If I buy this...

And I want more hard drive space...

Must I buy one of these?

Or will any SATA hard disk with an E-SATA plug do?

(It just so happens I snagged a 1tb SATA drive a little bit ago... thanks to a tip here on the bbs... you might remember the thread... and I ended up not hooking it up to my file server yet. Can I just get an E-SATA connector cable for the thing and then just plug it in and it's all done?