TAPE_SENSE_LENGTH
sensep = kmem_zalloc(TAPE_SENSE_LENGTH, KM_SLEEP);
*c++ = TAPE_SENSE_LENGTH;
com->uscsi_buflen = TAPE_SENSE_LENGTH;
amt = (int)TAPE_SENSE_LENGTH - com->uscsi_resid;
kmem_free(sensep, TAPE_SENSE_LENGTH);