Hi,
I also added a 500 gByte external drive to my Explorer 8300 HD.
While I don't recall how long the disk format took as I did it about a year ago, I do know it wasn't a ridiculously long amount of time. Probably WAY less than a half hour.
Try shutting down and removing power from your cable box, shutting down the external drive, restarting the external drive then reapplying power to the cable box. See if that helps.
Good luck.
LH
Hope this helps.
I also added a 500 gByte external drive to my Explorer 8300 HD.
While I don't recall how long the disk format took as I did it about a year ago, I do know it wasn't a ridiculously long amount of time. Probably WAY less than a half hour.
Try shutting down and removing power from your cable box, shutting down the external drive, restarting the external drive then reapplying power to the cable box. See if that helps.
Good luck.
LH
Hope this helps.