# Weak Disk Data

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 files.