Allow indexing service on Win XP?

I just bought a 3TB Passport Ultra to use for the Carbonite mirror image backup on my Win XP workstation. I connected it and did a quick format and told Carbonite to use it, which it is doing now. When I opened the properties dialog, I noticed that the option to allow the indexing service was checked. Since I will never do any searches on this disk, I don’t think I need this service enabled and I understand that it can slow disk access.

Should I turn this option off or leave it on?

Thanks

turn it off if your never do any searches on the disk

Thanks