Advanced disk space

I´m running out space in my "advanced disk" but in my MSDP I have plenty of space. So I need to know if there is way to "take" some space from MSDP in order to add some TBs to advanced disk?

If so, this process involves lose data from MSDP?

For full, differential and transaction logs backups which type of disk is better?? MSDP or Advanced Disk?

Just FYI Im talking about Netbackup 5230 appliance (2.6.1.1)

Any Ideas... 

Thank you guys!