it is true. There is a recipe for it.
When that will not work, is after you have installed MS Office. Or
other products that key off the drive letter details. Then, after
you use the petri.co.il suggestion, the applications that key off
the letter, will have a problem. Most "naive" (inexpensive) software
does not have a problem. But bigger packages like Office do not like
it. And since you have just installed the system anyway, there is not
likely to be anything on there (yet) that will get upset.
But if you did it six months from now, after reinstalling all apps,
it might be a different story.
The same can apply, to the drive letter assigned to the optical drive.
it is best, to change that right after the install, and then leave
it set that way for good. Again, some tools "look" for their original
installer CD, on a particular drive letter. Yes, it can probably
be fixed, one application at a time, in the registry.
Another thing that has a drive letter setting, is System File Checker.
But the odds of that working seamlessly, without screwing with it,
are so low, it hardly counts as an issue. The last time I tested it, I
had to set two registry entries to get it to work.