I bought a WD MyBook 500GB to back up my two internal drives that I have had for over 4 years each. The backup went smoothly over Firewire at a respectable speed and everything was fine for months and months.

Fast forward to a month ago. I was using the external drive when all of a sudden there was a click and it powered off. I tried turning it back on but it would click on spinup and power off again and again. Obviously this is making me panic as I know that the internal drives that I backed up are going to die any day. I also know that the probability of being able to back up those drives onto another one is lower than ever.

So here I am at the mercy of WD. I know that I absolutely need to be able to access the data on the MyBook. I decided to take it apart and remove the SATA drive within. When I opened it I realized that the hard drive itself was so hot that the metal burned me on contact. Obviously the hard drives should not be so hot that you can boil an egg on them. I thought maybe since my computer has fans blowing at the hard drive bays, I can put the drive inside my computer. For those not familiar with the MyBook external drive, the enclosure has no cooling what so ever.

I was able to put the drive inside my computer and everything was running great, until a couple days ago. I downloaded 20 gigs of data that I needed to transfer to this 500GB drive that I got out of the MyBook. I started the transfer and then saw the approximate copy time was 4 hours. The transfer rate was 1.5MB/s (Megabytes, not Megabits). Obviously this is ridiculously slow over the SATA interface even on the low RPM WD Green drive.

My next move was to try to figure out if maybe there is some issue with Windows 7, or with drivers, or maybe anything else that is creating a bottleneck on the transfer. I did a reboot into Ubuntu with a LiveCD, mounted the necessary drives, and started the transfer. Exact same situation, 1.5MB/s and not a kilobyte faster.

I rebooted back into windows and ran a test on both my main OS drive and the WD drive having this issue. The results are as follows:

OS Drive (Best of 5 Tests, 100MB Test Data Size)

Sequential Read: 49.01 MB/s
Sequential Write: 48.28 MB/s
Random Read 512K Chunks: 19.51 MB/s
Random Write 512K Chunks: 23.97 MB/s
Random Read 4K Chunks: 0.298 MB/s
Random Write 4K Chunks: 1.132 MB/s

Faulty WD Drive (Best of 5 Tests, 100MB Test Data Size)

Sequential Read: 41.82 MB/s
Sequential Write: 1.060 MB/s
Random Read 512K Chunks: 25.83 MB/s
Random Write 512K Chunks: 1.250 MB/s
Random Read 4K Chunks: 0.395 MB/s
Random Write 4K Chunks: 1.575 MB/s

Obviously something is horribly wrong. The read speed is completely fine, probably what it always was. The write speed on the other hand is abysmal. What could possibly cause the write speed to slow down so much and not affect the read speed? It is worthy of noting that once the data is written at this very low speed it is written correctly. There is no file corruption. If I run a S.M.A.R.T. Quick Test (Using Western Digital Data LifeGuard Diagnostics software), I get this error message:

Quick Test on drive 1 did not complete!
Status code = 07 (Failed read test element), Failure Checkpoint = 97 (Unknown Test)
SMART self-test did not complete on drive 1!

But on the actual main screen of the utility it says that the drive SMART Status is PASS.

That was a lot of information but hopefully someone knowledgeable with Hard Drives can help me with a couple questions.

1. What is going on? Did the heat in the external enclosure damage the drive?
2. Why can I still use the drive without any problems other than a slow write speed?
3. What is going on with this SMART Status and what does that Quick Test result mean?
4. Should I expect this drive to die on me any second?

Pretty much any other input anyone has would be great. I really want to diagnose what happened and unfortunately I don't have that much experience with Hard Drive issues.

  • Wouldn't the correct course of action have been simply to claim a warranty replacement? Nov 18, 2009 at 18:06
  • 1
    I have no way to do the replacement right now. I don't want to use my credit card for them to hold and I can't ship the thing out first because I need to back up what's on it. And I don't have the space to back it up.
    – Marcin
    Nov 19, 2009 at 5:12

7 Answers 7


What is going on? Did the heat in the external enclosure damage the drive?

It is impossible to say for sure, as we can't for sure say if the heat is a symptom or a cause. I would tend however to support your thesis, though, as heat affects magnetic properties of materials.

Although it is unlikely that your HD reached any close to the curie temperature, heat can still weaken the magnetic proprieties of materials, as cold improves them. It might be (but this is just an hypothesis) that the magnetic proprieties of the disk surface or of the writing heads have weakened.

Also, heat can have deformed the physical shape of some component, making them less effective (for example a writing head which is now further away from the disk surface).

A test you could do is to wrap your HD in a watertight plastic bag and immerse it in a bowl of crumbled ice (even better: you can mix the crumbled ice with salt, that brings the temperature down to circa -21°C) and repeat the tests there. You might notice an increase of performance.

Incidentally his is a technique that - through contraction of the materials - is also useful to unstuck movable parts (which does not seem your problem, as normally a stuck movable part means no read and no write capabilities at all).

Another common cause of disk failure is vibration. Vibration brings lack of precision in the moving parts, tear of joints, wrong alignments between heads and disk surface, and so on and so forth. In case something is now impeding the disk to revolve smoothly, you would for sure have extra heat generated by both the friction and the increased power used by the engine to keep up the rotation at the same speed. In this scenario heat would be a symptom rather than the cause of your problems.

Why can I still use the drive without any problems other than a slow write speed?

With a metaphor: for the same reasons for which you will go faster on a well lubricated bicycle than on a rusty one. Modern hard drives are smart enough to compensate for hardware problems, so - unless a core component is broken - they will find a way to keep running (this is so because HD's obsolete very quickly, and if they would stop working at the first writing error or corrupted sector, you would be changing your HD every few weeks).

What is going on with this SMART Status and what does that Quick Test result mean?

Unless you find some official documentation, this is a question one might only infer the answer to. You can pick your favorite one: from marketing reasons (so you do not immediately notice defects!) to human mistakes (it's just a bug, it should report "not passed") transiting by design ones ("pass" means the HD is still usable, the test that fails signal the fact a non-essential subsistem is broken)

Should I expect this drive to die on me any second?

Again: you can never know for sure. I have still a 5 Gb unit from the 90's up and running, for example. But consider this: you normally would keep backups of a totally healthy HD because it might - all of a sudden - fail. Now, you have an HD with visible signs of bad health status, heating up like crazy, having degraded performance and failing tests... if I were you, I would definitively hope for the best but prepare for the worst!

Hope this helps, and if you try the cryo trick (the ice thing) I would be very interested to know the outcome of it. Best luck!

  • 1
    Thanks, this was the most comprehensive answer and although you didn't get as many up-votes as the other answers I believe yours was the best one. I ended up buying another HD to transfer everything to and I'm going to RMA this one. While it didn't take that long to transfer everything off of it (since it still reads at a normal rate). It did take over a week to do a zero and then a random wipe though. I find it amazing that at 1MB/sec it managed to last for over a week of non-stop writing activity. Unfortunately my OS drive (old 160GB) is starting to get write errors. Bad HD luck lately.
    – Marcin
    Nov 26, 2009 at 20:41

Once a drive starts showing odd behavior your best bet is to find a replacement and backup/move the data that was on there. Right now it sounds like you can read the data off the drive, which is definitely a good thing.

You could try and get it replaced if it was still under warranty and if the warranty didn't get voided when you pulled the drive out. But you may want to switch product/vendor as this seems to have failed pretty early in the game.

I'd bet your guess about overheating is quite likely correct… doesn't change the fact that it sucks losing a drive like that.

  • The drive started failing very quickly. What I don't understand is how they stick it in the enclosure without any cooling and expect it to last at those temp levels. It is still under warranty so I can definitely get it replaced. The problem is that I don't have another drive at the moment to migrate the data to. If I want WD to send me the new drive first I have to give them my CC# which I am hesitant to do. I'm hoping that someone can shed some more light on the issue and I can keep it until I get a new PC and migrate the data. Then I can just send the drive back and wait for a replacement.
    – Marcin
    Nov 16, 2009 at 4:37
  • Just give them your CC#. They are not scammers. I've done it (more times than I care to recall). Nov 21, 2009 at 22:30
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    They don't expect them to last. Instead, they expect you (the customer) to buy a new one when it breaks because you'll be able to get more capacity for less cost when that happens. So why bother putting any kind of engineering effort into keeping the drive cool? Often, manufacturers will put sub-standard drives into those enclosures and warrant them for about a year. But when purchased separately, the same drive mechanism will be warranted for three or five years. They know these cheap external drives will fail and customers will throw them away. Nov 22, 2009 at 8:11
  • @Barry Brown, sadly you're correct
    – Josh
    Nov 24, 2009 at 7:10

I would bite the bullet and get another hard drive. That 500GB drive sounds like it may fail at any moment and you shouldn't waste time trying to eek out another few months of service. If the data on that drive is that important to you, surely it's worth $50 for another drive.

If you value your data, backups are important. Don't skimp on them. Get yourself a good hard drive enclosure. I have one made of solid aluminum with USB, FW400, FW800, and eSATA ports -- it cost me about $90. I put into it hard drives with five-year warranties. I replace them every 18-24 months. I also subscribe to an online backup service for about $5/mo. My data is backed up in at least two places, both onsite and offsite.

As I said in one of my comments, the manufacturers of cheap external hard drives don't expect them to last very long. And they really don't expect consumers to claim warranty repairs, either. They'll just replace your broken drive with a refurbished one, anyway.

I know it's hard to differentiate one product from another. The temptation is to go for whatever is cheapest, figuring that the quality must be all about the same. And you're right: for the cheap stuff the quality is all pretty equally poor. Unfortunately, cheap crap is sometimes the only thing available -- the good, quality stuff having been long ago put out of business.

  • I had horrible luck with my WD WorldDrive. Replaced it under warranty once and then it failed again. Ended up getting a Buffalo LinkStation and haven't had no issues with it in over a year.
    – Zooks64
    Nov 26, 2009 at 15:14

1. What is going on? Did the heat in the external enclosure damage the drive?

Your drive is failing, and it's probably irreparable at this point--it overheated. If you're burned by a component, suffice it to say that the heat didn't only damage you.

The heating/cooling of those components probably warped something.

2. Why can I still use the drive without any problems other than a slow write speed?

Apparently, only the write circuitry is damaged. View this as "I can get my data off of the drive! Yay!" and then immediately do so.

3. What is going on with this SMART Status and what does that Quick Test result mean?

HDD vendors like to tell you your drive is OK even when it's actually failing (it's an image thing; e.g., if all Seagate drives screamed bloody murder at something minor like reallocating a sector, everyone would buy another brand because they'd "seem to fail" earlier).

If the SMART test can't complete due to an error, that's a problem. You can't accurately judge if the drive is bad because...the drive is bad.

4. Should I expect this drive to die on me any second?



Excuse me for this very elementary question:

In the Properties of the drive, Hardware Tab and again Properties of the hard disk, is "Enable write caching" checked?


  • Yes it is :). I have tried the hard drive on various operating systems too, it's the same everywhere.
    – Marcin
    Nov 22, 2009 at 2:19
  • 2
    Then the answer by mmDonuts is correct : the drive is on its way to the cemetery. The next one had better not be WD MyBook, because they get horrible reviews everywhere regarding write speed.
    – harrymc
    Nov 22, 2009 at 10:55

I also use WD 500GB MYBOOK!!

The problem is most likely to have caused by overheating of HArd disk!

Use HDD scan to analyze any errors in Hard disk! Also you can measure you HDD temperature! In most cases, WD mybook would have problems with temperature!


And another issue: You say u have slow transfer rate!! use the chkdsk /f command to correct some sector problems!

For backing up crucial data: I suggest you upload to an online server/FTP/file-hosting service/skydrive etc... ( IF you have unlimited bandwidth package )


Write datas to DVDS/ CDS and keep then in a SAFE PLACE!

Good luck!


You could try mounting it on the casing and check for any speed improvements ( keep the HDD casing holes near a fan )

  • 4
    You are little too excited about this question.. Nov 22, 2009 at 1:12
  • How do u know that?
    – user18836
    Nov 22, 2009 at 7:33
  • 1
    @ihecker All of the exclamation marks! :) Nov 22, 2009 at 7:45
  • I've been cooling it from two directions for the last week. You can see the pic here: i49.tinypic.com/5f2m9l.jpg The write rate stays at 1MB/Sec
    – Marcin
    Nov 22, 2009 at 21:11
  • so most likely, there is a damage to hard disk due to that overheating so I suggest you backup the data in a safe place ( maybe in ur friends PC, it may take a lot of time with 1MB/sec It is still under warranty so you can definitely get it replaced )
    – user18836
    Nov 23, 2009 at 3:11

Try connecting to a different USB port. If that doesn't work, back up everything to another drive, since read speeds are ok, then start playing with the drives. When connected with SATA, try a different port, cable and/or computer.

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