Hi, thanks for posting.
There is no true default path for RDI storage in NCrunch.
When setting up RDI, you need to specify a path. The UI is designed around this because it's important you know where the storage path is, and that you make sure to set sensible allowances for its size.
Most probably, if you click to add a new storage path, it starts at C:\RDIStorage, but there is no obligation for you to accept that.