I installed W10 Pro x64(v. 1511) on Boot Camp partition on Macbook(Skylake). The Boot Camp partition is 370GB and I want to create a 270GB data partition out of the Boot Camp partition.
I installed a third party utility called "iPartition v.3.5.1" and attempted to shrink the Boot Camp partition to 100GB but failed. Error message is as follows:
Repartitioning Failed
iPartition was unable to get write access to the
"Apple SSD AP0512J"(disk0). This may mean
device is write protected, that you do not have
permission to access it, or that it is in use by
something else.
I did once create a data drive out of Boot Camp 5 years ago on Macbook Air using iPartition.
I wonder if there is anyone who did what I am trying to do.