@Mick
Don't tell me you are using the same IDE cable all the time? Perhaps it is some problem with that cable. Maybe the hard drive is making clicks trying to reread the drive because:
- power problem
- software error as pointed out by thomas. In which case format should fix it up
- bad cable
- OS3.5 drivers are stuffing up the writing on your drive (after reboot it would load in the ROM Update). In which case a format using OS3.1 should fix it up.
You should try the drives in a non-amiga computer (with a different cable) to see how they fare, and whether you can format them there after they are having problems.
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