Disc Space Monitoring

Hello,

I have been trialling the free (10 device)version of Opmanager and
I have a number of questions as follows.

1. Disk space usage only shows Total utilisation - is there a way of breaking this down by volume?
2. I can only get meaningful data from Windows 2000/2003 Servers. I don't get anything from NT servers other than Uptime.
3. can I get info from Netware 4 servers?

all the above have SNMP enabled

Thanks for any help

Paul