My N600

I have a N600 with an external USB hdd connected to use as TimeMachine backup server for my laptop. I have formatted the USB hdd with my laptop but once I connected it to my N600 the names are completely different. I was wondering if anyone knows why or how I can rename partitions on the hdd back to what I had before?

I believe  that time machine will rename the partition when you are creating the backup.

What’s the name that the partition is getting?