Wrong beaner, using a third party app to resize a partition so they have some free space to install whatever OS they were wanting is far more reliable than leaving it to a built in partitioner on an OS disk(indeed you can't even resize partitions in most).

What was stupid was using the install OS option in partition magic which never works and is completely unnecessary. All you ever need to install another OS is some blank partition space, the installer will always allow you to create the partitions.