The Tivo is a series 3 with a few recorded programs on it. The drive was functioning without any indication of a problem. I just wanted to expand the drive to a two Terabyte NAS drive. How would I know if it was failing without any symtoms? The msfcopy ended with the "segmentation" statement, after the screen scrolling for about 3 to five minutes of Input/output error message. Thanks for the interest and the help.