=> R0 = disc record of particular format
R1 = pointer to defect list
R2 = pointer to null terminated disc name
R3 = image file handle
<= R0-R3 preserved
This call lays out into the specified file a set of structure corresponding to the identified format. The format identifier is a pointer to a disc record. An error is returned if the specified format can't map out defects, and there were defects in the defect list.
This call isn't available under RISC OS 2.
See PRM 2, page 237.
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