TR-DOS filesystem

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File Format
Name TR-DOS filesystem
Ontology
TR-DOS is an operating system for ZX Spectrum personal computer with Beta Disc floppy drive interface. Despite being developed by British company Technology Research Ltd, it was not especially popular in the West, but was more popular in USSR and post-USSR in 80-90s.

5¼" and 3½" floppies (ZX Spectrum Beta Disc 5.25" floppy and ZX Spectrum Beta Disc 3.5" floppy) are used with the following formats:

Number of tracks per side Number of sides Number of tracks (total) Number of sectors Number of bytes
80 2 160 2560 655360
40 2 80 1280 327680
80 1 80 1280 327680
40 1 40 640 163840

Diskettes can be dumped to TRD files for use in emulators.

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