DiskDupe can only use image files made with DiskDupe.
DiskDupe image files are forward compatible. DiskDupe versions 4.05
and above add CRC's to the image files when they are created. When
pre-4.05 DiskDupe images are read for the first time by a current
version of DiskDupe the image file gets a new time stamp because
DiskDupe adds CRC's to the image and marks it as "updated".
If DiskDupe is reading in a pre-4.05 DiskDupe image file and it gets
interrupted for some reason the image file should not be marked as
updated, as the CRC's are added as the last step. On rare occasions an image file can be marked as updated even though the CRC's have not
yet been added. In this case if the image file is read again then
DiskDupe will report an error 908, "Image file has been corrupted",
because it sees that the file is marked as updated, but cannot find
the CRC's. To mark an image file as "not yet updated" one byte needs
to be changed from a one to a zero.
For example to mark a file called
IMAGE1.DDI using Dos DEBUG you would type the following:
debug image1.ddi
-e 103 0
-w
-q
