Hi, I got a new external dvd burner from LG (GSA-5163D) and want to use this device for backup purposes. Therefore I tried to use the standard blockdevice (for me it's /dev/sr0) and created a new udf filesystem on a blank dvd-ram. But the writing performance can't be called performance because writing speed is 150 kb/s. Therefore I've tried to use the pktcdvd driver to improve writing performance but I didn't get it working with my device. I did some debuging but I've reached a point where I don't know what I have to do now. What I've done so far: - "pktsetup dvdram /dev/sr0" throws an error in dmesg. - enabled debugging in include/linux/pktcdvd.h: "#define PACKET_DEBUG 2" - added some VPRINTK statements to drivers/block/pktcdvd.c to find out what doesn't work: in "static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)" rq->errors is set to 134217730 after "wait_for_completion(&wait);" has been called. Due to my VPRINTK statements and dmesg "generic_unplug_device(q);" will never be called in this function which is strange because it should be called just before "wait_for_completion(&wait);". - Here is the dmesg dump after pluging in my device and calling "pktsetup dvdram /dev/sr0": Dec 27 05:17:53 [kernel] usb 1-3: new high speed USB device using ehci_hcd and address 4 Dec 27 05:17:54 [kernel] scsi2 : SCSI emulation for USB Mass Storage devices Dec 27 05:17:54 [kernel] usb-storage: device found at 4 Dec 27 05:17:54 [kernel] usb-storage: waiting for device to settle before scanning Dec 27 05:17:59 [kernel] Vendor: HL-DT-ST Model: DVDRAM GSA-5163D Rev: A105 Dec 27 05:17:59 [kernel] sr0: scsi3-mmc drive: 23x/23x writer dvd-ram cd/rw xa/form2 cdda tray Dec 27 05:17:59 [kernel] usb-storage: device scan complete Dec 27 05:19:00 [kernel] pktcdvd: v0.2.0a 2004-07-14 Jens Axboe (axboe@suse.de) and petero2@telia.com Dec 27 05:19:12 [kernel] kcdrwd: i:0 ow:0 rw:0 ww:0 rec:0 fin:0 Dec 27 05:19:12 [kernel] pktcdvd: entering open Dec 27 05:19:12 [kernel] pktcdvd: elv_add_request: rq->errors: 0 - Last output repeated 2 times - Dec 27 05:19:12 [kernel] pktcdvd: pkt_generic_packet: rq->errors: 134217730 - necessary parts of "lspci -v": 00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01) (prog-if 00 [UHCI]) Subsystem: IBM Unknown device 052d Flags: bus master, medium devsel, latency 0, IRQ 11 I/O ports at 1800 [size=32] 00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01) (prog-if 00 [UHCI]) Subsystem: IBM Unknown device 052d Flags: bus master, medium devsel, latency 0, IRQ 11 I/O ports at 1820 [size=32] 00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01) (prog-if 00 [UHCI]) Subsystem: IBM Unknown device 052d Flags: bus master, medium devsel, latency 0, IRQ 11 I/O ports at 1840 [size=32] 00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 01) (prog-if 20 [EHCI]) Subsystem: IBM Unknown device 052e Flags: bus master, medium devsel, latency 0, IRQ 11 Memory at c0000000 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Capabilities: [58] Debug port - "lsusb -v": Bus 004 Device 001: ID 0000:0000 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 9 Hub bDeviceSubClass 0 Unused bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x0000 idProduct 0x0000 bcdDevice 2.06 iManufacturer 3 Linux 2.6.14-gentoo-r5r40 uhci_hcd iProduct 2 UHCI Host Controller iSerial 1 0000:00:1d.2 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 25 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 0mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 9 Hub bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type none wMaxPacketSize 2 bInterval 255 Language IDs: (length=4) 0409 English(US) Bus 003 Device 001: ID 0000:0000 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 9 Hub bDeviceSubClass 0 Unused bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x0000 idProduct 0x0000 bcdDevice 2.06 iManufacturer 3 Linux 2.6.14-gentoo-r5r40 uhci_hcd iProduct 2 UHCI Host Controller iSerial 1 0000:00:1d.1 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 25 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 0mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 9 Hub bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type none wMaxPacketSize 2 bInterval 255 Language IDs: (length=4) 0409 English(US) Bus 002 Device 001: ID 0000:0000 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 9 Hub bDeviceSubClass 0 Unused bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x0000 idProduct 0x0000 bcdDevice 2.06 iManufacturer 3 Linux 2.6.14-gentoo-r5r40 uhci_hcd iProduct 2 UHCI Host Controller iSerial 1 0000:00:1d.0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 25 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 0mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 9 Hub bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type none wMaxPacketSize 2 bInterval 255 Language IDs: (length=4) 0409 English(US) Bus 001 Device 003: ID 152e:e003 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x152e idProduct 0xe003 bcdDevice 0.01 iManufacturer 1 HL-DT-ST DVDRAM GSA-5163D iProduct 2 Super Multi DVD Rewriter iSerial 3 4B13E050 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 32 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 8 Mass Storage bInterfaceSubClass 6 SCSI bInterfaceProtocol 80 Bulk (Zip) iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type none wMaxPacketSize 512 bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type none wMaxPacketSize 512 bInterval 0 Language IDs: (length=4) 0409 English(US) Bus 001 Device 001: ID 0000:0000 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 9 Hub bDeviceSubClass 0 Unused bDeviceProtocol 1 Single TT bMaxPacketSize0 8 idVendor 0x0000 idProduct 0x0000 bcdDevice 2.06 iManufacturer 3 Linux 2.6.14-gentoo-r5r40 ehci_hcd iProduct 2 EHCI Host Controller iSerial 1 0000:00:1d.7 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 25 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xe0 Self Powered Remote Wakeup MaxPower 0mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 9 Hub bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type none wMaxPacketSize 2 bInterval 12 Language IDs: (length=4) 0409 English(US) Greetings Gerald