now it's installed correctly you don't need to disconnect the windows drive at any time to boot into ubuntu.
what you need to do is find the correct F key to tap and keep tapping when you start your pc until it offers you a menu on what devices you want to boot first then you just select the correct hard drive from the choices it offers with the ubuntu os installed on to boot it.
yes go into bios and change the boot order of the drives save the settings and exit, now every time it starts up, without you doing anything, if you've done it correctly it will boot into ubuntu.
to add windows to ubuntus boot menu it should just be a case of opening a terminal and running the command
this should look for and find all bootable operating systems and add them to the start menu, now reboot and you should see an option to boot into windows along with the other ubuntu boot options that were already listed.
yes you can add as many operating systems as you like to your new hard drive, i would always disconnect the windows drive first tho unless you know what your doing just so you never break/overwrite it's mbr or operating system, restore partition.
Edited by terry1966, 04 March 2014 - 01:33 PM.