[CentOS] creating a boot floppy

I am using the following command below to create a boot floppy file.
Am I not doing the correct thing?

mkbootdisk --device bootfloppy.img 2.6.9-34.0.1.EL
cp: writing `/tmp/mkbootdisk.Jb5537/vmlinuz': No space left on device
cp: writing `/tmp/mkbootdisk.Jb5537/initrd.img': No space left on device
cat: write error: No space left on device
cat: write error: No space left on device


Jerry