Magnetic Disks

The subject of a disk (hard disk) disk contains many physically related phenomena. The complex structure and design of "disk" (or hard disk) in a computer includes the principle of fluid flow, rotational motion, and electromagnetism. This article will focus on designing the disk to include the physical events mentioned above and their designs. The use of these physical principles makes hard drives a modern very common and useful tool.

Disk: The storage function provided by the disk is much more flexible than tape. The disk surface is divided into physical locations. It is a direct access medium. Disk supports the following file organization method serial, sequential. The CD ROM uses tracks to store data, and the tracks are very close. They have large storage capacity, can hold about 600 MB of information, and can access the media directly. In the latest CD, you can continue to add information by entering information.

The built-in floppy disk is magnetic. The disk stores the binary data as a magnetic pattern on the surface of the disk. You have to look after the disc, and you have to avoid things like hot or magnetic surfaces. For data, a normal 5-inch floppy disk has a capacity of 44 MB. Before saving the data to disk, you need to format the disk. This creates a magnetic map of the disk surface and can read the data from the disk or quickly write it to the disk. A hard drive usually consists of multiple disks on a single spindle. As shown in Figure 4, each disk has the advantage of being able to store data, each side can have its own read / write head. This allows the read / write head to operate at the same time. This means that you can transfer data faster than using one big disk. Hard drives are available in various sizes and larger drives are always available

In RAM and solid-state hard drives, data is stored as voltage transferred through a series of multiple transistors. On older rotating disk hard drives, data is stored in magnetic format in a specific arc of the disk. When indexing information on a computer, we create an algorithm that maps part of the data to the physical location in the computer. This place is called an address. In a computer, what is indexed is always a data bit and the index is used to map the data to those addresses.