Hi and welcome to the forum.
Unfortunately for the 9150T those are the only options.
Of the 2 I would suggest the easier in the long run (less time consuming) is to remove the hard drive and connect to the PC via a cradle or adapter and copy off all the recordings using humaxrw. (from here) The recordings will be playable with VLC or similar.
It is not advised to try copying them back after a format.
A reminder that if using Windows do not allow Windows to initialise the drive.