Hey ian!! yep it worked!! your a star thanks so much for the code, I got in from work with the code and the hex editor on my memory stick, quickly installed the hex editor with no problems.
I took your advice and checked that I was selecting the right drive, I did this simply by looking at the amount of sectors that were showing in the hex editor, I used the block select function to select the chunks of data as the clipboard is limited as you said.
I pasted the first lump of code in there and went back and pasted the second block in there, I then checked that they matched each other which they did. I saved the data on to the drive and shut the machine down.
I returned the new 250GB drive to the DMR, i just layed it on the side in case I needed to do it again, I powered up the machine with a little trepidation I must say! the unit said hello, then on screen it said the hard disc was not formatted would I like to format? OK then hit format and away it went.
Bingo! then it came in 74 hours!! so it wont let you use the full 250GB (My unit is a DMR-75) it only formats 160GB but thats not a problem this must be fixed in hardware in the unit, not a problem the hard disc was just what I had laying about anyway.
So pleased it is working, I had no joy with Panasonic they refered me to the local dealer who were going to charge me a 20 quid inspection fee? before they do anything so it would have been at least 100 quid with the drive as they wouldnt fit my drive anyway.
BIG BIG Thanks for taking the time to do this, your code works!! took me about 30 mins to do it, please let me know your paypal e-mail address on e-mail and I will send you a drink for doing this, I suggest anyone else reading this may want to do the same if they also get it working.
I tried everything to get the proper disc but to no avail, this fix cost me nothing and I have got my unit back, after speaking to Panasonic they are also going to send me the new firmware on a disc, this will fix that annoying colour fade problem on channel-4.
The U80 error has also stopped, I think this was because of over the air transmissions affecting the unit, so happy days again.
So if anyone else is trying it follow this post and its pretty easy to do, just make sure that you select the right drive in the hex editor, never assume drive-1 is your c-drive! check the sectors!!