I have experimented taking the hard drive out of my system and replacing it before attempting to upgrade it with a larger drive, without any problems. However, I've tried it again and also hooked it up to my PC to look at the contents of the disc. I was careful not to try to open any of the files or to modify them in any way. Unfortunately, with the drive back in Sky+ any attempts to access one of my pre-recorded programmes result in the system freezing and I have to pull the power lead and restart. Have I inadvertently corrupted the file for this programme? Any solutions would be gratefully received. Steve.