Plextor PX-504A can't write 2nd session

[Krisz <list@fjokk.hu>]

Hi,

I have a DVD+RW drive on a USB to IDE device...

os: Fedora Core 1
kernel: 2.4.22-1.2115.nptl
dvd+rw-tools: 5.13.4.7.4
mkisofs: 2.01a17
DVD+RW Drive: Plextor PX-504A
Media: Ricoh, TDK DVD+RW

Writing 1st session: there is no problem
[...]$ growisofs -Z /dev/scd1 -R -J ./01
Executing 'mkisofs -R -J ./01 | builtin_dd of=/dev/scd1 obs=32k seek=0'
Total translation table size: 0
Total rockridge attributes bytes: 4228
Total directory bytes: 12288
Path table size(bytes): 84
Max brk space used 21000
26526 extents written (51Mb)
/dev/scd1: flushing cache
/dev/scd1: stopping de-icing
/dev/scd1: writing lead-out
/dev/scd1: reloading tray
[...]$

Smaller problem: if I try to mount the disk in the writer I get these 
messages:
[...]# mount /dev/scd1 /mnt/cdrom1
mount: block device /dev/scd1 is write-protected, mounting read-only
mount: you must specify the filesystem type
[...]#

[...]# mount -t iso9660 /dev/scd1 /mnt/cdrom1
mount: block device /dev/scd1 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/scd1,
	or too many mounted file systems
[...]#

If I mount the disk in a DVD reader everything is OK and the files are 
readable.

Querying the media:
[...]$ dvd+rw-mediainfo /dev/scd1
INQUIRY:                [PLEXTOR ][DVDR   PX-504A  ][1.01]
GET [CURRENT] CONFIGURATION:
 Mounted Media:         1Ah, DVD+RW
READ DVD STRUCTURE[#0h]:
 Media Book Type:       92h, DVD+RW book [revision 2]
 Legacy lead-out at:    2295104*2KB=4700372992
READ DISC INFORMATION:
 Disc status:           complete
 Number of Sessions:    1
 State of Last Session: complete
 Number of Tracks:      1
 BG Format Status:      suspended
READ TRACK INFORMATION[#1]:
 Track State:           complete
 Track Start Address:   0*2KB
 Free Blocks:           0*2KB
 Track Size:            2295104*2KB
FABRICATED TOC:
- [unable to READ TOC (FFFFFFFF)]

The main problem: Trying to write the 2nd session:
[...]$ growisofs -M /dev/scd1 -R -J ./02
:-( /dev/scd1 doesn't look like isofs...
[...]$
(I wasn't surprised after I saw the output of dvd+rw=mediainfo...)


Could somebody help me?
Thank You
Regards
Krisz