recommended partitioning for 80 GB Drive

The documentation says

so for an 80 GB drive this would translate to:

Can someone run down what is stored in eacn partition?

I take it the bulk of web site data is stored on the /home partition?

Where is mysql data stored?

Logs for each web site?

 

also: best use of second hard drive

Also in conjunction with the above question, if I have a second 80 GB drive, what is the best use of this drive for performance and security in addition to using it for backups?

Should I move mysql data to the second drive for example and will this create any problems for cPanel? Or is there a better use of the second drive? How will this impact the default partitioning layout and sizes I should choose?