was actually thinking about doing it this way, but wasnt 100% sure yet.
my current thinking is this
1. disconnect my main hd
2. install new os on spare hd
3. test a bit
4 instal another new os on spare hd
5 test a bit
6 decide which flavor i like
i was thinking of putting up to 4 diff distros on the spare hd for testing, shile not touching the main hd
That will pretty much do the setup of the 2nd option, where you use the motherboard boot menu to select the drive to boot from.
But you could also do a combination of them. If you are only testing, you should not need alot of room on the drive so you could partition that 2nd spare drive.
Disconnect the main drive.
connect the 2nd spare drive
install distro 1. partition the drive into 2/3/4 or what ever
install distro 2, on other partition. will give you the option to dual boot
repeat if you want to do all 4
hookup main drive again
when booting, you can use the motherboard boot menu to select main(and have it set as default) to boot to main when not testing.
or
motherboard boot menu to select 2nd drive, and it will give boot menu for the 2 distros and you can select which one to boot
Another way to test is you can use a USB flash drive to run a LiveUSB version as well. I just made one for Ubuntu(for new hdd burnin) and set it to use 1gb of the flash drive for persistence data.
but should have a 4-8gb usb drive