Followed the video tutorial from here

I had a problem getting it to recognize the drive at first using the sata cable from my dvd drive but got it working with the hard drive sata cable.
Probelm is it was reading bank 0 for a minute or so when i had a power cut.
Thought ok,try again, same serial number etc and when it gives instructions and press any key to continue i hit enter.
Then it says directory already exists (twice,one under the other) and aborts operation

So i tried doing it with a different serial number and it gets as far as reading bank 2 and aborts saying it isnt 256kb
Same if i try using 1.5def
Any help?
Thanks