Hard drive is a secondary storage device where data is stored as magnetic pulses on a rotating metal disc that is integrated. Data is stored in concentric circles called tracks. Each track is divided into several segments, known as sectors. To perform read and write data operations to and from disk, hard disk using the head to do it, which is in every dish. Head is the next move to find a sector-specific sector to do the operation against him. The time required to find the sector is called seek time. After finding the desired sector, the head will rotate to look for tracks. The time required to find the track is called latency.
Hard disk storage media is designed to be used to save data in a large capacity. It is against the background of the application programs that are not allowed within a diskette and also requires a large file storage media such as an agency database. Not only that, the hard drive is also expected to be offset from the speed of access. Hard drive speed when compared with the usual floppy, so far. This is because hard drives have different mechanisms and materials technology are certainly better than regular floppies. If no hard disk, you can imagine how much that should be provided to store data of any public employment or storing the application program. This is of course inefficient. Plus a very slow reading time when using the conventional disk storage media.
