I have just gotten Surface Pro with 512GB internal SSD drive and want to reduce the partition to create a data partition.
I tried using the utility which comes with the OS(Disk management) but it allows shrinking it no less than about 260GB. Next I tried a third party utility(Partition Master) which I have used and familiar with but ended up with messed up partition.
I restored the original condition using the recovery drive. My present thinking is to install W10 and in the process set the partition for the size I want. Is there any other idea? Any suggestion?