| It is/was the usual British usage. See https://en.wikipedia.org/wiki/Spelling_of_disc The OED includes these references: 1947 Math. Tables & Other Aids Computation 2 229 The program of the Symposium was as follows:..4. ‘Magnetic and phosphor coated disks’ by Dr. B. L. Moore. 1952 Electr. Engin. (U.S.) Aug. 745/2 When the heads are in position, the disk is rotated past them while information, in the form of coded magnetic pulses, is recorded or read out. 1964 T. W. McRae Impact Computers on Accounting i. 8 48 disks were stored one above the other. 1972 Computer Jrnl. 15 290/1 Engineering information files set up on disc by Hawker Siddeley Aviation Ltd..form the data base for a fully integrated production control system. 1982 What's New in Computing Nov. 12/4 Back up for the discs is provided on a tape streamer, tape cartridge or floppy. 1990 G. Gilder Life after Television (1992) iii. 63 A computer with a hard-disk memory, together with a compact disc read-only memory. The last one has K for magnetic disks and C for optical discs. See https://www.oed.com/view/Entry/53642 |
The Wikipedia article affirms this convention as well, which begs the question: solid state disk drive? solid state disc drive? solid state brick drive?