Which of the following standard technologies is not used to interface hard disk with the computer?

USB (Universal Serial Bus) is a standard interface that supports connecting external hard drives and storage devices, including USB-attached SATA drives and native USB flash storage.

SCSI (Small Computer System Interface) is a mature parallel interface standard historically used to connect internal and external hard disks, tape drives, and optical drives.

IDE/ATA (Integrated Drive Electronics / Advanced Technology Attachment) is the classic parallel interface standard specifically designed for connecting internal hard disks and optical drives to a computer's motherboard.

PS/2 (Personal System/2) is a 6-pin mini-DIN connector standard introduced by IBM solely for keyboards and pointing devices. It has no data transfer protocol or electrical specification for storage devices, and was never designed or used as a hard disk interface standard.