First off, you probably should not use I-Tunes anymore. The user agreement you have with them states:
Quote:
Usage Rules
(i) Your use of the Products is conditioned upon your prior acceptance of the terms of this Agreement.
(ii) You shall be authorized to use the Products only for personal, noncommercial use.
http://www.apple.com/legal/itunes/us/terms.html #10
I do not personally use a hard-drive but am strictly disc-based. But hard drives are cheap now days and there is lots of software to use. I would look for deals on e-bay and the internet companies for the discs and look for a program that will let you host and rip the karaoke. Mind you, I do not believe this is even legal but whatever you do, don't but a hard-drive loaded with songs.
As most of the hosts who do use a computer or hard drive player here, have a disc for every disc they rip.
Others can give you advise on what they use or just search the forum here as there are already posts on this matter.
To me, disc-based = no troubles.
Yes, my dics will wear out. There are ways to fix them though. I may have to replace the discs at one point. Part of doing business.
This is from a USA point of view and is only my opinion.