In the past computer storage devices were very expensive, very unstable, and extremely small in capacity. That time computers did not interfere most of our life affairs so it wasn’t really a matter to the overwhelming majority of people that computers were coming in very steep prices. But with the last developments in all aspects of life and the need for high technologies to manage the ever-increasing demands on digital processes, the computer technology had to evolve more and more to meet those demands and to take our life to the next level of communication and ease. One of the most essential peripheral that took the attention of developers is the storage device.
With the avalanche of data flowing on computer from the Internet everyday, the strong requirement for a best internal hard drive has dramatically increased to extreme levels. The magnetic surface of each platter is divided into small sub-micrometer-sized magnetic regions, each of which is used to represent a single binary unit of information. A typical magnetic region on a hard-disk platter (as of 2006) is about 200–250 nanometers wide (in the radial direction of the platter) and extends about 25–30 nanometers in the down-track direction (the circumferential direction on the platter), corresponding to about 100 billion bits per square inch of disk area (15.5 Gbit/cm2). This is not a procedure for the technically inept or faint hearted. The following carries no guarantees, and definitely voids and nullifies any existing warranty. The hard disk drive (HDD) is constructed of a few essential parts that give it the ability to function and operate as it does now. The material of the main magnetic medium layer is usually a cobalt-based alloy. In today’s hard drives each of these magnetic regions is composed of a few hundred magnetic grains, which are the base material that gets magnetized. As a whole, each magnetic region will have a magnetization. Interleaved with the platters, lightweight actuator arms, one for each platter side, swivel in unison on a pivot, controlled by a coil in the pivot mechanism. Each of these arms is tipped by a drive head, which is mounted on a tiny suspension mechanism that’s designed to fly, thanks to a law known as Bernoulli’s principle, a minuscule distance above the platters. The heads ride above the surface on a cushion of air that is created by the spinning of the platters.
Using A Hard Drive
The platter surfaces are coated with a thin film that stabilizes the magnetically reactive particles that are spread across the disk. Know that this is only a last resort. You have tried everything else, your data is not extremely important, and/or your cash flow restricts the use of a professional service. These particles represent data as vast series of positive and negative charges. To “write” data, the drive heads change the particles’ magnetic orientation via current passing through a coil, in essence “flipping” them as needed. When the computer is turned on, these platters will begin to rotate at so many rotations per minute (RPM). This rate varies depending upon the model of hard drive you have; an example of how fast a hard drive may spin is 7200 RPM. Now even a hard drive for gaming cannot be always a good solution for the problem you face with slow video games. In recent drives, a separate giant magnetoresistive (GMR) head performs the read functions, detecting particles’ magnetic resistance at the quantum level. One reason magnetic grains are used as opposed to a continuous magnetic medium is that they reduce the space needed for a magnetic region. In continuous magnetic materials, formations called Neel spikes tend to appear. These are spikes of opposite magnetization, and form for the same reason that bar magnets will tend to align themselves in opposite directions. Above is a graphic example of what the inside of a hard drive looks like and examples of a hard drive platter. As can be seen in the desktop computer hard drive this drive has three different platters. These cause problems because the spikes cancel each other’s magnetic field out, so that at region boundaries, the transition from one magnetization to the other will happen over the length of the Neel spikes. This is called the transition width. This signal is amplified and fed to the drive electronics, which perform error correction and convert data into a PC-usable format.