CHQFSA0

The structure that XXDP+ uses for storing files on media is unique to XXDP+. The structure was originally based on DOS-11 but it has since been modified to accommodate the needs of XXDP+, although many similarities still exist.

XXDP+ supports both random access and sequential access type devices. A directory index structure is used for accessing files on random access type devices such as disks. For sequential devices like magtape, a header record containing file information precedes each file.