It's all automatic now and I have not found a good reason to go back to manual.

However it is a good idea to know about GPARTED. It's even usable on VM partitions as we read

The unknown megabyte could be partition alignment (more at but again, automatic does this for me and with disk space cheap as borsch I don't fret if 5MB is lost here on a 1TB HDD.)

The only people I know this bothers are the ones the run LFS Linux. More at

By now you get a partial idea of my view on this. I want to spend time using my PC, less time tinkering.