Floppy disk variants: Difference between revisions

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Revision as of 01:47, 1 May 2023

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=== {{anchor|MCD-1}}3-inch "MCD-1 Micro Cassette" ===

[[File:MCD-1 Commodore 3" floppy (crop filter).jpg|thumb|right|MCD-1 drive and disk cassettes]]

A magnetic disk in a hard plastic shell was invented by {{ill|Marcell Jánosi|hu|Jánosi Marcell}}, who was working at the Hungarian Budapest Radio Technology Factory ({{lang|hu|Budapesti Rádiótechnikai Gyárban}}, BRG), in 1973.<ref>
{{cite web

| url=https://ajovomultja.hu/mcd-1-casette-floppy-marcell-janosi?language=en

| title=MCD-1 cassette floppy drive

| publisher=Informatika Történeti Kiállítás

| language=en

| access-date=2023-05-01

| url-status=live

| archive-url=https://web.archive.org/web/20230207212332/https://ajovomultja.hu/mcd-1-casette-floppy-marcell-janosi?language=en

| archive-date=2023-02-07

}}</ref><ref>{{cite web

|url=https://patents.google.com/patent/HU170790B/en?inventor=Marcell+Janosi |title=Patent: Casket type storing system for rotating flexible disk

|last=Jánosi

|first=Jánosi Marcell

|date=November 30, 1974}}

|date=November 30, 1974}}</ref> In 1982, such a product, the 3-inch MCD-1 was announced internationally and [[Jack Tramiel]] showed interest in using the technology in his [[Commodore International|Commodore]] computers, but negotiations fell through.<ref name="MCD-1_1"/> Versions of the floppy drive was released in minimal quantity for the [[ZX Spectrum]] and [[Commodore 64]], and some computers made in East Germany were also equipped with one.<ref name="MCD-1_2"/> The floppies are single sided and can hold up to 149 KB of data when [[Modified frequency modulation|MFM]] formatted. The drives were compatible with contemporary [[Floppy-disk controller|floppy controllers]].<ref name="MCD-1_3"/><ref name="MCD-1_4"/> Production was very limited in the early 1980s due to manufacturing problems and the product was abandoned by 1984 after the industry adopted a standard 3.5 inch format.<ref>{{cite book

|last=Porter |first=James |date= December 1985 |title=Flexible Disk Drives |publisher= Disk/Trend Inc. |page= MFGR-23}}</ref>