Is it that simple ie.e 'SBT_TAPE' would do the same if the pool is disk type. I thought we need to replace SBT_TAPE with something else.

May be it seems that SBT_TAPE just directs it to the Media Management Application and POOL decides whether tape or disk.

Exactly the same. But you have to specify a pool name which is located on disk device.

Yes. It should work that way.