They love to advertise that it holds 180 hours, but 25 hours of HD programming just isn't cutting it. Has anyone swapped in a bigger drive?

Trying to but was unable to get the new hard drive formatted in Lenox OS can anyone help in this problem? I did a direct copy, but it made the same size disk, for I want to take advantage of the 1.5 TB drive and not use 250MB drive as supplied by Bell.