如下:这是在2.6.7内核时的情况
[root@chensong winE]# mount /mnt/winE/FC2-i386-disc4.iso /mnt/cdrom -o loop
mount: Could not find any loop device, and, according to /proc/devices,
this kernel does not know about the loop device.
(If so, then recompile or `insmod loop.o'.)