Rookie must know hard drive parameters

Speed: Refers to the drive spindle motor per minute (drive disk) of the speed, such as 5400 RPM on behalf of the hard drive spindle speed of 5400 revolutions per minute. Desktop hard disk speed is still 7200 rpm, and the main notebook speed is from 5400 to 7200 rpm, performance improvement is very obvious.

Single disc capacity: One of the most important parameters of the hard disk. A hard disk is a combination of multiple storage discs, and a single disk capacity refers to the maximum amount of data a storage disk can store. At present, with the help of vertical recording technology, the single disc capacity has been developed to 667GB. It can not only improve the total capacity of the increase, is conducive to lower production, improve the stability of the work, and the larger the single disc capacity of the faster the internal data transfer rate.

Mean seek time: the time, in milliseconds, that the hard disk moves the read and write heads to the specified track to find the corresponding target data. When the single disc capacity increases, the head's seek action and the moving distance decrease, which reduces the average seek time and speeds up the hard disk access speed.

Caching: A temporary location where the hard disk and external exchange data. Hard disk read/write data, the cache is like a transit warehouse, constantly write data, empty and then write data. At present, most of the hard disk cache has reached 32MB, while for large-capacity products are 64MB.

Internal data transfer rate: Refers to the hard disk head and the data transfer rate between the cache, simply said that the hard disk will be the data from the disc, and then stored in the cache speed. Internal transmission rate can clearly show the hard disk read and write speed, it is the height of the evaluation of a hard drive overall performance of the decisive factor. At present, most desktop-level hard disk is basically between 70-90mb/s, notebook hard drive is around 55mb/s.