[CentOS] mount initrd

Hi,
 
I try to mount the file /boot/initrd-2.6.9-42.ELsmp  but I have a error
 
 
[root at localhost ~]# cp /boot/initrd-2.6.9-42.ELsmp.img /root/
[root at localhost ~]# mv initrd-2.6.9-42.ELsmp.img initrd-2.6.9-42.ELsmp.gz
[root at localhost ~]# gunzip initrd-2.6.9-42.ELsmp.gz
 
[root at localhost ~]# mount initrd-2.6.9-42.ELsmp  /tmp -o loop
[root at localhost ~]# mount: you must specify the filesystem type

why ?
 
Denis
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