Most personal from a drive IDE to connect the hard disk and one in order to PCI to add hardware elements to other computer use. The number of other computers of a type in order to name Small Computer System Interface) SCSI) to add the desired elements to computer use. Hardware elements desired can be one of the equipments must not be less than:

- hard disk
- scanners
- CD-ROM/RW
- printer
- Tape

SCSI is a Arcade rapid in order to connect several devices to the computer.

SCSI, etc. of the ideas raised by the Shugart Associates System Interface) SASI) has used . SASI in 1981 by the company Shugart, and in collaboration with the company, NCR innovation, respectively. In 1981, the standard version of the SASI, with the name SCSI supply, respectively. Technology above has advantages following:
- its speed is high ( 160 MB per second )
- safer and more reliable.
- possibility of establishment ( connection ) of several devices on a in order to provides).
- on most systems is applicable.

in conjunction with the technology SCSI considerations there is also:
- for a computer-specific should be configuration-crafted
- features limited support at the level of the BIOS is
- a model different from the day speed and type of connector.
- have a even the software is not