 The current practical maximum speed for Blu-ray Discs is about 12× (54 MB/s).Higher speeds of rotation (5,000+ rpm) cause too much wobble for the discs to be written properly, as with the 24× (33.2 MB/s) and 52× (7.8 MB/s, 10,400 rpm) maximum speeds, respectively, of standard DVDs and CDs.Since September 2007, BD-RE is also available in the smaller 8 cm Mini Blu-ray Disc size.