Using SUSE 10.1

Have storage connected to server that has snapshot capabilities.
In addition, it permits alterations (writes) to the the snapshot that do not affect the volume it was snapshoted from.

I want to mount the snapshot, but as LVM was used to create a VG on the main volume, the snapshot carries the same VG UUID and PV UUID. I want to edit the metadata on the snapshot volume and modify the UUID so LVM doesn't think that the snapshot is a duplicate.
I have used dd to read in the first 256 blocks and then used vi to edit some of characters of the UUID fields (this info is in clear ASCII but I used the %!xxd option to display in hex/ascii format). I then wrote the modified file back to the storage (/dev/sda) using dd.

Reading notes on the metadata format, I confirmed it is writtten twice to the disk(storage) at 1200x and 1600x.

Question - is it "wrapped" with a CRC or other check characters??

thanks
Mike