How do you record from an LX2 using a portable hdd.

Hi
I just got a new LX2 and set it up with no problems, that is until I plugged in my portable HDD and tried a test recording.
It said there was an error possibly drive was full or not mounted. I had formatted the drive using my PC.
Can anyone tell me where I'm going wrong here as I thought it was just a case of plugging in a formatted drive and it would record.
TIA
Ian.
PS I used Win 7 PC to format hdd.

Hi Stevejo
Thanks for the quick reply,could point me in the right direction as to doing that. The manual gives nothing about it.
TIA
Ian.

Hi Stevejo
Talk about not seeing the wood for the trees!!!
Got it now, working great,