Why Do Hard Disks Fail?

Posted on timeMay 29th, 2009 by userAdvisor


It is very simple to forget how long we have the ability to all spend working on an important university or business document or PowerPoint presentation, if you were to add it all up it could amount to days and on occasions weeks but what do you do when you suddenly find the file has simply vanished from your personal.

You check your deleted files with no luck and do a full search on your computer but the file or folder has simply vanished. In all probability the file is still on your hard disk but for some reason can’t be found which may be the first signs of a degraded drive.

Much as we would like to believe a hard drive won’t last forever but has a definitive life expectancy which is often referred to as a mean time between failures (MTB). MTB can often be used as a reference to a drive future reliability and calculations would put expected drive failures at less than 0.1 percent.

But oh if life was so simple!

A question often asked is how long should a hard drive be expected to last before requiring replacement?

This is one of those wide open questions that will have experts arguing until the cows come home because there are a wide variety of factors that come into play.

The first major aspect is of course the use that a personal is put through during its lifespan. Many home users only use their Pc very occasionally and store relatively small numbers of files or photos. In this scenario it would be nice to anticipate a drive to last over 5 years (don’t assume this though).

Pretty much the same could be stated for a mid usage machine as well for example a pc used for office work or accounts perhaps. So you might never experience drive degradation or drive failure.

But if your system is used for extreme gaming, computer aided design, Digital content creation or virtual prototyping then the hard disk will be working massively harder than in the previous two scenario’s so it would only be expected that true life expectancy would be a lot shorter.

High end computer users using high end applications will often have a much shorter expected life of their system, and desktop refresh tends to be around 3 years or so to avoid disk failure and to keep them at the slicing edge of computing productivity which is important for a business.

If a hard working drive’s life were to be extended then it would be reasonable to see an increasing ramp up in disk failures over time or drive degradation.

During challenging economic times, business computer refresh programs are often put of to protect working capital which on the face of it can be seen as a sound business decision but there can be a huge bite to this policy if an essential drive or server fails with a resultant loss of business critical data.

Any business should in today and age have effective remote data backup and disaster recovery policies in place especially if postponing a business system upgrade.

Other factors affecting hard disk lifespan are the environment the computer is running in and basic system maintenance for example a poorly maintained Pc can become literally clogged with dust and get very hot. Heat is a major factor of drive failure as is hard disk fragmentation, so proper system maintenance is conducive to reliable disk performance.

You should be able to recover a deleted file or a lost file provided you have not overwritten the sector with additional data, so if the file is really important try not to write anything else to the drive, and avoid the temptation to use data recovery software for important files.

Most professional data recovery companies will be able to restore your deleted or lost files even if your drive has degraded and even if your drive has bad sectors that are unreadable hard drive recovery and file recovery are often very successful.

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