What Is The Smallest Partition I Can Use Disk Utility to Add? I'm trying to add a new partition to my Macbook, in order to dual boot with Linux. I have a 250GB drive, with 70GB free. However when I try to use Disk Utility it says 
"This volume can not be split because the resulting volumes would be too small."



This answer tells someone having the same problem their drive is simply too small. Can I really not create a 70GB partition? What is the smallest size I would be able to create?
Disk Utility will not allow a partition smaller than 10% of the disk size, so creating a 70 GB partition shouldn't be a problem for you.
Try deleting all local Time Machine snapshots:

 tmutil thinlocalsnapshots /


If that doesn't work either, I'd recommend using a Live System such as Knoppix.