Hard Disk Capacity and Features

Hard Disk Capacity and Features

Disks and enclosures with a much more robust than other storage media, hard drives have endurance allows higher. Capacity is much larger, with data transfer speeds much faster. Now, is not rare to hear the hard drive with capacities up to 500 GB, and spindel speeds up to 10,000 rpm. This can result sequential transfer speed 80 MB / s. Whereas for notebook hard disks, already available by 7200 rpm for high performance. That's the main advantage disk, compared to other storage media.

Plat on Disk Technology

Actually, the disk plate in the disk made of non-magnetic material. The most widely used material is glass (Si-Ge) or aluminum. And then coated with a layer of thin magnetic materials. Previous disk-disk using a magnetic coating material of iron (III) oxide. As for hard drives is now using a mixture of materials cobalt and aluminum. This is more minimize the risk of corrosion, and make it more reliable.

Magnetic layer on the disk plate, divided into very small regions. Each region represents 1 binary unit of data information is written. In the magnetic region, there are magnetic grains, which each have their own poles. When data is written, it is expected the combined magnetic field of magnetic grains will produce a particular pole. Each magnetic region will have a magnetic field with a particular magnetic pole, according to the data.

The process of encoding data, by reading the magnetic pole changes, from one magnetic region to another region. If there is a change (reverse) between regions and another reverse in the next region, will be regarded as '1 '. If no changes (no reverse) and then there is a change in the next region (reverse), regarded as '0 '.

The task was read head that reads changes in the magnetic fluctuations in the region. In the previous disk, read head of a very small inductor. Equipped with paramagnetic materials, to strengthen the sensitivity. When through the border region of magnetic read head will have a magnetic flux. By the inductor, this flux will be converted into electricity.

In the latest hard drives, is no longer using inductors, but the use of Giant Magnetoresistive effect, which is a breakthrough in quantum mechanics. Making more sensitive read head again, also maintain data reliability

Why Use Magnetic Grains?

One of the main objectives used magnetic grains (magnetic beads) is shrinkage space required, compared with continuous medium magnetic. With magnetic beads, the distance between the magnetic transition region can be made more minimal. The smaller the magnetic beads are used, the smaller the distance too transitions between regions.