disk capacity

hello I have a Yamaha 8424S and the latest patch works great for me but I have a question, I think it has already been discussed on this list but I haven't found the answer... when I quick blank the disk, the capacity reported by cdrwtool is 441MB (226240 blocks ) and it should be about 530MB (275000 blocks) is it possible to force the blocks number when quickformatting the media? I use the 2.4.18-pre3 patch from Peter Osterlund and the udf tools are version 0.9.5 -- biou