Error : mount: No buffer space available

When I am trying to mount the linux /home partition from my slave hard disk to the primary hard disk on the path /mnt/hd by issuing the following command
mount -t auto /dev/hdb4 /mnt/hd
as root
i am getting the following error message
mount : No Buffer space available
Here /dev/hdb4 stands for my /home partition which i have ckecked from my /etc/fstab

This is strange, are you sure the partition is dev/hdb4 , post the output of fdisk -l .


Regards.

I don't understand. This partition is already mounted at /home
and you also want to mount it somewhere else? I didn't know you
could do that.