Some copy
protections have what is described as `weak/random’ data. Each
time the sector is read one or more bytes will change, the value
may be random between consecutive reads of the same sector. Two
disk image formats (Extended DSK and UDI) can store this type of
data. Fuse can read and use weak sector data from EDSK and UDI
files when present, and can save back weak sector data to UDI
image format.