There is a discussion of the origin of the term "partition" in storage devices such as HDDs at: https://en.wikipedia.org/wiki/Talk:Disk_partitioning#Where_did_the_term_%22p artition%22_originate?
It seems clear it was used in memory well before HDDs but when it got started there is unclear. * IBM PC DOS v2 was an early user in 1983 with FDISK and its first PC support of HDDs * UNIX, Apple OS's and IBM mainframe all seem to come later. Partitioning as a "slice" probably predates IBM PC DOS v2 Would appreciate some recollections about DEC usage, other minicomputers and the BUNCH. You can either post directly to Wikipedia or let me know; links to references would greatly be appreciated Tom