubbles in his milk through a straw. It's just so noticable, while the hum is just background.

Other Thoughts: Pentium 4 system from back when the Blue Man Group commercials were still going on.

My fault, but didn't know my old hard drive was EIDE (yes, did check that my Mobo had SATA hookups), so ended up shelling out a (relative) fortune for a new cable at Best Buy, when I expected to just plug it in with the old cable.

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  • Andreas E.
  • 1/22/2010 10:11:50 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year

5 out of 5 eggsNice drive but with limitations

Pros: I have had this drive installed for nearly a year, had several OS installed, Linux, OSx86 and XP. The drive is very quiet, but you may hear the head park often though it's very subdued. Temperatures are low which in a small form factor PC with limited cooling, is an added bonus.

Cons: Not the fastest but works for the average user, probably better as a storage disk then for OS if you want max. performance. Head park/load cycle count seems to be an issue with Linux based OS which may cause the drive to reach the 300K load/unload cycles in less then a year. I noticed using HDtune that this was evident when using Linux. WD released a patch to fix this but some have said it does little to help.

Other Thoughts: WD makes good drives in my opinion, if your using Linux or have these in a NAS that runs Linux you may want to check the drive health more often then what's usual.

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  • Kristopher G.
  • 1/19/2010 1:06:39 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsyep

Pros: WD..always has been reliable for me. Would have preferred the 32 MB cache but this one was on uber sale for 10 bucks less than usual. Been happy ever since.

Cons: Doesn't bring breakfast in bed.

Other Thoughts: Tucans are cool birds.

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  • DAVID B.
  • 1/18/2010 6:58:57 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsThe tree huggers drive

Pros: - seems to work the same as my Caviar Black but on less power I guess.
- less power means less energy. less energy means more trees. more trees mean more oxygen. more oxygen means I'll live longer and play on the PC longer - YAY!

Cons: - it works so no con

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  • Joshua S.
  • 1/8/2010 1:51:25 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsIt works

Pros: It's a 640gig hd, western digitals have been good to me. Price wise at the time of my budget it was perfect.

Cons: I think they should really start labeling these drives with both base 2 and base 10 so people would quit complaining about it not being the right size.

Other Thoughts: For all you "techs" out there, know your SATA terminology. SATA I (SATA150) and SATA II 3.0Gb/s. If you have an older system with SATA, or a PCI controller card, you more than likely have an SATA I based controller. Adding this drive as is into it, it may be recognized by the BIOS, but you will receive errors in windows such as "delayed write errors" out the wazoo and tests will more than likely fail for it. In order to use this SATA II drive with said controllers, a jumper must be placed on the 5th and 6th pin in order to put the PHY limiter in place. It is labeled on the drive.

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