In a way, yes. If its an external hard-drive then it is for sure.
No,hard disk is not a peripheral device it is esseintial part of computer
Hard disk
A computer hard disk or hard drive (fixed disk) is hardware.
A micro processor is commonly thought to be the central processing unit of a computer system. This CPU may contain peripheral devices on the same chip, and connects to peripheral devices located on different chips. Thus, a micro processor is not commonly thought to be a peripheral. However, a micro processor is often used to create a peripheral device. For example, a hard disk drive is a peripheral device to your PC's CPU. However, the electronics within that hard disk drive itself may contain another micro processor. This micro processor acts as the CPU within the realm of the hard disk drive, but towards the total PC system, it implements a peripheral device of the central processing unit.
The computer's hard disk is hardware.
Simply connect your external hard disk to your computer. Then select the songs you want to play later, copy them and paste to your computer hard drive. And after disconnecting your external hard disk you can now play the selected songs from your computer hard drive.
SCSI interface would be what you're looking for.
The best way, I think to answer that is to define what a computer (or in this case the motherboard of the computer) needs to find or identify a hard disk. A hard disk needs a power source, a connector to attach it to the motherboard, and a controller to talk to the microprocessor of the computer. If any of these things fail the hard disk will not function and the computer will not recognize it. In general when you see the message "hard disk not found" its because the computer can't recognize the hard disk. This can be from a bad cable (that connects the hard disk to the motherboard), no power to the hard disk, or a failed controller. In my experience, its usually a bad cable but there are times when the hard disk itself will fail. Generally, hard disk cables are far more fragile than hard disks.
The OS is stored in the Hard Disk of the computer.
a hard drive is built into the computer whereas a hard disk is seperate
to make the computer function
depends on the computer