Questions about mkisofs

[Dragoncrest]

         Hi all.  Just curious of something.  I'm probably doing something 
wrong and totally not paying attention, but for some reason when I run 
mkisofs, all my files get truncated at 12 charecters and some weird 001 is 
appended to the rest of the name.  I use the following command when 
building an iso file for burning:  mkisofs -R -U -o mycd.iso 
/path.to.files/to.be.burned/

         I'm obviously missing something because I've gotten files with 
names up to 128 charecters long to be included in an iso when burning them 
in windows, but not in freebsd using mkisofs.  I've also been able to make 
the disk name 16 charecters long in windows but only 12 with mkisofs.  Can 
someone tell me what I'm doing wrong with the options on mkisofs and help 
me fix it?  Like I said, I've read the man file and I thought I had it all 
correct, but apparently that's not true.  Much apreciated on the help.  Thanks.