ext2 on a CD-RW

I thought some people here might find this amusing. After I quick-formatted a CD-RW with cdrwtool today I then did the following: mke2fs -b 2048 /dev/pktcdvd0 It appears to work OK and I'm compiling a kernel on it as I type this. pktcdvd can't handle this properly unless the '-b 2048' is given for a pretty obvious reason. df tells me that the capacity of a disc formatted like this is 530MB so there is a few MB lost compared to UDF. I'm pretty sure this is a follish thing to do so would anyone care to give me some technical reasons why? :) --John