cpm software detects 2 drives, but I only have 1

[TFM]

I wouldn't be surprised if you would make HD possible. 

[steve]

The Amiga used HD floppy drives by making it run at half speed, is this possible now with the CPC?

[TFM]

The drives we're using will run always with 300 rpm. However if you increase the speed of the FDC (f.e. in the 6 MHz CPC), then this may be sufficient to use HD formats. It may be not as easy though.