How to format external drive?

Hi,
I replaced the internal drive in my S3 with a 1TB new drive. I had an external Toshiba 1TB drive connected to this Tivo before the upgrade. I tried reconnecting it but the S3 does not see the external drive. What can I do to get it to work? I am assuming the external drive needs to be wiped clean to work with the S3??? I have checked the esata cable, tried 2 of them and the drive powers up as normal.

Thank you.