You really need to give more info!.
What type hard drive?
Is it a usb adapter?
What have you already done?
What do you mean it is not picking up HD?
Is it recording other channels that are not HD?
Seriously.... help us to help us to help you, we are not mind readers.
Loads of members have viewed this thread and will have usually tried to help but I expect they are as lost as me....
my hard drive is a 2.5 seagate 120gb inserted into a external caddy that requires power from usb and also a usb for the data. i have formatted it on my pc to FAT32 and it works fine on my pc but when i plug it into the box it does not pick it up/recognise it. if i plug a usb stick in, it picks it up straight away so i cannot think why it cant see the hard drive.