Dual booting windows XP - can I write protect the other OS drive?

15 Feb 2004
I've recently setup my system to dual boot with a second Windows XP installation as a sandbox to try out new or untrusted software safely.

When I boot into my sandbox XP installation however, my regular XP OS is still visible to the system as the C drive.

Is there any simple way I can protect my normal XP drive (C) from changes by the second installation of XP? I fear many programs will probably blindly try to write to the C: drive even if its not the system drive (especially viruses and malware), and this will defeat the object of my "sandbox".
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