math,
thank you for replying.

1) But if you plan to make multisession on a BD-R, the burn engine will use UDF 2.60 (required by the specification), and then you disc will be unreadable on most Linux (and Windows) systems.
Hm, I wonder for which systems UDF 2.6 are readable, now or later

2) I haven't bought the LaCie d2 yet, it is currently of most interest as portable, external device. But I had overseen it had only 2x BD-R(E) writing speed.
The new Sony BWU200S, though internal and non-portable has doubled the BD writing speed to 4x
http://www.sonystyle.com/webapp/wcs/...52921665251949

Regarding Firewire, I hadn't used it practically on Linux before the last weekend. Then I connected a Datavideo DN-300 native DV&HDV HDD recorder with a FAT32 file system. This Firewire device popped up automatically on my openSUSE 10.3 desktop as a portable disk (just like an USB), and it worked quite well for copy&paste files both ways to and from the internal Linux hard disk file systems
http://www.datavideo.info/en/products/dn300.shtm