This PC is definately not new.
Ah, yes i can see the specs now :-) ..
I'm running KUbuntu as it's main OS.
In that case you can skip the test of turning off your internal drive for test-booting. That workaround concerns windows PC's (or more specifically fat32/ntfs formatted drives)
would have burned it to a pen drive, but I didn't want to boot with a VM, wanted to boot native and install, unless I am not understanding.
The part that is not understood (as far as it applies, since i'm assuming your new to AROS. And you haven't read/understood the Icaros Desktop manual ;-p ) is that a pendrive can be installed by choosing one of two separate installation methods (you choose the one you prefer):
1) Icaros has a specific pendrive install script, that creates a small environment that allows you to install Icaros to another device (in our case that would be the internal HD)
2) Icaros can be installed (completely) on the pendrive itself. The pendrive would act as your HD.
background information:
AROS can not be booted by all those common .iso boot utilities such as rufus and many others because AROS does its work on its 'native' filesystem, which the install script will automatically setup for you.
That effectively means that there is no difference between running (ic)AROS from a pendrive or from HD, except for the speed difference. Although possible, i would be surprised if pendrive is slower than your CD/DVD drive. Also a pendrive (in my experience) causes less issues (see below).
Additional bonus (as is my experience) is that you can take that pendrive with you (assuming covid is not keeping you captive), run over to your local computer store and annoy the store keeper with running AROS on every machine that it is capable of running it ;-)
In order to be able to install the way as described you would (currently) need to use the VM as an intermediate step.
Furthermore:
option 2 as mentioned above still allows you to install icaros onto a (internal) HD (or any other device for that matter) but has the benefit of
a) you are able to testdrive it from that pendrive. For example to test if all present HW is supported, or perhaps can offer the conclusion that AROS is not for you after all, or coud convinced you (even more) to install it to a dedicated machine.
b1) you don't have to deal with empty cd/dvd's
b2) burning those (at slow 1x speed, because that is mostly an issue during boot-process)
b3) to prevent you from concluding that your cd/DVD drive stops spinning at exactly the wrong time because AROS sometimes (under certain conditions) has issues with keeping the cd/dvd-drive alive, resulting in failure to boot.
Good luck !
Ron.
PS: The manual is but a mere one click in my sig away ;-p