The hard disk drive in your computer is the place where the data is stored, and the data is at its most current. So, if it fails and there is not a current backup then it can be a very serious problem. Why will a disk fail? Data on a hard drive is stored on a circular platter that spins at anything from 5400 rpm to 15,000 rpm., with a read/write head mounted on an arm that positions it across the platter to access data. This head "floats" very close to the surface by dint of an aerodynamic effect, add to this movement and proximity the potential for heat generation and there is suddenly a lot that can go wrong. Head Crash This is when the head touches the surface of the platter whilst it is spinning, this could be the result of an impact or a mechanical failure within the HDA (HDA is the Head Disk Assembly which comprises the head/platter combination). It is not too difficult to imaging the consequence of such contact, in the worst cases it can strip away the entire recorded surface of the platter leaving just the base material, usually glass. Media Failure Hard disk drives "hide" any instance of media failure to maintain a perfectly readable disk, and prevent operating system problems as the result of unreadable sectors. What they do is maintain a set of spare sectors, and when failures occur they reallocate data to one of these spares. There can come a point where the spares are all used up and the errors begin. Normally the disk is in quite a sever state of failure by now and if the disk is kept working the problems will rapidly multiply. Electronic Failure Hard drives are controlled by circuitry that is susceptible to damage from electrostatic discharge or electrical surge. If a component is on the brink of failing then quite a minor electrical "blip" will push it over the edge. The complexity with a hard drive is that there is code and information stored within memory devices on the drive controller and this is created when the drive is first formatted, so just replacing the electronics will not help. Alignment failure and head failure If any of the read heads within the drive fail, and can no longer turn the magnetic signal going past into something that can be decoded by the drive electronics then again the disk drive has failed. Even if the heads have not failed but mechanical wear means that positioning to the correct place to find data is just not happening, then you can have lots of perfectly well recorded data but not means of accessing it. Bearing seizure Platter rotation has to be nice and smooth, any undue vibration can cause positional problems. Following an impact, or just after prolonged use, the bearings that allow the platter to rotate can crumble and seize. The drive cannot spin the platter and no data can be read. Data Failures Sometimes the problem lies not with the disk but with the person or system that is using it. The disappearance of a partition or files might actually be user error or the result of an application error, the disk might still be working perfectly well. Hard Drive Data Recovery This is the general term for a collection of techniques for getting the data of a failed device and finding a way of returning it in a usable form. This can range from quite a straightforward process, to a highly complex on, and in the worst case an impossible task. It is tempting to depend on the general reliability combined with a belief that in the unlikely event of a failure a data recovery professional can help. Many firms cite 95% + success rates so why worry? First, the only statistic that matters is whether your disk can be recovered from, 500 other disks might have been recovered from 100%, but if yours has crashed beyond redemption then your data has gone. Second, even a low cost data recovery will cost more than a 500GB USB disk, so why risk everything to save virtually nothing? Hard Drive Data Recovery is an option, sometimes a business or marriage saver, but by taking a bit of care it can be an option that you do not need.
Magnetic storage media or hard drive and disks as they are more commonly known today offer almost exponentionialy increasing storage for computer users needs today, such as is required for video, audio and picture files. Adhering to the same footprint and physical size hard drives were first designed with, they have grown massively to currently 1TB (1 Terabyte) for a single hard drive, n relatively short time frames.
Moore's law as it is often called which predicts the pace of CPU speeds and suggests that CPU speed would double every 18 months (something which it has done its inception by Mr. Moore of Intel) there has been no such "law" or roadmap for hard disk drives. All of this extra storage capacity has been very welcome by computer users; however there has been a tradeoff with ever increasing storage capacities and overall longevity of the media, and ultimately the reliability of media holding your all important media.
Spinning magnetic storage media are prone to several areas of weakness some of which is inherent to the internal structure and design, other failure points are external. Hard drive technology is based on a electro mechanical design with spinning platters often made of glass or ceramics then coated via a process called splutter, this layer then is encoded and decoded via a head stack assembly which operates to very precise and repeatable accuracy, a typical modern hard drive will operate to less than 1 micron.
The major internal issues that can be instrumental in failure and data loss are Head Crash, Heat and Power Cycling.
Head crash
This is when the head assembly comes into direct contact with an area of the surface media it is not designed to (some hard drive technology allows the head to land on the inner portion of the media), the contact damage may be exacerbated if the head has suffered from damage and or there may be oxides or other contaminant within the disk enclosure, head crash symptoms usually manifest themselves via unusual noises such as clicking, ticking, scratching or clunking the media must be switched off immediately to preserve any possibility of data recovery. Areal density and bits per inch have squeezed the technology such that inevitably the tolerances of the media are very precise.
Heat
The ambient temperature of the computer system and the hard drive itself also are a concern for data integrity and longevity a simple hard drive cooling fan could save you from data loss, as hard drive media both internally and externally are prone to failure to heat.
Power cycling
Power cycling to hard drive media can result in hard disk failure and can be completely eliminated via a reputable UPS system.
There is nothing more frustrating than losing the important documents or data that you've spent so much time creating. If you have suffered such a loss you know how it feels. The best way to prevent data loss from happening is to be prepared for it. Thus, backuping up your important data on a CD DVD or external Hard drive, using uninterruptible power supply (UPS) units and having in place hard drive cooling fans are crucial actions that can save lots of headaches.
In case of emergency
In case you find yourselves in the unfortunate but likely position of hard drive failure and are unable to recover your data any other way then professional data recovery services exist that can help you get your valuable data back. These services are relatively inexpensive for the data that you probably want to recover. On top of that they usually charge you only if they succeed in retrieving your data.
Both Ada Denis & Giorgos Kontopoulos are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.