Is it possible to change location of secret disk from the system partition to another?
We are sorry to say no. It's impossible not because we dont want that, it's because technical limitation of Microsoft virtual storage system. The system which we use built like that, and we cannot change that. It provides many benefits, but also have some limitations. Thus, secret disk will always use free space from your system partition, and you cannot use disk D or external HDD for that purpose. Please, accept our apologies.
However, in the future release we have plans to make an option to create virtual insecure disks. They will not be protected by password, but can appear and disappear like our other secret disks, and for these disks you can use any space - disk D, E, F or external HDD - it's all up to you! We are waiting your feedback about this insecure function - do you need it?