Analyze HDDs Network Wide

Alright, so I am looking for a utility that will analyze HDDs of client computers on a Windows Network. I've looked around and seen utilities that will defrag any number of computers on a network, but really I don't want that as they require an agent to be installed, and I don't want to install anything else on the client computers, they are full to bursting. Anyway...
So just a utility or program that would analyze the disk of each client computer, and generate some sort of report or list of client computers in need of a defrag that I would preform during off hours, or schedule to run late at night. Anything like that exist?

Wouldn't it be easier just to use task scheduler to ensure the computers run their own maintenance cycle I mean you could create 1 task and then just import / export to all the systems on the network.

How many machines are we talking about here?

Maguscreed said:

How many machines are we talking about here?

70-ish.

yeah I know of some software that will allow you to get folder/filesize / freespace reports
but nothing that will simultaneously analyze fragmentation on 70 machines.

GeneO said:

Just how would you do that without an agent being involved since Windows 7 does not have this built in?

You can get loads of information through SNMP, I was just wondering if you could get fragmentation analysis through any kind of program or utility. Not a big thing, I was just trying to make a list of what computers to hit first, which ones were in need of the most help.