what does "cramfs" mean?

[Tao Liu <tao_debian@yahoo.com>]

Hi,
I use kernel 2.4.7 , when I turn on my computer, I can see
...
VFS: Mounted root (cramfs filesystem)
Waiting for 5 seconds, press Enter to obtain a shell

if I press Enter, it says
9: Terminated
sh: can't access tty; job control turned off

# exit

cramfs: wrong magic
Kernel panic: VFS: Unable to mount rootfs on 03:02

if I do not press Enter, it says
...
cramfs: wrong magic
VFS: Mounted root (ext2 filesystem) readonly
change_root: old root has d_count = 2

What does the information mean?


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