On z/VSE 4.1 ... with interface to DYNAMCMS ... and IBM 3494 Robot
after drive was attached by DYNAMCMS we received:
F3 0014 0P24I C PROG CHECK SYS251=900
F3 0003 0P73I I/O ERROR
An error of this kind may occur, if an error in the definition of the density for a tape dataset is made. For example:
The density associated with drive 900 (for example, '08M') has been removed (by mistake) from the catalog DSN entry !
The density defined in the catalog DSN entry does not match the density that can be written by drive 900 !
The VOLSER mounted on drive 900 has been initialized with the wrong density !