Information gets written on the fast-revolving platter by the read write head. This head is mounted on an actuator arm that moves rapidly across the disk. As the actuator arm has to move at a great speed it is constructed using a linear motor.
A hard disk drive contains numerous platters to enable more storage of information. Subsequently, there are numerous read write heads too. A hard disk drive with three platters contains six read write heads.
Manufacturers across the globe make hard drives. But every hard drive needs replacements for issues which even the SMART flags do not determine. (SMART exists for surveying the health of hard drive.) Failure rates in hard drive are usually age- or model-related. And, failures lead to data loss necessitating data recovery.
Need for Data Recovery
Loss of data can either occur due to the physical failure of the hard disk drive or its logical malfunctioning. A physical damage to the hard drive occurs due to a fall of the computer, or damages caused by the effect of water, heat or sudden electric spike. Logical corruption of the data occurs due to accidental deletion of files, virus attacks or reinstallation of OS.
Such physical and logical failures are becoming quite common for the following reasons:
- Technological changes resulting in smaller head drives that are quite close to the read write heads increase chances of an accident.
- The high volume of data generated and the decentralised manner of its collection and storage increase incidences of data loss.
- Increasing access to internet increases virus threats.
Data loss is immediately followed by attempts at retrieval and data recovery services are sought as the last option. Different methods of recovery are used depending upon the cause and extent of the damage. Normally, problems begin as a bad sector and finally assume great magnitude.
Who makes Hard Drives?
Hard drives are manufactured by different companies all over the world. The first manufacturers of hard drive were IBM who manufactured it 4 decades back.
Manufacturing of hard drives necessitates plenty of research as the markets constantly require competitive products. As a result, smaller players are soon removed for they fail to withstand competition.
Currently, there are a few major players and each of them specialises in some segment of the market. One company is famous for releasing high-speed hard drives with speeds ranging form 5,400 to 15,000 rpm. This company also specialises in manufacturing cheaper and voluminous drives especially for desk tops.
Another giant company in Japan produces fast and reliable hard drives for notebooks. There was another company whose products were priced cheap abut lacked quality. The qualitative deficiency was soon rectified and today the products are so good that they are able to afford a warranty of three years on all their products.
Hard Dive - Interfaces
There are different types of interfaces for a hard drive. Each type has its own advantage and disadvantage.
- Enhanced Integrated Drive Electronics (EIDE) is popularly common. It is simple to set up and can handle enormous amounts of data. The disadvantages are that it needs huge cables and they are comparatively slower.
- Serial Advanced Technology Attachment (SATA): The advantages of SATA drives are that they are very fast and its cable is a thin wire. It is easy to set it up. But it is comparatively expensive.
- Small Computer System Interface (SCSI) is faster compared to EIDE and SATA. It is also faster to boot. But this is also very costly.
Actually, hard drives are all similar; the only difference that exists is the differences in the controller.
Hard drives are one of the most important parts of a computer. Different companies manufacture hard drives with different controllers, but no company can guarantee against failure. Whenever there is data loss due to a failure, the data recovery companies are of great help.