SCANBLOCKS
a.bp = geteblk(SCANBLOCKS * (int)lp->d_secsize);
if (read_sector(a, label_sector, SCANBLOCKS)) {
a.bp = geteblk(SCANBLOCKS * (int)lp->d_secsize);
#if LABELSECTOR*DEV_BSIZE + LABELOFFSET > SCANBLOCKS*DEV_BSIZE - DISKLABEL_SIZE