block device problem

Hi ......
I have file system problem when i try to mount get the following message :
mount: /dev/rdsk/c1t4d0s7 not a block device ....

I run fsck it's ok ,,,, after run
newfs -N /dev/dsk/c1t4d0s7 and
fsck -o b=535952 /dev/dsk/c1t4d0s7 .............it's ok ........
At the and when i try to mount file system i get the error......

I have no backup :-(((

Tnks in advance .............

/dev/rdsk/c1t4d0s7 is wrong. You need to use:
/dev/dsk/c1t4d0s7 when you mount.

Tnks !!! :-))) i resolved tnks to you .....................