The main parameters in the selection of the hard disk are its volume, speed of reading-writing and searching time. It is clear that the higher the disk volume and the higher the speed of searching and exchanging information, the higher the disk productivity. BIOS cannot impact the amount of stored information but it can impact the speed of exchange.
Nowadays most of the hard disks, except the outdated ones, are equipped with internal clipboard, or cache, that enables to exchange data more effectively. All procedures of buffering are implemented at the hardware level, so it is possible to optimize an access to reading-writing only by the IDE-controller. For example, you can significantly speed-up the reading-writing processes of IDE-interface by using the parameter “IDE Data Post Write” (IDE Fast Post Write). This parameter has two values: Enabled and Disabled. To receive the required result while reading-writing, this parameter should be switched on. But it may cause some failures when the IDE-interface has no posted-write buffer. In this case this parameter should be switched off (Disabled).
The speed of implemented procedure plays an important role when reading-writing to a disk. It contains a mechanical component – the speed of disk rotation and the time spent of positioning of reading heads, and an electronic component – the time of data exchange between the disk and controller and also between the controller and operating memory. The mechanical component is invariable while the electronic one can be adjusted to gain better speed.