I'm stating a new thread, because there seems to be some confusion here... I have been trying to use the HP DVD+RW 100i to make a UDFS in Linux for random disk access. I was able to write to the disk last week, but now i've set up a new linux box with the same drive, and i can't write to it at all. right now, i've downloaded the 2.4.18 kernel source, and applied the 2.4.19-rc2 patch to it. I continue by applying the patch that Peter posted on the 21st, and then recompile the kernel starting with 'make oldconfig' with the .config file i have configured for my older kernel source. I get a couple of prompts as the config file is parsed: CONFIG_CDROM_PKTCDVD=m CONFIG_CDROM_PKTCDVD_BUFFERS=256 CONFIG_CDROM_PKTCDVD_WCACHE=y [...] CONFIG_UDF_FS=m CONFIG_UDF_RW=y I set all other prompts to 'No'. then, i make the new kernel, install it, and reboot. -- now, booted up with the new kernel, i assure that i am running ide-cd over ide-scsi by typing 'lsmod' : Module Size Used by Not tainted sg 25404 0 (autoclean) serial 43460 0 (autoclean) sr_mod 11984 0 (autoclean) ide-scsi 7472 0 ide-cd 27620 0 cdrom 28192 0 (autoclean) [sr_mod ide-cd] scsi_mod 79544 3 (autoclean) [sg sr_mod ide-scsi] udf 82944 0 (autoclean) rtc 6044 0 (autoclean) this seems to be ok, so i continue by checking the /dev/cdrom device: [root@ksi4 /root]# l /dev/cdrom lrwxrwxrwx 1 root root 4 Jul 19 23:19 /dev/cdrom -> scd0 this is ok too, so i continue to do a 'cdrecord -scanbus': Cdrecord 1.10 (i686-pc-linux-gnu) Copyright (C) 1995-2001 Jörg Schilling Linux sg driver version: 3.1.24 Using libscg version 'schily-0.5' scsibus0: 0,0,0 0) 'HP ' 'DVD Writer 100j ' '1.37' Removable CD-ROM 0,1,0 1) * 0,2,0 2) * 0,3,0 3) * 0,4,0 4) * 0,5,0 5) * 0,6,0 6) * 0,7,0 7) * ok. Now, i know that the UDF module is loaded, i try to create the UDF file system on the DVD by typing 'mkudffs --media-type=cdrw /dev/cdrom': [root@ksi4 /root]# mkudffs --media-type=cdrw /dev/cdrom trying to change type of multiple extents hmmm... this didn't work. Let's try without specifying the media type: [root@ksi4 /root]# mkudffs /dev/cdrom trying to change type of multiple extents nope. didn't work either. then, i try to blank the cd out by executing the dd command: [root@ksi4 /root]# dd if=/dev/zero of=/dev/cdrom bs=2048 count=2295104 dd: /dev/cdrom: Read-only file system hmm... seems like my UDF module is not supporting writing... why not? i made sure that it was set in the /usr/src/linux/.config file like i stated above. any suggestions? cheers, gustavo -- guStaSo ZaeRa | Software Engineer BRE Systems LLC. 1532 State Street Suite C Santa Barbara, Ca 93101 gzaera@bresystems.com http://www.bresystems.com "My goal is to make any information available from anywhere, at anytime."