user11601: I'm currently running a rig with seven block erupters in a 10 connector powered USB hub. After taking the USB fan into account, I have an additional two USB ports available. The host is an old laptop.
I've just purchased a Butterfly Labs 30 Ghash/s unit. What is the best way to combine this into my rig?
Can I plug it into the USB port, even though the Butterfly Labs 30 Ghash/s unit is self-powered? Otherwise, should I connect the Butterfly Lab unit directly to a USB port on the laptop? Will there be any difference?
I'm mining with CGMiner.

user4819: I don't think it will make a difference.  If you are using the Anker 10-port "power bar" style USB hub (that's what it sounds like you have, based on your description of it + the fact that this hub is very commonly used with USB bitcoin miners), that is a pretty robust hub.  One of my mining rigs (which doubles as my media center) has 8 block erupters + USB fan + an external USB hard drive on it, and all devices function without any difficulty.

11601: <p>I'm currently running a rig with seven block erupters in a 10 connector powered USB hub. After taking the USB fan into account, I have an additional two USB ports available. The host is an old laptop.</p>

<p>I've just purchased a <a href="https://products.butterflylabs.com/" rel="nofollow">Butterfly Labs</a> 30&nbsp;Ghash/s unit. What is the best way to combine this into my rig?</p>

<p>Can I plug it into the USB port, even though the Butterfly Labs 30&nbsp;Ghash/s unit is self-powered? Otherwise, should I connect the Butterfly Lab unit directly to a USB port on the laptop? Will there be any difference?</p>

<p>I'm mining with <a href="https://en.bitcoin.it/wiki/CGMiner" rel="nofollow">CGMiner</a>.</p>
 4819: <p>I don't think it will make a difference.  If you are using the <a href="http://rads.stackoverflow.com/amzn/click/B005NGQWL2" rel="nofollow">Anker 10-port "power bar" style USB hub</a> (that's what it sounds like you have, based on your description of it + the fact that this hub is very commonly used with USB bitcoin miners), that is a pretty robust hub.  One of my mining rigs (which doubles as my media center) has 8 block erupters + USB fan + an external USB hard drive on it, and all devices function without any difficulty.</p>
