dvd-rw does not mount

sudo mount/dev/cdrw
sudo: mount/dev/cdrw: command not found
sudo mount /dev/dvdrw
mount: no medium found on /dev/sr0

Hi!
First of all, how do you know it doesn't detects the drive at boot? Ubuntu or the BIOS?
It may be a hardware problem.
So try with this command:

sudo lshw | less

And search for the drive (if you find it post some of the output).

Then in the terminal input this command:

$ sudo mount /dev/cdrom /mnt

You can also try with this devices instead of /dev/cdrom:
/dev/cdrw, /dev/dvd, /dev/dvdrw, /dev/scd0, /dev/sr0

"dmesg | less" will show the boot info, look also there if it was detected.

does it mount in other operation system on same computer?
probably dvd disk is spoild(?) or dvd drive is spoild.

And just a hint - if there's no disk (or disk is unreadable) in the DVD-drive GNOME doesn't show it as mounted. So you have to have a disk in the drive.

when i run $ sudo mount /dev/cdrom /mnt get error could not open location file ///home/henry/$%20sudo%20mount%20/dev/cdrom%20/mnt' nt such file???? also with this ones /dev/cdrw, /dev/dvd, /dev/dvdrw, /dev/scd0, /dev/sr0
next is dmesg | less do i run it in terminal ??
next is the dvd works fine i have a vista ubuntu boot and it works fine in vista
i had different dvd in drive also music the problem is is not detected a boot does not open the light in dvd is gone when try to mount it say unable to mount location no media in drive

so how i was able to see the movie after all that typing but i got this error DBus error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. also unable to maunt volume no medium found on dev/sr0 what does that mean???
thank you

but after i was able go see the cd on the drive it quit. i type this
dmesg | grep cd
[ 3.081613] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
[ 3.082445] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 3.082465] ehci_hcd 0000:00:1a.7: PCI INT C -> GSI 18 (level, low) -> IRQ 18
[ 3.082478] ehci_hcd 0000:00:1a.7: setting latency timer to 64
[ 3.082482] ehci_hcd 0000:00:1a.7: EHCI Host Controller
[ 3.082536] ehci_hcd 0000:00:1a.7: new USB bus registered, assigned bus number 1
[ 3.086451] ehci_hcd 0000:00:1a.7: debug port 1
[ 3.086458] ehci_hcd 0000:00:1a.7: cache line size of 32 is not supported
[ 3.086473] ehci_hcd 0000:00:1a.7: irq 18, io mem 0xf9fffc00
[ 3.100010] ehci_hcd 0000:00:1a.7: USB 2.0 started, EHCI 1.00
[ 3.100219] ehci_hcd 0000:00:1d.7: PCI INT A -> GSI 23 (level, low) -> IRQ 23
[ 3.100230] ehci_hcd 0000:00:1d.7: setting latency timer to 64
[ 3.100234] ehci_hcd 0000:00:1d.7: EHCI Host Controller
[ 3.100282] ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 2
[ 3.104190] ehci_hcd 0000:00:1d.7: debug port 1
[ 3.104197] ehci_hcd 0000:00:1d.7: cache line size of 32 is not supported
[ 3.104209] ehci_hcd 0000:00:1d.7: irq 23, io mem 0xf9fff800
[ 3.120010] ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00
[ 3.120202] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 3.120217] uhci_hcd: USB Universal Host Controller Interface driver
[ 3.120237] uhci_hcd 0000:00:1a.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 3.120245] uhci_hcd 0000:00:1a.0: setting latency timer to 64
[ 3.120248] uhci_hcd 0000:00:1a.0: UHCI Host Controller
[ 3.120295] uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 3
[ 3.120327] uhci_hcd 0000:00:1a.0: irq 16, io base 0x0000bc00
[ 3.120523] uhci_hcd 0000:00:1a.1: PCI INT B -> GSI 21 (level, low) -> IRQ 21
[ 3.120529] uhci_hcd 0000:00:1a.1: setting latency timer to 64
[ 3.120532] uhci_hcd 0000:00:1a.1: UHCI Host Controller
[ 3.120574] uhci_hcd 0000:00:1a.1: new USB bus registered, assigned bus number 4
[ 3.120607] uhci_hcd 0000:00:1a.1: irq 21, io base 0x0000b880
[ 3.120800] uhci_hcd 0000:00:1a.2: PCI INT D -> GSI 19 (level, low) -> IRQ 19
[ 3.120806] uhci_hcd 0000:00:1a.2: setting latency timer to 64
[ 3.120809] uhci_hcd 0000:00:1a.2: UHCI Host Controller
[ 3.120857] uhci_hcd 0000:00:1a.2: new USB bus registered, assigned bus number 5
[ 3.120891] uhci_hcd 0000:00:1a.2: irq 19, io base 0x0000b800
[ 3.121082] uhci_hcd 0000:00:1d.0: PCI INT A -> GSI 23 (level, low) -> IRQ 23
[ 3.121088] uhci_hcd 0000:00:1d.0: setting latency timer to 64
[ 3.121092] uhci_hcd 0000:00:1d.0: UHCI Host Controller
[ 3.121133] uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 6
[ 3.121158] uhci_hcd 0000:00:1d.0: irq 23, io base 0x0000b480
[ 3.121353] uhci_hcd 0000:00:1d.1: PCI INT B -> GSI 19 (level, low) -> IRQ 19
[ 3.121360] uhci_hcd 0000:00:1d.1: setting latency timer to 64
[ 3.121363] uhci_hcd 0000:00:1d.1: UHCI Host Controller
[ 3.121407] uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 7
[ 3.121432] uhci_hcd 0000:00:1d.1: irq 19, io base 0x0000b400
[ 3.121624] uhci_hcd 0000:00:1d.2: PCI INT C -> GSI 18 (level, low) -> IRQ 18
[ 3.121630] uhci_hcd 0000:00:1d.2: setting latency timer to 64
[ 3.121634] uhci_hcd 0000:00:1d.2: UHCI Host Controller
[ 3.121682] uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 8
[ 3.121707] uhci_hcd 0000:00:1d.2: irq 18, io base 0x0000b080
[ 3.640052] usb 2-5: new high speed USB device using ehci_hcd and address 2
[ 4.009142] usb 5-1: new full speed USB device using uhci_hcd and address 2
[ 4.421048] usb 5-2: new full speed USB device using uhci_hcd and address 3
[ 1998.816051] cdb 1e 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
can anyone help me what i am doing wrong?

i type dmesg | less
[ 0.000000] BIOS EBDA/lowmem at: 0009ec00/0009ec00
[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 2.6.28-13-generic (buildd@yellow) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #45-Ubuntu SMP Tue Jun 30 22:12:12 UTC 2009 (Ubuntu 2.6.28-13.45-generic)
[ 0.000000] Command line: root=UUID=455baef1-d772-423b-b15a-8fce4bb3757c ro quiet splash
[ 0.000000] KERNEL supported cpus:
[ 0.000000] Intel GenuineIntel
[ 0.000000] AMD AuthenticAMD
[ 0.000000] Centaur CentaurHauls
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: 0000000000000000 - 000000000009ec00 (usable)
[ 0.000000] BIOS-e820: 000000000009ec00 - 00000000000a0000 (reserved)
[ 0.000000] BIOS-e820: 00000000000e1000 - 0000000000100000 (reserved)
[ 0.000000] BIOS-e820: 0000000000100000 - 00000000bff80000 (usable)
[ 0.000000] BIOS-e820: 00000000bff80000 - 00000000bff8f000 (ACPI data)
[ 0.000000] BIOS-e820: 00000000bff8f000 - 00000000bffe0000 (ACPI NVS)
[ 0.000000] BIOS-e820: 00000000bffe0000 - 00000000c0000000 (reserved)
[ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
[ 0.000000] BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
[ 0.000000] BIOS-e820: 0000000100000000 - 0000000140000000 (usable)
:

It looks like Linux found it.

Let me start again.
Try this command (with the CD on the tray):

sudo mount -vo loop /dev/sr0 /mnt

Then the CD contents should appear in the /mnt directory.
Post any output that command gives you.

henry@henry-laptop:~$ sudo mount-vo loop /dev/sr0 mnt
[sudo] password for henry:
sudo: mount-vo: command not found
henry@henry-laptop:~$ sudo mount -vo loop /dev/srO mnt
mount: going to use the loop device /dev/loop0
/dev/srO: No such file or directory
/dev/srO: No such file or directory
mount: failed setting up loop device
henry@henry-laptop:~$ sudo mount-vo loop /dev/srO /mnt
sudo: mount-vo: command not found
henry@henry-laptop:~$ sudo mount-vo loop/dev/srO /mnt
sudo: mount-vo: command not found
henry@henry-laptop:~$ sudo mount -vo loop /dev/srO mnt
mount: going to use the loop device /dev/loop0
/dev/srO: No such file or directory
/dev/srO: No such file or directory
mount: failed setting up loop device
henry@henry-laptop:~$ sudo mount -vo loop /dev/sr0 mnt
mount: going to use the loop device /dev/loop0
/dev/sr0: No medium found
mount: failed setting up loop device
henry@henry-laptop:~$

i try different way but nothing.

henry@henry-laptop:~$ sudo mount /dev/sr0 /mnt
mount: /dev/sr0: unknown device
henry@henry-laptop:~$

Try this (you may have to install the lshw command with "sudo apt-get install lshw"):

sudo lshw| grep -C 10 cdrom

sudo lshw| grep -C 10 cdrom
                      logical name: /dev/sda5
                      logical name: /
                      capacity: 39GiB
                      configuration: mount.fstype=ext3 mount.options=rw,relatime,errors=remount-ro,data=ordered state=mounted
                 *-logicalvolume:1
                      description: Linux swap / Solaris partition
                      physical id: 6
                      logical name: /dev/sda6
                      capacity: 9538MiB
                      capabilities: nofs
           *-cdrom
                description: DVD-RAM writer
                physical id: 1
                bus info: scsi@1:0.0.0
                logical name: /dev/cdrom
                logical name: /dev/cdrw
                logical name: /dev/dvd
                logical name: /dev/dvdrw
                logical name: /dev/scd0
                logical name: /dev/sr0
                capabilities: audio cd-r cd-rw dvd dvd-r dvd-ram
                configuration: status=open
     *-scsi
          physical id: 1
          bus info: usb@2:3
henry@henry-laptop:~$

henry@henry-laptop:~$ sudo mount /dev/cdrom mnt
[sudo] password for henry:
mount: mount point mnt does not exist
henry@henry-laptop:~$ sudo mount /dev/dvd /mnt
mount: /dev/sr0: unknown device
henry@henry-laptop:~$ sudo mount /dev/sr0 /mnt
mount: /dev/sr0: unknown device
henry@henry-laptop:~$ sudo mount /dev/cdrw /mnt
mount: /dev/sr0: unknown device
henry@henry-laptop:~$ sudo mount /dev/dvdrw /mnt
mount: /dev/sr0: unknown device
henry@henry-laptop:~$ sudo mount /dev/scd0 /mnt
mount: /dev/sr0: unknown device
henry@henry-laptop:~$

There it says the tray is open, check that.
Also:

sudo lshw | grep -C 20 cdrom

and is it an IDE drive?

-cdrom
                description: DVD-RAM writer
                physical id: 1
                bus info: scsi@1:0.0.0
                logical name: /dev/cdrom
                logical name: /dev/cdrw
                logical name: /dev/dvd
                logical name: /dev/dvdrw
                logical name: /dev/scd0
                logical name: /dev/sr0
                capabilities: audio cd-r cd-rw dvd dvd-r dvd-ram
                configuration: status=open

able to see dvd in destop but not play now

Tell me what you did and what files are inside the DVD (try browsing it)

got it

WIN
now tell me how xP

sorry i was able to get to work but crash after i believe i have a defected dvd drive and that was my main problem.thank you for all your help.

Are you sure your drive is defective? I think I may have the same problem as you. I know for a fact that my CD/DVD drive works fine in XP Pro, and it seems to work on a fresh restart of Ubuntu, but a few minutes into using my computer, it will suddenly unmount my CD drive and give me all the same error messages when I try to manually mount it.

not it was not the drive going bad i think that ubuntu does not have this drive include into the dvd to be supported.