>My guess is that the fact this guy ran the operation from his bedroom, and they weren't sure whether he would co-operate or not, was the reason they seized the disk rather than just subpoena him. Presumably if it was hotmail or gmail this wouldn't have happened.
Is this somehow supposed to be acceptable? "We weren't sure you would come down to the station and answer some questions, so we arrested you (without charge) and held you for a day."