Hi Ian,
Thanks for your reply. Perhaps the problem with the decks is that they will not read the files if there are both SD and HD in the clip folder, they also told me that it was important that I specify which type of clip (SD or HD) I would be putting on the disk when formatting it. However, there does not seem to be an option for this in the U1 utility program.
Today they formatted a disk in one of their machines and I will return tomorrow to see if the machines can read an SD clip I have saved to this disk. The structure of their format looks exactly the same as a disk I formatted on the U1. So I will return to the Station tomorrow and report back.
Thanks again,
Jonathan.