I've just purchased Lightroom 3 and wanted to get some advice from experienced LR users before I go too far down the path of setting up my catalogue and importing files.

I was planning to have both my catalogue and the images on an external 2Tb HDD, rather than on my internal HDD (with backup to a second external HDD of course). I've always kept my images on external HDDs rather than fill the internal drive of the computer and would prefer to continue that way.

I know the default LR location for the catalogue is on the C drive, but is that just for simplicity's sake, or is there a good reason to have the catalogue on the computer's drive?

TIA for any advice on this.