Recovering a dead external hard drive

externalhd_20071125.jpg

What do you do when good hard drives go bad? Tell me if this sounds familiar. You spend a year or two filling up an enormous external hard drive, and just as you start thinking it might be a good idea to buy another enormous drive to back up your data, you boot your computer and hear a heart-stopping sound from your disk: thuck... thuck... thuck... thuck... @#$%!!!!

I had a huge amount of data go dark on me two weeks ago. I suppose I reached the end of the grieving process this weekend, because my mind started to clear up and it occurred to me that maybe all was not lost. After all, there are a lot of electronics in those external hard drives, separate from the drive itself. Inside your typical external hard drive is just a normal 3.5 inch internal hard drive plus the electronics necessary to power everything, control the drive, and provide USB or Firewire connectivity to the host computer.

So, voiding the warrantee, I pulled the enclosure apart and replaced the suspect drive with a working EIDE drive I had lying about. Sure enough, when I turned things on, the drive I knew to be good started clacking away. At this point, I was pretty sure my data was still safe and sound, but being that I didn't have a machine handy that could mount an XFS formatted disk, I couldn't verify things for sure until I could get the disk connected back to my iMac.

Most computer stores sell really cheap (approx. $30) hard disk enclosures which you can just slap an EIDE disk into to create an external Firewire or USB drive. I ran to my local store, picked one up, and I'm happy to say that I just recovered 320GB of data that I had just about given up on.

If you own an external drive that's failed on you, make sure to test the drive and enclosure before you throw it out. It's quite possible that your data is still intact and you can save yourself a couple hundred bucks and a lot of trauma by just replacing the enclosure.

At the very least, you might have a bad disk but a working enclosure that you can use to make a new external disk.

On a side note, until today I only owned a single external drive. Being that there's only one data point, I can't say a whole lot for sure, but I keep thinking that I'm just a random person with a 100% enclosure failure rate. Until I hear otherwise, I remain suspicious that this might be a fairly common failure point.

Posted by Jason Striegel | Nov 25, 2007 10:24 PM
Hardware, Life, Lifehacker | Permalink | Comments (8) Bookmark and Share

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Posted by: ggrk on November 26, 2007 at 1:36 AM

Good one Jason. One of my IDE hard disk packed up after not being in use for many months. An electrolytic capacitor has shorted and burnt a track. Repaired the track and used a salvage cap from another junk.. the disk is working ever since.


Posted by: DeadlyDad on November 26, 2007 at 2:19 PM

I had an 80GB hd go so far bad that all it would do is click and grind. Three weeks of running a SpinRite level 5 diagnostic on it 24/7, with a fan blowing constantly to keep it from overheating, and I recovered 96% of the data on it. That was over a year ago, and it is still one of my main drives. I now make it a point to run it on every drive that comes in the house, and have saved myself from quite a few 'gotchas'. At $80 it might not be cheap, but neither is a first aid kit or fire extinguisher, and, like those, the consequences of not having it when you really need it don't bear thinking about.


Posted by: RDAC on November 27, 2007 at 8:17 AM

The first generation of Maxtor OneTouch, and I think the OneTouch II's for the most part, were famous for dying. Sometimes the LED circuit would give way, sometimes it was worse.

The first signs were usually Windows not wanting to detect it, then it developing a 'preference' for one port over the other (either the firewire or the USB would start failing), then the board in the enclosure would short, frying the drive's controller board.

Either way it was an easy fix, pick up a new controller board for the drive off of ebay and replace the enclosure. It was a shame, too...most of those enclosures were easy to work on and high quality, just crappy circuits.

I normally tell folks to go check if their controller board or drive is still on ebay first when they've got a 'dead drive'. 90% of the time, this will fix it.


Posted by: on November 30, 2007 at 12:03 PM

How to mitigate having to recover data from an external drive

Have 2 drives in a software RAID1 (mirror). Monitor it so you know when one of the drives fails so you replace/fix it. This will increase the reliability 50%.

10 years ago software RAID was too slow and hardware RAID was too expensive. You can buy dual RAID external drives reasonably nowadays. If you have a faster CPU (2GHz) or multicore CPU, you can do software RAID w/o slowdown.

How long did it take to fill that drive? If it's just downloads, 320 GB will take over 180 hours over a 5 Mb/s internet connection. If it's a single 320 GB file and the pipe averages 5 Mb/s. That's a lot of time to waste.


Posted by: on December 6, 2007 at 9:13 AM

I've seen a number of these external drives "silently" die (ie. no clicks of death, just a quiet unwillingness to work). Most of the time it's been a faulty board, so you can pop the case and plug the drive into a regular PC (or use any number of external USB adapters).

For anything I can't replace (photos), the data are on (at least) 2 external drives. I only use single disks for stuff I can recreate if necessary--ex. DVDs. Years in IT Engineering has taught me that even the most redundant arrays can die a horrible death.


Posted by: on December 11, 2007 at 7:14 PM

I had the exact same problem, and fixed it the exact same way. Replaced the board and now it works and got all my data back. Still have to troubleshoot the old board. Time vs. cost at this point.


Posted by: Gata74 on January 27, 2008 at 4:08 AM

Recently my Western Digital 1TB hard drive died, is there anyway i can recover my data from it?


Posted by: Joe Poniatowski on February 10, 2008 at 11:19 AM

Had the same trouble with a SimTech 160 Gig drive. I took it out of the enclosure (warranty expired) and installed it directly into my linux box, configured the mount points, and it worked like a charm. I gave up the convenience of moving an external drive from box to box, but gained quite a bit in performance - ultra IDE vs. USB.


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