I managed to figure it out. After creating the tape directory and trying a few different combinations of the switches I finally got it with using wildcards.

cpio -AvicdumkB -I/dev/rct0 u/prd*/MUMPS*

Mumps is the name of the file and it's extension is .DAT in the prd directory but it's .EXT in each subsequent directory so cpio will play nice with the wilcard.

Many thanks for pointing me in the right direction. I fear I would have been pulling my hair out trying to figure this out.

Hnelson