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The -A attach time switch implicitly means to open files in append mode. Some devices used -A to indicate ASCII data or AUTOSIZE of disk or fixed size tapes - DECtape. These devices are either read only devices (Paper tape readers or card readers), so explicit forcing of the attach to be -R avoids unexpected positioning errors. The random access Disk and fixed sized tapes buffer the container contents in memory so append mode isn't relevant, but care must be taken to assure that the buffer reading starts at the beginning of the file without regard to the explicit open mode. As reported in #821