diff -c --recursive linux-2.6.4_packet/drivers/block/Kconfig linux-2.6.4_dvd-rw/drivers/block/Kconfig
*** linux-2.6.4_packet/drivers/block/Kconfig	Mon Mar 22 14:44:56 2004
--- linux-2.6.4_dvd-rw/drivers/block/Kconfig	Mon Mar 22 15:03:56 2004
***************
*** 345,351 ****
  	  compliant ATAPI or SCSI drive, which is just about any newer CD
  	  writer.
  
! 	  Currently only writing to CD-RW discs is possible.
  
  	  To compile this driver as a module, choose M here: the
  	  module will be called pktcdvd.
--- 345,353 ----
  	  compliant ATAPI or SCSI drive, which is just about any newer CD
  	  writer.
  
! 	  Currently only writing to CD-RW, DVD-RW and DVD+RW discs is possible.
! 
! 	  DVD-RW disks must be in restricted overwrite mode.
  
  	  To compile this driver as a module, choose M here: the
  	  module will be called pktcdvd.
diff -c --recursive linux-2.6.4_packet/drivers/block/pktcdvd.c linux-2.6.4_dvd-rw/drivers/block/pktcdvd.c
*** linux-2.6.4_packet/drivers/block/pktcdvd.c	Mon Mar 22 14:44:56 2004
--- linux-2.6.4_dvd-rw/drivers/block/pktcdvd.c	Mon Mar 22 15:21:43 2004
***************
*** 1346,1351 ****
--- 1346,1357 ----
  	char buffer[128];
  	int ret, size;
  
+ 	/* doesn't apply to DVD+RW (?) */
+ 	if (pd->mmc3_profile == 0x1a)
+ 		return 0;
+ /*	if (pd->mmc3_profile == 0x13) */
+ /*		return 0; */
+ 
  	memset(buffer, 0, sizeof(buffer));
  	init_cdrom_command(&cgc, buffer, sizeof(*wp), CGC_DATA_READ);
  	cgc.sense = &sense;
***************
*** 1451,1456 ****
--- 1457,1475 ----
   */
  static int pkt_good_disc(struct pktcdvd_device *pd, disc_information *di)
  {
+ 	switch (pd->mmc3_profile) {
+ 		case 0x0a: /* CD-RW */
+ 		case 0xffff: /* MMC3 not supported ? */
+ 			break;
+ 		case 0x1a: /* DVD+RW */
+ 			return 0;
+ 		case 0x13: /* DVD-RW Experimental */
+ 			return 0;
+ 		default:
+ 			printk("pktcdvd: Wrong disc profile (%x)\n", pd->mmc3_profile);
+ 			return 1;
+ 	}
+ 
  	/*
  	 * for disc type 0xff we should probably reserve a new track.
  	 * but i'm not sure, should we leave this to user apps? probably.
***************
*** 1480,1489 ****
--- 1499,1516 ----
  
  static int pkt_probe_settings(struct pktcdvd_device *pd)
  {
+ 	struct cdrom_generic_command cgc;
+ 	unsigned char buf[12];
  	disc_information di;
  	track_information ti;
  	int ret, track;
  
+ 	init_cdrom_command(&cgc, buf, 8, CGC_DATA_READ);
+ 	cgc.cmd[0] = GPCMD_GET_CONFIGURATION;
+ 	cgc.cmd[8] = 8;
+ 	ret = pkt_generic_packet(pd, &cgc);
+ 	pd->mmc3_profile = ret ? 0xffff : buf[6] << 8 | buf[7];
+ 
  	memset(&di, 0, sizeof(disc_information));
  	memset(&ti, 0, sizeof(track_information));
  
***************
*** 1818,1831 ****
  
  	if ((ret = pkt_get_max_speed(pd, &write_speed)))
  		write_speed = 16;
! 	if ((ret = pkt_media_speed(pd, &media_write_speed)))
! 		media_write_speed = 16;
! 	write_speed = min_t(unsigned, write_speed, media_write_speed);
! 	read_speed = (write_speed * 3) / 2;
  
  	if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
  		DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name);
  		return -EIO;
  	}
  	DPRINTK("pktcdvd: speed (R/W) %u/%u\n", read_speed, write_speed);
  	pd->write_speed = write_speed;
--- 1845,1868 ----
  
  	if ((ret = pkt_get_max_speed(pd, &write_speed)))
  		write_speed = 16;
! 	switch (pd->mmc3_profile) {
! 		case 0x13: /* DVD-RW Experimental */
! 		case 0x1a: /* DVD+RW */
! 			read_speed = write_speed;
! 			break;
! 		default:
! 			if ((ret = pkt_media_speed(pd, &media_write_speed)))
! 				media_write_speed = 16;
! 			write_speed = min_t(unsigned, write_speed, media_write_speed);
! 			read_speed = (write_speed * 3) / 2;
! 			break;
! 	}
  
  	if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
  		DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name);
+ 		/*
  		return -EIO;
+ 		*/
  	}
  	DPRINTK("pktcdvd: speed (R/W) %u/%u\n", read_speed, write_speed);
  	pd->write_speed = write_speed;
diff -c --recursive linux-2.6.4_packet/drivers/scsi/sr_vendor.c linux-2.6.4_dvd-rw/drivers/scsi/sr_vendor.c
*** linux-2.6.4_packet/drivers/scsi/sr_vendor.c	Mon Mar 22 14:51:24 2004
--- linux-2.6.4_dvd-rw/drivers/scsi/sr_vendor.c	Mon Mar 22 15:03:56 2004
***************
*** 117,122 ****
--- 117,125 ----
  			    cd->needs_sector_size = 0;
  			}
  			/* no break; */
+ 		    case 0x13: /* DVD-RW Restricted Overwrite */
+ 			cd->device->writeable = 1;
+ 			break;
  		    default:
  			cd->cdi.mask |= CDC_DVD_RAM;
  			cd->device->writeable = 0;
diff -c --recursive linux-2.6.4_packet/include/linux/pktcdvd.h linux-2.6.4_dvd-rw/include/linux/pktcdvd.h
*** linux-2.6.4_packet/include/linux/pktcdvd.h	Mon Mar 22 14:44:56 2004
--- linux-2.6.4_dvd-rw/include/linux/pktcdvd.h	Mon Mar 22 15:03:56 2004
***************
*** 244,249 ****
--- 244,250 ----
  	__u8			mode_offset;	/* 0 / 8 */
  	__u8			type;
  	unsigned long		flags;
+ 	__u16				mmc3_profile;
  	__u8			disc_status;
  	__u8			track_status;	/* last one */
  	__u32			nwa;		/* next writable address */