The disk: Castle Master (1990)(Incentive)(+3)[a].dsk looks like truncated after track 20 sector 1.
In the Track-Info block we have 9x512 byte length sector, but we have data only for 1 sector (512 byte). 4096 byte data is absent.
This bug related to [bugs:#450]
With this patch fuse can load truncated dsk images, only print some warning to stdout.
Now Castle Master load and start.