document (see page 23). 1972 Lin and Mattson introduce the term Mbyte. 1973 OCEANPORT, N.J., SEPT. 25, 1973 – A 16-bit minicomputer priced at under $2,000.00 in quantities and a 32-bit minicomputer priced at under $6,000.00 in quantities were introduced today by Interdata, Inc. The 16-bit mini, the Model 7/16, includes an 8KB memory unit in its basic configuration, and will be available for delivery in the first quarter of 1974. The single unit price of the 7/16 is $3,200.00. The 32-bit mini, the Model 7/32, includes a 32KB memory unit and will be available for delivery in the second quarter of 1974. The single unit price of the 7/32 is $9,950.00. DEC PDP-11/40 Manual "Direct addressing of 32K 16-bit words or 64K 8-bit bytes (K = 1024)" (Page 1-1) Contrast the 1969 PDP-11 Handbook, which avoids this usage almost everywhere. (Above) 1974 The seminal 1974 Winchester HDD article which makes extensive use of Mbytes with M being used in the conventional, 106 sense. Arguably all of today's HDD's derive from this technology. The October 1974 CDC Product Line Card unambiguously uses MB to characterize HDD capacity in millions of bytes. 1975 The 15th CGPM defines the SI prefixes peta, and exa as 1015 and 1018. Byte Magazine December 1975 article on IBM 5100 includes the following: "User memory starts at 16K bytes in the minimum configuration and can be expanded to 64K bytes (65,536)." Gordon Bell uses the term megabytes: 1976 DEC RK05/RK05J/RK05F disk drive maintenance manual "Bit Capacities (unformatted)" "25 million" | "50 million" (57,600 bits/ track * 406 | 812 tracks = 23,385,600 | 46,771,200 bits) The Memorex 1976 annual report has 10 instances of the use of megabyte to describe storage devices and media. Caleus Model 206-306 Maintenance Manual uses 3MB to characterize a drive having 3,060,000 bytes capacity. The first 5 inch floppy disk drive, the Shugart SA 400, is introduced in August 1976. The drive had 35 tracks and was single sided. The data sheet gives the unformatted capacity as 3125 bytes per track for a total of 109.4 Kbytes (3125 × 35 = 109,375). When formatted with 256 byte sectors and 10 sectors per track the capacity is 89.6 Kbytes (256 × 10 × 35 = 89,600). 1977 HP 7905A Disc Drive Operator's Manual "nearly 15 million bytes" with no other abbreviations 1977 Disk/Trend Report – Rigid Disk Drives, published June 1977 This