[no subject]

And from the source code:
	/**
	 * Read an RDOS block.  The sector skewing for RDOS seems to be
different.
	 * This routine will convert the block number to a DOS track and
sector,
	 * handling the sector change-over.  The readSector method then
should
	 * take care of various image formats.
	 * <p>
	 * Note that sectorSkew has the full 16 sectors, even though RDOS
	 * itself is a 13 sector format.
	 */
	public byte[] readRdosBlock(int block) {
		int track =3D block / 13;
		int sector =3D sectorSkew[block % 13];
		return readSector(track, sector);
	}

AppleCommander supports 13-sec RDOS disks formatted on 16-sec disks.
Ahem...

antoine