This qualifier is valid for Files-11 output files only. Determines whether protection is set for an RT-11 output file. The owner UIC of the output file is the UIC of the current process. Protection attributes for Files-11 output are taken from the current process default protection. Requests that if an RT-11 output file already exists with the same file specification as that entered for the output file, the existing file is to be deleted before the copy proceeds.
COPY allocates new space for the output file.
By default, COPY creates the new file first and then, after the copy operation is done, deletes the previous file. This can be a problem if the input file has been corrupted because the previous version of the file will have been deleted. This qualifier is valid for DOS-11 magnetic tape only. For RT-11 volumes, specifies the logical block number where the file is to be placed. This qualifier is especially useful with TU58 tape cassettes, because performance can be significantly enhanced by careful placement of files.