How to connect my FIREWIRE Lacie Porsche external HD to TC which has USB?

but can I connect it to my TC?

No.

Is there a cable to do the trick

No.

(40648)

You can get a new external HDD enclosure with a USB port and swap the HDD. It's under $30.

Here's one example:

http://www.xpcgear.com/hddcaseinstall.html

How difficult it is depends on how comfortable you are with opening up computers in general. I would recommend you ask a friend experienced in computer hardware to come by and physically check out the current drive and its specifications. It's not that hard to install once you have the enclosure, but it is important that you get the right enclosure. The enclosure you need is dependent on the HDD currently inside the FW enclosure. Perhaps a visit to a local computer hardware store along with your current FW drive is advisable as well. Most new enclosures will also come with an installation guide.

Why wouldn't something like the Belkin Firewire/USB hub work?

Worth a shot. Have you tried it?