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Typical Failures And Data Losses

Study: A Look At Hard Drive Reliability In Russia
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Seagate Bitten by the "CC Fly"

Seagate's results stem mainly from the 500 GB to 1.5 TB Barracuda 7200.11-series. These products comprise over 65% of all failed Seagate drives received by Storelab. Most drives failed within the first one and a half years, and thus were still covered by the warranty. In comparison, the older Seagate 7200.10-series is much sturdier and only accounted for 35% of failed Seagate drives. The most common failure cause for the 7200.11 was faulty firmware, which would issue the error code "000000CC." This led the Storelab engineers to coin the term "CC fly" (tsetse fly). Faulty drives would slow down and subsequently die after rebooting.

There were other errors as well, and not just from Seagate. The most common was wedging of the drive's axle. This happens occasionally to all hard drive brands. High-capacity hard drives use three or more magnetic disks, or platters. The additional platters increase the load on the axle, and the resultant physical stress leads to motor failures. A drop of only 20 cm can be enough to wedge the axle, which will first manifest through increasing hard drive noise and vibration. Seagate uses a new technology in the 7200.12 and later drives to counter this issue. We will have to wait for more long-term studies in order to find out if matters have been truly remedied.

Western Digital in the Background

As for Western Digital's failures, 59% of the company's examined hard drives had a capacity of up to 500 GB, and their average lifespan was 3.5 years. The remaining 41% exceeded 500 GB. Due to their construction and additional platters, these larger models are less durable, exhibiting an average lifespan of only 1.5 years. Storelab notes that read/write head failure is somewhat characteristic for WD drives. Failures primarily occur as a result of physical impact or overheating (WD heads can be sensitive at temperatures above 45°C).

Western Digital's construction makes drives particularly vulnerable to shocks and pressure. Unlike other manufacturers, WD does not secure the hard drive axle with a separate screw to the drive cover. Because of this, pressure exerted on the housing or cover can shift the axle, resulting in it changing its angle, and then damaging the platters. The axle's attachment to the cover is another reason. If the cover is moved, the engine may be blocked. Except for this vulnerability, though, WD hard drives are mechanically and electronically reliable.

Wedged Axles from Toshiba/Fujitsu and Samsung

Only 2.5" notebook hard drives from Toshiba/Fujitsu were evaluated in this study, and the average lifespan of these drives was two years. Their most common problem was wedged axles due to defective fluid bearings, usually from aging. The axles on the Toshiba/Fujitsu drives are attached to the cover, but the cover is very thin and subject to deformations. Over time, lubrication liquid in the bearings can evaporate. This gradually increases the friction in the socket, producing splinters that eventually eat away at the axle. Wedging of the axle is one of the worst things that can happen to a hard drive, and data recovery may not always be possible.

Another common reason for failures in these notebook hard drives is the damage caused by the read/write heads falling on the moving platters. Normally these heads float on a thin layer of air over the spinning platters, but if something happens and the two come in direct contact, the platters are usually so badly scratched that the hard drive is unusable. You might hear a faint hum, the drive will be detected in the BIOS, but it may not work anymore. Data is almost always lost if this happens. Mechanical damage from these head crashes is the most common cause of failure in Samsung hard drives.

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  • 22 Hide
    b2man , August 13, 2010 9:24 AM
    Reguardless of the HD manufacutrer, I think all hard drives suffer from one common problem that can either shorten their life dramatically or give you a HD that lasts well over 3 years. And that is the packaging and shipping to your home. The "dropping" of the package at your door. The "tossing" around of the box in the truck. My personal belief is that most hard drives already have a lot of wear and tear before you even install them in your computer. Just my 2 cents.
  • 21 Hide
    obrut , August 13, 2010 7:34 AM
    I have replaced all my Seagate drives with WDs during the last year. My personal study for the last 20 years show that throughout this period only the WD drives show long enough lifespan and reliability. Recently (last 2-3 years) Seagate took quality out of the equation. Currently they are only interested in market share and not the fair name their own brand.
    Again, this is personal study - for example I have used only one Hitachi drive during this period, so I can't make statistics on the base of one.
  • 19 Hide
    mitch074 , August 13, 2010 6:56 AM
    @cmcghee358: because if they didn't put it at least once per page, polemics could be started by any website linking to one page without it said "THG says Seagate drives are crap!".

    Which is true, but only according to a limited, but still relevant (and one of the few available) study.

    But, it correlates pretty well to what I experienced: the only failed Hitachi drives I got (and I got a bunch of them) were due to:
    - manufacturing fault (and RMA worked well and fast) creating faulty sectors,
    - old age (10 years) creating faulty sectors.
    Never once, in the two dozen Hitachi (and IBM) drives I had to manage, was a failure related to hardware fault - even dropping a (not running) 2001 drive from one meter height on solid concrete failed to damage it.

    I tried Maxtor, Toshiba, and WD drives, and most of these eventually developed unrecoverable hardware faults leading to massive data losses; Hitachi drives caused, at worst, a few files to be lost due to irrecoverable sectors (many times, I got SMART warnings before the data became impossible to rebuild).

    I got some Samsung drives recently; they're cheap, and they added shock resistance capabilities in the 2.5" versions, I'll see if they do better than the Hitachi ones (I do backups on Hitachi drives still). If this report is any indication, Samsung notebook drives in RAID 1 array for a desktop machine should allow for reliable operation - the one I have carried around for 2 years in my fanny pack seems sturdy enough, too.
Other Comments
  • 19 Hide
    mitch074 , August 13, 2010 6:56 AM
    @cmcghee358: because if they didn't put it at least once per page, polemics could be started by any website linking to one page without it said "THG says Seagate drives are crap!".

    Which is true, but only according to a limited, but still relevant (and one of the few available) study.

    But, it correlates pretty well to what I experienced: the only failed Hitachi drives I got (and I got a bunch of them) were due to:
    - manufacturing fault (and RMA worked well and fast) creating faulty sectors,
    - old age (10 years) creating faulty sectors.
    Never once, in the two dozen Hitachi (and IBM) drives I had to manage, was a failure related to hardware fault - even dropping a (not running) 2001 drive from one meter height on solid concrete failed to damage it.

    I tried Maxtor, Toshiba, and WD drives, and most of these eventually developed unrecoverable hardware faults leading to massive data losses; Hitachi drives caused, at worst, a few files to be lost due to irrecoverable sectors (many times, I got SMART warnings before the data became impossible to rebuild).

    I got some Samsung drives recently; they're cheap, and they added shock resistance capabilities in the 2.5" versions, I'll see if they do better than the Hitachi ones (I do backups on Hitachi drives still). If this report is any indication, Samsung notebook drives in RAID 1 array for a desktop machine should allow for reliable operation - the one I have carried around for 2 years in my fanny pack seems sturdy enough, too.
  • 9 Hide
    jj463rd , August 13, 2010 7:06 AM
    Oddly enough I had to get rid of some old relics (I.B.M. XT's) from the mid 1980's last year.All 5 of them had hard drives which still worked and the machines were still fully functional.Sad I would have liked to have kept them but there was too much clutter in my house.
  • -3 Hide
    jsowoc , August 13, 2010 7:09 AM
    I'm not sure if my comment is valid, but because Seagate has a lot of market share, its drives are considered "reliable" by many. If I paid a premium for the drive, it's because I have (had?) valuable data on it, and am willing to pay for data recovery.

    Could this be part of the reason why Seagate has more than its fair share of drives sent in?
  • 12 Hide
    Quotidian , August 13, 2010 7:15 AM
    yes, very nice...all my hard drives are seagate...:s
  • 21 Hide
    obrut , August 13, 2010 7:34 AM
    I have replaced all my Seagate drives with WDs during the last year. My personal study for the last 20 years show that throughout this period only the WD drives show long enough lifespan and reliability. Recently (last 2-3 years) Seagate took quality out of the equation. Currently they are only interested in market share and not the fair name their own brand.
    Again, this is personal study - for example I have used only one Hitachi drive during this period, so I can't make statistics on the base of one.
  • 0 Hide
    liquidsnake718 , August 13, 2010 7:34 AM
    Well I live in the Philippines and im not happy to say that almost 2 years ago I bought a WD Passport and it died on me after 3 months. WD or the retailor replaced it for me via the local distributor. However I lost all of my data that was backed up because prior to that my significantly older Seagate serial IDE 80gb with THAT very same data died on me!

    Yeah WD gave me a slightly upgraded HD with 40 more GB but all that info and files that were lost was irreplacable. The problem, was a faulty pin, or the reader that looks like a raptors nail! The device would just click and click and my HDD wouldnt read.
  • 4 Hide
    Anonymous , August 13, 2010 7:38 AM
    I'm not sure why but I don't like Seagate too :)  Most of my hard drives are Hitachi and I've got 2 failures - one after a power surge and another which was some bad sectors, but the drive was 60GB and it was around 3 years old. I have one Seagate drive and it works fine, I've been using it for around 3 years now on a storage server.
    I know a lot of people who had problems with that particular "CC Fly", maybe that is why I don't like Seagate. Nowadays I'm turning to WD, I really want to see how are they doing.
    Btw I have 3-4 40GB Maxtors that are still very much alive and working for about 9 years now :) 
  • 3 Hide
    dragonsqrrl , August 13, 2010 7:38 AM
    I remember reading about some problems with the Seagate 7200.11 series, along with a lot of bad ratings on Newegg.
  • 1 Hide
    Azriel4444 , August 13, 2010 7:43 AM
    The Seagate 7200.11 series was horrible. I avoid them no matter how cheap they are on sale. 7200.12 are way more dependable.
  • 14 Hide
    cmcghee358 , August 13, 2010 7:49 AM
    I would argue that 7200.12 is too new to decern if it's reliable yet.
  • 1 Hide
    thuan , August 13, 2010 8:55 AM
    try "seagate 7200.12 CC34 firmware reallocated sector count on" on google. I have two 500GB drives from Seagate that have the same problem. The one I have with my desktop at home I sold after a few hundred bad sector, the one I have at work I am still using and it has 4574 bad sectors, still going but very slow sometimes. It triggered Seatools of course, but I'm too busy to bring the damn thing to warranty without having another spare, so backing up everyday is now what I do.

    IMO 7200.12 with CC34 firmware is not that great either. FYII have another Seagate 7200.12 CC35 firmware and it has been ok, so it might be another firmware fiasco that Seagate doesn't want to acknowledge after the last generation "Seagate" case.
  • 0 Hide
    cmcghee358 , August 13, 2010 9:12 AM
    ^ Case in point. This also is only a testimony of 2 drives. Except the fact that he suggests there is more information contained in google about that specific firmware. Regardless, the 7200.12 is too new to really say if it's reliable or not. Basically, YMMV
  • 3 Hide
    thuan , August 13, 2010 9:19 AM
    Yeah it might be fixed with later firmware, still I think the attitude that they took by quietly ignore it is wrong, even though there're quite a number of hits on gg to suggest that there is something wrong with this firmware revision. As I said, it might just be another "Seagate" scandal that Seagate decided to keep under the rug to save face.
  • 22 Hide
    b2man , August 13, 2010 9:24 AM
    Reguardless of the HD manufacutrer, I think all hard drives suffer from one common problem that can either shorten their life dramatically or give you a HD that lasts well over 3 years. And that is the packaging and shipping to your home. The "dropping" of the package at your door. The "tossing" around of the box in the truck. My personal belief is that most hard drives already have a lot of wear and tear before you even install them in your computer. Just my 2 cents.
  • 8 Hide
    mitch074 , August 13, 2010 9:43 AM
    @b2man: that's why, ever since HDDs became movable goods (i.e.smaller than a suitcase), they had the capability to have their heads parked. The second 'revolution' is liquid/fluid bearing for the axes... Which reduces/prevents damage from relative motion caused by a shock on the casing.

    I was rather astonished to see the ratings on recent drives: when parked, up to 1000G!
  • -7 Hide
    Anonymous , August 13, 2010 9:44 AM
    FBI should raid Google and make their hard drive analysis public. It's embarrassing how they post their most common hard drive failures but hide the brands involved. Ad revenue really does help to keep their mouth shut.
  • 9 Hide
    mikewong , August 13, 2010 9:47 AM
    I turned to WD a few year ago, from Seagate and I'm still happy with them.
    One thing for sure: backup, backup and backup!
  • 4 Hide
    superhighperf , August 13, 2010 9:47 AM
    this is totally opposite of my experience with HDD. i have had 4 Hitachi drives and they all failed. i will never buy a Hitachi drive again. the price point on their new 7200 rpm 2TB drives is great but i got reamed by them too many times.

    i did have a WD blue 640GB drive fail and got an advanced replacement. that is a great feature and i have bought several WD drives since then.

    the longest running drive i have is an old Quantum Bigfoot from 98'. 5-1/4" 12GB monster that sounds like a vacuum cleaner when it spins up but it still works. not that i ever use it :) 

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