disk_error/65_NO_BLOCK                                   disk_error/65_NO_BLOCK
 
 NUMBER
     65

 MESSAGE
     NO BLOCK

 DESCRIPTION
     This message occurs in conjunction with the B-A command. It indicates 
     that the block to be allocated has been previously allocated. The 
     parameters indicate the track and sector available with the next highest 
     number. If the parameters are zero (0), then all blocks higher in number 
     are in use.