Solaris 10 Sparc - backup drive how to read it?

UNIX Solaris
1

Disk is: c0t1d0

partition> print
Current partition table (original):
Total disk cylinders available: 38307 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders         Size            Blocks
  0 unassigned    wm       0 - 38306       74.53GB    (38307/0/0) 156292560
  1 unassigned    wm       0                0         (0/0/0)             0
  2     backup    wu       0 - 38306       74.53GB    (38307/0/0) 156292560
  3 unassigned    wm       0                0         (0/0/0)             0
  4 unassigned    wm       0                0         (0/0/0)             0
  5 unassigned    wm       0                0         (0/0/0)             0
  6 unassigned    wm       0                0         (0/0/0)             0
  7 unassigned    wm       0                0         (0/0/0)             0

bash-3.2# mount /dev/dsk/c0t1d0s0 /mnt
mount: I/O error
mount: Cannot mount /dev/dsk/c0t1d0s0
bash-3.2# fsck /dev/rdsk/c0t1d0s0
Can't open /dev/rdsk/c0t1d0s0: I/O error

How to mount it? :wall:
Read labels backup?!

2

What says

fstyp /dev/rdsk/c0t1d0s0

?

3 
bash-3.2# fstyp /dev/rdsk/c0t1d0s0 
hsfs fstyp: cannot open </dev/rdsk/c0t1d0s0>
/dev/rdsk/c0t1d0s0: I/O error
udfs fstyp: cannot open </dev/rdsk/c0t1d0s0> errorno <5>
/dev/rdsk/c0t1d0s0: I/O error
open64: I/O error
Unknown_fstyp (no matches)
4

Your disk looks broken. What says:

dd if=/dev/dsk/c0t1d0s0 of=/dev/null bs=1024k

?