Sean C. Farley wrote:
On Thu, 3 May 2007, Ulrich Spoerlein wrote:
Hi all,
I'm having a hard time getting my external (USB, Firewire) Plextor
PX-755UF to read any retail DVDs at all. I can read any kind of CDs
and also DVD-Rs. But mastered DVDs are invisible to FreeBSD.
I can not even read a single sector from such a DVD with the external
drive, but it's working just fine with the internal one. It's really
driving me nuts.
<snip>
The NEC drive can read DVDs just fine (although it sucks).
% recoverdisk /dev/cd1
start size len state done
remaining % done
0 1048576 7411912704 0 0 7411912704
0.0000000^C
(130)% recoverdisk /dev/cd0
recoverdisk: DIOCGMEDIASIZE failed: No such file or directory
(1)% dd if=/dev/cd0 bs=2048
0+0 records in
0+0 records out
0 bytes transferred in 0.000093 secs (0 bytes/sec)
If I attach the device via Firewire, it's just the same. Perhaps it
requires some sort of quirk? Where should I start looking for debug
output? Which test should I run. Any help would be greatly
appreciated.
I had an issue with ripping some DVD's to my laptop before a trip I made
(note: no distribution occurred (for the lawyers :))). I wanted to
just use dd to do it, but dd would fail after a small amount of data was
read. If I first played a little of the DVD with mplayer, then dd would
work afterwards. It probably had something to do with mplayer
whispering sweet nothings to the DVD player.
Sean
Yes, there are ioctls that wind up instructing DVD players to be happy.
Once they are issued, they remain in effect until the disk is changed or
the device is reset. An argument could be made that every open of a DVD
device should perform this magic, and not rely on the app to do it. But
an argument could also be made to leave well enough alone =-)
Scott
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