MAXSECTS
off += MAXSECTS, dest += MAXSECTS * DEV_BSIZE, nsect -= MAXSECTS) {
n = nsect >= MAXSECTS ? MAXSECTS : nsect;
off += MAXSECTS, dest += MAXSECTS * DEV_BSIZE, nsect -= MAXSECTS) {
n = nsect >= MAXSECTS ? MAXSECTS : nsect;