Hi there. I recently bought a sat nav update disc for my superb. I've been trying to install it bit with no luck. It gets to about 75% and then jumps back to the start. Would anyone have any idea what might be causing this problem. 

This usually means either problems with second DVD layer reading or too small HDD partition for maps.

 

Problems with second DVD layer reading typically occurs due to either dirty laser lens or faulty laser. If disc is non-original which means it was burned then it could also be incorrect burning or low quality disc.

 

HDD partition issue is typically caused when upgrading older units, equipped with 30GB disc, that originally had only 2 partitions (20GB for music + 10 GB for maps) with newer software that divided HDD into 3 partitions. This new software splits HDD in ratio 50-25-25 (music-maps-POI) and is dedicated for 40GB discs so then you still have 20GB for music, 10GB for maps and 10GB for POI. When you use this software on 30GB discs then partition for maps is only 7.5GB which is an issue when updating maps. I have also found the same problem on latest C14 units that are equipped with 30GD solid state disks (SSD) that are splitted 65-28-7 => still maps partition is too low for latest maps. Solution is to have 30GB disk splitted 60-35-5, it can either be done with service software (e.g. SetConfig) or by flashing unit with especially modified firmware.

 

I suggest you first let us know what is exact model number and software version of your Columbus.

 

Can you tell me where to find the information you mentioned. 

And it is not an original disc.