EXCHANGE, INITIALIZE, Qualifiers, /REPLACE
*Conan The Librarian
/REPLACE=RETAIN Retains, when an RT-11 volume is initialized, the bad block replacement table and any existing FILE.BAD files. The RETAIN option is required; EXCHANGE cannot build a replacement table for a volume. The RT-11 system builds and uses the table based on specific hardware error conditions. The OpenVMS I/O system is different, and cannot be relied upon to generate exactly the same error conditions. Therefore, it is not possible for EXCHANGE to generate the same replacement table that would be generated by RT-11. If no replacement table is present, the qualifier /REPLACE=RETAIN is equivalent to /BADBLOCKS=RETAIN.