Issue No.07 - July (1977 vol.10)
D.A. Michalopoulos , California State University
Shugart's new SA850/851 double-sided floppy stores up to four times the data of a standard floppy drive?or 1600K bytes unformatted and 1200K bytes formatted.
D.A. Michalopoulos, "New Products", Computer, vol.10, no. 7, pp. 78-83, July 1977, doi:10.1109/C-M.1977.217790