New internal hard drive with its own Ubuntu operating system

[joe.ess]

I have an existing internal hard drive with an Ubuntu operating system. I am about to install another, new internal hard drive with its own Ubuntu operating system. With my new internal hard drive to house the second Ubuntu installation and with each drive having its own bootloader, BIOS will determine which one of the two gets to run. (I know it seems a bit cumbersome).

I’m not sure I want a master-slave relationship between the two drives. It would be a bonus to be able to mount & unmount the other drive in the opposite operating system to transfer documents.

QUESTION: Don’t I want to set the internal hard drive jumper settings such that each drive is a stand-alone drive, idea being that it would hopefully let the BIOS make the decision as to which to load?
I believe the hard drive jumper settings choices are: "Master or single drive" OR "Drive is slave".

Any direction would be greatly appreciated.