I bought the acer Timeline 4810T and not work the CD/DVD recorder.

Recognized but when you insert a cd or dvd says there is no medium.
This is the dmesg output

[ 20.210145] sd 1:0:0:0: [sda] Attached SCSI disk
[ 20.210190] sd 1:0:0:0: Attached scsi generic sg0 type 0
[ 20.212379] scsi 4:0:0:0: CD-ROM TSSTcorp CDDVDW TS-U633A AC01 PQ: 0 ANSI: 5
[ 20.217927] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
[ 20.217931] Uniform CD-ROM driver Revision: 3.20
[ 20.218017] sr 4:0:0:0: Attached scsi CD-ROM sr0
[ 20.218057] sr 4:0:0:0: Attached scsi generic sg1 type 5
[ 20.218702] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 20.218721] ehci_hcd 0000:00:1a.7: PCI INT D -> GSI 19 (level, low) -> IRQ 19
[ 20.218736] ehci_hcd 0000:00:1a.7: setting latency timer to 64
[ 20.218740] ehci_hcd 0000:00:1a.7: EHCI Host Controller
[ 20.218801] ehci_hcd 0000:00:1a.7: new USB bus registered, assigned bus number 1


and this when trying to mount it manually

me@me-laptop:~$ sudo mount -t iso9660 /dev/sr0 /media/cdrom0
[sudo] password for me:
montar: no se encontro medio en /dev/sr0
me@me-laptop:~$ sudo mount -t iso9660 /dev/scd0 /media/cdrom0
montar: no se encontro medio en /dev/sr0 [no medium found]