first edition of the annual report on the hard disk drive industry makes extensive use of MB as 106 bytes. The industry, in 1977, is segmented into nine segments ranging from "Disk Cartridge Drives, up to 12 MB" to "Fixed Disk Drives, over 200 MB." While the categories changed during the next 22 years of publication, Disk/Trend, the principal marketing study of the hard disk drive industry always and consistently categorized the industry in segments using prefixes M and later G in the decimal sense. VAX-11/780 Architecture Handbook 1977–78. Copyright 1977 Digital Equipment Corporation. Page 2-1 "physical address space of 1 gigabyte (30 bits of address)" The initial hardware was limited to 2 M bytes of memory utilizing the 4K MOS RAM chips. The VAX11/780 handbooks use M byte and Mbyte in the same paragraph. 1978 DEC RM02/03 Adapter Technical Description Manual "The RM02 or RM03 Disk Drive (Figure 1-1) is an 80M byte (unformatted; 67M byte formatted) ... storage device ... in the 16-bit format, the maximum storage capacity is 33,710,080 data words per disk pack" (33,710,080 * 16/8 = 67,420,160 8-bit bytes) 1979 Fujitsu M228X Manual "Storage capacity (unformatted)" "67.4 MB", "84.2 MB", etc. "20,480 Bytes" per track, 4 tracks per cylinder, 808+15 cylinders = 67,420,160 bytes Sperry Univac Series V77 Microcomputer Systems Brochure, Circa 1978, Printed July 1979 Page 5: Table list memory options as 64KB, 128KB, and 256KB. Memory Expansion is up to 2048KB Page 9: "Memory for the V77-800 is available in 128K byte and 256K byte increments up to a maximum of 2 megabytes" Page 21: Moving Head Disks – units up to 232 million byte disk pack systems. Diskette – storage of 0.5 MB per drive. 1980s 1980 Shugart Associates Product Brochure, published June 1980 specifies the capacity of its two HDDs using megabytes and MB in a decimal sense, e.g. SA1000 formatted capacity is stated as "8.4 MB" and is actually 256×32×1024 = 8,388,608 bytes. Shugart Associates SA410/460 Data Sheet published October 1980 contains capacity specifications as follows: The same data sheet uses MByte in a decimal sense. 1981 8086 Object Module Formats "The 8086 MAS is 1 megabyte (1,048,576)" Quantum Q2000 8" Media Fixed Disk Drive Service Manual "four models ... the Q2010 having an unformatted 10.66 Mb capacity on one disk platter and two heads, the ... 21.33 Mb ... 32.00 Mb ... 42.66 Mb" (1024 tracks × "10.40Kb" per