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The filesystem described here is used with [[Technology Research Ltd]]'s [[Beta Disc]] and [[Beta 128 Disc]] disk interfaces. The TR-DOS operating system uses this filesystem.
[[Floppy disks]] formatted to 16 sectors per track, with 256-byte sectors. Either single-sided or double-sided disks may be used, and 40 or 80 tracks may be used per side.
The first track of the disk (h0t0s1..h0t0s15) contains the file descriptors (h0t0s1..h0t0s8) and the disk info (h0t0s9). The remaining space on this track is unused.