Finder does not read DVD while Terminal does

[el.pescado]

I have recently encountered a weird problem. I have received DVD+R discs that I can't read in Finder. They show up in Devices list, appear on desktop (albeit with folder icon, not DVD one). When I click on it, I can see folders on DVD (but not files), but every one is empty (statusbar tells "0 items"). I cannot copy those folders anywhere (I got error -8060).

Now the funny part.

Disc is mounted correctly:

$ mount
(...)
/dev/disk2 on /Volumes/ŚLUB DVD1 (udf, local, nodev, nosuid, read-only, noowners)

I can browse contents in Terminal using shell utilities (ls, cp) without any problems. I can copy files without any errors.

I am only confused by high used inode count:

$ df .
Filesystem 512-blocks    Used Available Capacity    iused   ifree %iused  Mounted on
/dev/disk2    6710496 6710496         0   100% 18446744073707874556 1677624 3270699303848913920%   /Volumes/ŚLUB DVD1

Is this disc broken?

 

[crjackson2134]

Just guessing, but it looks like it was written to, but the session wasn't closed.

 

[el.pescado]

Can this be verified?

And why DVD is readable by shell utils?