question about building bootable cdrom?

hi all,

I'v made a linux(2.2.16) floppy bootdisk, and it
can boot properly(build with follow commands:
dd if=bzImage of=/dev/fd0 bs=1k
rdev /dev/fd0 /dev/fd0
rdev -R /dev/fd0
dd if=rootfs.tgz of=/dev/floppy bs=1k
seek=KERN_SZ

     rdev -r /dev/floppy 1440)

I want to make a bootable cdrom using following command.
dd if=/dev/fd0 of=boot.img bs=10k count=144
and I burned the cdrom on windows platform with Nero, but when I boot with it, I got follow erro message:
Loading ............................

Out of Memory
System halted

What am i wrong? Any help, a links or any other
message will be great appreciate!!

Thanks in advance!

lm0re

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