This information is good if you have windows 8 as the drop down box works but all the other options don’t.
Once I knew there was no way of saving and reformating I moved all the back up files onto my computer then erased all the information on the disc, using disc utility to do that, in disc utility I then made a partition and renamed it then went into time machine preferances and clicked on the new name and started back up, it’s working well now.
