that's what i was gonna say.... let us know how it works out.
I'd also recommend doing a long test to see how long it stays stable. I get occasional dropped frames during capture, and I have to recapture that segment. And my computers pretty dam fast (although I am working with 1080i). I believe there is a setting so that it will keep capturing through dropped frames. You may have to check that for it to be reliable. Either way I would make sure you have a backup rolling, especially if it's important or live. We just had a pretty bad mess up at work because the main deck that was feeding everything else (a webfeed, the backup recorder, the live cable feed) shut off at 29:44 . It was a combination of messy wire configuration (pass-through instead of split), user error, and the failure to load the actual cameras with a tape (or at least having a VTR directly linked to each camera). Having the final product was more important than having the live feed but we ended up with neither.
Anyway...back to you.... have you considered a firestore drive? Hell of a lot more convenient and portable than what your doing.