what is TAPI operation when stsarting up a computer?

Answer 1

ATAPI (Advanced Technology Attachment Packet Interface) is an interface between your computer and attached CD-ROM drives. Most of today's PCs use the standard Integrated Drive Electronics (IDE) interface to address hard disk drives. ATAPI provides the additional commands needed for controlling a CD-ROM drive so that your computer can use the IDE interface and controllers to control these relatively newer devices.