In this article, the author writes:
"You can install Linux onto a PS3, but it is pretty hobbled. First of all, you don't get full access to the sick graphics capabilities, and secondly you can't watch DVD movies from within the Linux OS.
Well luckily I tried plugging in my XBox 360 HD-DVD Drive. Upon rebooting the PS3, the XBox 360 drive came up as the first SCSI drive /dev/scd0 and /dev/dvd was linked to it. The Blueray PS3 drive came up as /dev/scd1 and was linked to /dev/dvd-sr1.
I am now able to rip with the best of them. I compiled handbrake from source, and I am now able to RIP all my DVDs and encode them in H.264 in near real time."