I took a look at the log in the terminal again after I ran your script. There are two things are curious:

-I get a 'sh: clear: command not found' twice.. the original clear command is definitely in there..

And then there is :

Enter 'help' for information
fdisk: 1> Partition 2 marked active
fdisk:*1> Writing current MBR to disk.
Device could not be accessed exclusively

The last line in particular doesn't seem right..

Those are the only clues I can find right now..