AAC_BLOCK_SIZE
br->SectorCount = bp->bio_bcount / AAC_BLOCK_SIZE;
bw->SectorCount = bp->bio_bcount / AAC_BLOCK_SIZE;
bw->BlockNumber = offset / AAC_BLOCK_SIZE;
bw->BlockNumber = offset / AAC_BLOCK_SIZE;
bw->SectorCount = len / AAC_BLOCK_SIZE;
(intmax_t)sc->ad_size / ((1024 * 1024) / AAC_BLOCK_SIZE),
sc->ad_disk->d_sectorsize = AAC_BLOCK_SIZE;
sc->ad_disk->d_mediasize = (off_t)sc->ad_size * AAC_BLOCK_SIZE;
br->SectorCount = cm->cm_datalen/AAC_BLOCK_SIZE;
bw->SectorCount = cm->cm_datalen/AAC_BLOCK_SIZE;