running a dell e6410, have ordered a caddy for 2nd HD and 240gb SSD that will be running OS. Question.. should i replace existing HDD with SSD and install existing HDD in optical drive, at the off chance i may need to use CD drive in future, or keep as is and add SSD to optical caddy? is there any an advantages to either option? already have windows ISO file on flash drive for initial boot/install and will run a clean new windows install either way. 2nd HDD will be solely for storage. thanks