MTSETBSIZ
{ CMD("blocksize"), MTIOCTOP, MTSETBSIZ, 1, 0 },
{ CMD("setblk"), MTIOCTOP, MTSETBSIZ, 1, 0 },
{ LINUX_MTSETBLK, MTSETBSIZ },
case MTSETBSIZ: /* set block size; 0 for variable */
case MTSETBSIZ: /* Set block size for device */
case MTSETBSIZ: