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The Brother Micro Disc was a floppy disc for use in the standalone Brother MD-200 Micro Floppy Disc Drive for use with certain Brother electronic typewriters (seemingly some of the EM series of the 1980s such as the EM-200) and possibly for use with industrial sewing or embroidery machines.

It consists of a 2.5-inch flexible disc in a carrier. The discs were available in either double-sided or single-sided form.

https://obsoletemedia.org/brother-micro-disc/