According to version 2.2 of the SCP image specification
<https://www.cbmstuff.com/downloads/scp/scp_image_specs.txt>
the number of Track Data Entries for a floppy can be up to 168,
so that up to 84 tracks can be recorded (e.g., fluxengine -c 0-83).
> BYTES 0x10-0x2AF (for floppy image files) are a table of longwords with each entry being
> an offset to a Track Data Header (TDH) for each track that is stored in the image. The table
> is always sequential. There is an entry for every track, with up to 168 entries supported for
> floppy disks. This means that floppy disk images of up to 84 tracks with sides 0/1 are possible.