Older enclosure issues w/newer optical drive

Hello All,
Bought an LG GH22NP21 dvd burner and it works fine as an internal in my powermac g5 1.6, but I want to make it work in my old Lacie enclosure. The enclosure is one of the old ones with a fan that housed the original superdrives (in this case dvr104) and connects by FW 400. The enclosure will run the new LG in some cases but has some behavior that makes it a no go (intermittently not being recognized by host computers, won't burn to some sorts of media). It seems that the enclosure is causing the issues.
Anyone have any ideas of how to 'update' an old enclosure like this work on a newer optical drive? I've searched for firmware updates but can't seem to even find the enclosure/product on the web, let alone an actual firmware update. Possibly it's not the firmware that's lacking? Maybe the actual chipboard? I'd love to use this enclosure.
Any light shed on what makes an enclosure compatible with a newer drive would be much appreciated! (Or conversely what makes an enclosure NOT work)
Thanks in advance.
Szucc

Jeff et al,
Sorry for the delays in posts and the resulting stop-and-go nature. Appreciate very much the thoughts and help.
Actually the G5's FW400 is indeed in question as I'm having an issue with Digital Performer that may or may not have to do with the FW card/bus. When editing and mixing (with my audio interface and the data hard drive connected by FW400) I get stopped, routinely, by the colored pinwheel. But the culprit is not yet known and I'm trying many tests; FW may not be the issue at all. But I must find the answer as I can't work with this happening and clients in here are put at disadvantage.
But, with regard to the optical drive, the issue (at least of the failed burning to dvd-r) happens when the drive is connected to 2 different computers, so it's unlikely an issue with the firewire ports/busses/cards on the computers.
So yes, it should be an issue with the old Lacie ENCLOSURE. But is it the firewire bridge? The jury may still be out because I've reinstalled the original optical drive (dvr 104) in the enclosure and the drive is recognized immediately by my G5 (whereas the LG drive inside Lacie would NEVER be recognized). So that points to an adverse interaction between the old enclosure and this newer drive.
My next step, I suppose, would be to try burning to dvd-r with the dvr104 inside the Lacie. If that fails, then, yes, it could very likely be the FW bridge. But if it succeeds then maybe it's the chipset [for lack of better term]? IE: the enclosure itself just simply cannot support this newer LG drive.
So my question is: What makes an enclosure "not support a newer or particular drive"? Is a FW enclosure NOT simply a housing with a power supply and a firewire bridge? Is it much more than that? And what specifically is under the hood that makes an enclosure "more than that"...?
Would LOVE to understand that better.
Thanks again for any thoughts.
Will try burning to dvd-r with the old/original dvr104 back in the enclosure and report back.
szucc

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