... if anyone's bothered or has been having the same problem.
My problem was that the Fortec's don't recognise any hard drive larger than 500GB. I purchased 1TB on the advice of the shop assistant in Maplin's and was told to get the latest update so that they could be recognised. Thanks to this site I find out that 500GB was the biggest.
You will need a p.c. to do this and a little knowledge; yet if I can do it then anyone can

.
I got some free partitioning software off the web and made a ( and please forgive me if I get it wrong here ) a 512Giga Bit or Byte partition formatted with FAT32. I know that there's a difference between a Bit and a Byte but I'm not sure what. I do know that 512 of one gives you just shy of 500 of the other.
Imediately both the Innovations and the FS4400 recognised them. Hoorar!

Not quite!

Modern hard drives come preinstalled with the sleep function enabled. This kept making the Fortec's restart and losing their programs. After trawling the Seagate website ( They don't make it easy either ) I found 'Segate Manager'. That's the program that can turn the sleep function off and so long as the Fortec's are on so is the drive and so no interuptions as the drive 'wakes up'.
Took me a while but I got there.
The Innovations work fine with this and give you the full 500GB of space that you partitioned. The FS4400 for some reason will allow you to turn off the 'Timeshift' function but still amazingly allocates around 20% of the drive space over to it....use it or not!
Also, of course I have a 1TB drive and can only use half it. May be Fortec will get their act together at some point though. I've tried to contact them but they're not interested. Questionable customer service me thinks.
Anyway, anyone else with the same problem let me know via a personal email and i'll get back to you with my findings as soon as, but please give me time as there are days when I don't get to the web