Are DVD or/and BD writers stable via USB?

I'm just guessing here, but I wouldn't be concerned about DVD use. Even at 24X you're still running at well under half of the raw throughput of USB.

But USB seems to max out at a transfer rate of something close to 30MB/sec (even though the theoretical raw rate goes up to 60MB/sec). That means you're going to max out the connection bandwidth at a BD disc speed of around 6X. For a safety margin I'd think that means you'd want to avoid a USB BD burner rated at anything faster than around 4X.

Performance and stability will depend on the PATA/SATA(whichever the LGBE06LU10 is using) to USB2.0 converter controller chip, hidden inside the enclosure connected to the optical drive's interface.

Alternatively if you want a more integrated solution then you could take the drive out of its USB enclosure and connect it directly to PATA/SATA.
I bought an Optiarc BC-5600S (SATA) recently off eBay cheap and plan to mod it into a small mini-ITX enclosure. It's a standard (12.7mm) slim optical drive that slot loads. It'll be much better, cheaper,and more flexible than crappy Mac Mini.

I just talked to LG and I should have no problem running their BD writer with the Atom processor. So I want to go for it.

Thanks for your inputs...