Originally Posted by
dunketh
It also gives you a better 'failsafe' as C: is far more likely to be corrupted or suffer hardware failures than D: due to the frequency of use.
It doesn't make any difference based on amount of usage - it's still on the same drive!
If the HDD dies, BOTH partitions will die with it!
If you want a proper failsafe, get two HDDs. One as drive C and another HDD as drive D. And a decent backup software.