Per disk
the usable capacity of a disk drive
the upper part of a magnetic disk, called {sector}
a disk coated with cellulose acetate
a hard disk that can be removed from the disk drive
the amount of information (in bytes) that can be stored on a disk drive
the disk space that is set aside for virtual memory
That has no particular limit on the disk size.
a device of a computer that drives a floppy disc, called disc drive