Can't mount POP T2T image

[Nighttotal2]

When I create my own Prince of Persia The Two Thrones image by alcohol 120 and I want to mount it by DT it won't start and it writes that image is invalid or something like that. Why?

[AnalCobra]

Did you unplug your drives? How did you cerate your image (file format/settings)? Please post the whole error message.

[Nighttotal2]

Did you unplug your drives? How did you cerate your image (file format/settings)? Please post the whole error message.

I haven't unpluged my drives... It should mount that image with drives pluged, no? Image was created in Alcohol 120% from not original cd of POP T2T. I have tried it with DPM options on and off and format mds/mdf... It writes: Unable to mount image. Invalid image file.