Hi!
Could anybody help me mounting an external hdd to Ubuntu 9.04?

(Don't know if I 've done anything wrong, but there's no reply to the "fdisk -l" command)

thanks in advance

I'm assuming it's USB? Try running the command lsusb as root and seeing whether it's seen there.

Sorry, I have this information in the fdisk -l command

Disk /dev/sda: 164.6 GB, 164696555520 bytes
255 heads, 63 sectors/track, 20023 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xfcb7fcb7

Device Boot Start End Blocks Id System
/dev/sda1 1 3824 30716248+ 83 Linux
/dev/sda2 * 3825 3946 979965 83 Linux
/dev/sda3 3947 13334 75409110 83 Linux
/dev/sda4 13335 20023 53729392+ 5 Extended
/dev/sda5 13945 20023 48829567+ 83 Linux
/dev/sda6 13336 13943 4883728+ 82 Linux swap / Solaris

Partition table entries are not in disk order

Yes, it's a usb and I get this information to the lsusb command

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 046d:c408 Logitech, Inc. Marble Mouse (4-button)
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Problem solved!
thanks!