A couple of notes:
1) In all but the most extreme circumstances (like, you're planning on installing every package known to humanity), 60 GB for your OS is massively wasteful. You're going to end up with a lot of unused-and-unusable free space. So long as you load your personal stuff (and/or volatile data in general) on separate partitions, 20 GB should be more than enough for your OS.
2) Remember that any data you put on that currently-60-GB volume will get clobbered when/if you need to reinstall your OS.
These two points lead me to revisit my 4th point in my previous post: you should probably rethink your partitioning scheme.
valeriana wrote:Is it possible to format a new partition after installation to replace the /home I'm using now? Maybe there's a textfile to edit.
It's not quite that easy, but it's pretty close. But yes, you can move /home
to your 3rd disk.