Bryan Parkoff wrote:
You made me think of a question. Does the fact that these copy protected disks are 20+ years old make them harder to copy or more fragile to read?Before Michael jumps in and says "No" ;-) I've got several old protected disks that don't work reliably any more because the protection fails in just one place. Obviously DOS disks are more tolerant of certain kinds of failure, and certainly easier to recover. Whatever the cause, this is another reason why I'm putting what little free time I have into researching a new way to make archival images.Again, I mentioned previous thread. Present time is boring. Go back to the past time is fun.You ocnclude that EDD+ is not always reliable to copy from original disc to backup disc using copy-protected scheme successfully FDI tool is the biggest reach to go to make all backup images.
EDD+ simply solves the problem of reliably capturing the bit image of a track--it does nothing novel to deal with fractional-track, partial- track detection and synchronization issues. To automatically analyze and bypass an arbitrary copy protection scheme based only on the knowledge that Track 0, sector 0 is booted by the Disk ][ Controller boot ROM would be an ideal solution--which is unfortunately equivalent to the "stopping problem", and therefore algorithmically unsolvable. -michael NadaPong: Network game demo for Apple II computers! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it's seriously underused."