IF commands, which allow to test for sizes in bytes, kilobytes (by appending a K) or megabytes (by appending an M), where 1K is defined as 1024 bytes and 1M is defined as 1024*1024 bytes.This is the first known instance of an operating system or utility using M in a binary sense. DEC RA90/RA92 Disk Drive Service Manual "Storage capacity, formatted" "1.216 gigabytes" 1991 The 19th CGPM defines the SI prefixes zetta, and yotta as 1021 and 1024. May 13: Apple releases Macintosh System 7 containing Finder 7.0 which uses M in a binary sense to describe HDD capacity. The HP 95LX uses "1MB" in a binary sense to describe its RAM capacity. Micropolis 1528 Rigid Disk Drive Product Description "1.53 GBytes" ... "Up to 1.53 gigabytes (unformatted) per drive" "MBytes/Unit: 1531.1" (2100×48,608×15 = 1,531,152,000) Similar to a feature in 4DOS 3.00, the enhanced command line processor 4DOS 4.00 adds support for a number of variable functions (like %@FILESIZE[...]%), taking special arguments to control the format of the returned values: The lowercase letters k and m are used as decimal prefixes, whereas the uppercase letters K and M are used in their binary meaning. 1993 While the HP 48G calculators are labelled 32K or 128K to describe their built-in SRAM capacity in a binary sense, the user manual variably uses the terms KB, KBytes and kilobytes in the same meaning. The enhanced command line processor 4DOS 5.00 introduces the concept of a general size range parameter /[smin,max] for file selection, recognizing lowercase letters k and m as decimal prefixes and uppercase letters K and M as binary prefixes. 1994 Feb: Microsoft Windows for Workgroup 3.11 File Manager uses MB in a binary sense to describe HDD capacity. Prior versions of Windows only used K in a binary sense to describe HDD capacity. Micropolis 4410 Disk Drive Information "1,052 MB Formatted Capacity" "Unformatted Per Drive 1,205 MB" (133.85 MB per surface, 9 read-write heads) The HP 200LX models use "1MB"/"2MB"/"4MB" in a binary sense to describe their RAM capacity. 1995 August: The International Union of Pure and Applied Chemistry's Interdivisional Committee on Nomenclature and Symbols proposed new prefixes kibi (symbol Ki), mebi (Mi), gibi (Gi) and tebi (Ti), etc. for powers of 1024. 1996 FOLDOC defines the exabyte (1 EB) as 1024 petabytes (1024 PB), with petabyte used in the binary sense of 10245 B. Markus Kuhn proposes a system with