DVD+RW and UDF problem

Hi!

I want to use UDF filesystem on DVD+RW disk for random access:

# dvd+rw-formatdev-hdc # mount -t udf -o rw,noatimedev-hdcmnt-dvd # cp -v *mnt-dvd

File copy process starts but some time later (files are large) I get errors:

cp: writing `-mnt-dvd-superfamily.avi': No space left on device cp: cannot create regular file `-mnt-dvd-Monster Inc.avi': Input-output error cp: cannot create regular file `-mnt-dvd-Antz.avi': Input-output error cp: cannot create regular file `-mnt-dvd-VinniSlonotop.avi': Input-output error

though there is a lot of space on device:

# df -hmnt-dvd Filesystem Size Used Avail Use% Mounted on dev-ide-host0-bus1-target0-lun0-cd 4,4G 224M 4,2G 5%mnt-dvd

This is from log file:

May 13 09:03:14 ddo kernel: hdc: tray open May 13 09:03:14 ddo kernel: endrequest: I-O error, dev hdc, sector 1124 May 13 09:03:14 ddo kernel: hdc: tray open May 13 09:03:14 ddo kernel: endrequest: I-O error, dev hdc, sector 1124

Sometimes I can copy files if copy them separately and remount device after

Device and disk are good because when I use growisofs I can write and read data without any error. I've been tried async option for mount but no success. Can you help me? Additional info:

Kernel: 2.6.11 (and same problem on 2.6.14.3) Device: NEC ND-4570A with DVD+RW disk loaded UDF tools: 1.0.0b3 (from source tarball)

Thanks.

-- Dmitry Davletbaev