Thru NPM, u can monitor your servers which will provide the basic parameters like CPU, memory disk, any connected ports etc... and the licensing of this will be same like NPM..
Ex: if u have a server with 4 drives on it then it will consume for 4 drives+ 2 for memory(physical and Virtual).
But if u want to get detailed insight then SAM is better option as that would also give you hardware monitoring, application monitoring using templates etc...
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SAM and NPM both share the same core orion features when it comes to your example of monitoring disks for size and space and alerting at 75% full. In environments with SAM and NPM licenses they basically stack anywhere there is an overlap in their licenses. So, for example, an NPM100 would allow monitoring up to 100 nodes and 100 volumes and 100 interfaces, if you added a SAM700 license you would now be able to monitor a total of 800 nodes, 800 volumes, and 800 interfaces and you should see this reflected on the license details page. The process for adding SAM nodes and monitoring their volumes and setting up on the alerts on it should be exactly the same as it would be with NPM as those are all considered core Orion features.
You can monitor Disk Size and Space left in them using NPM. And licensing is based on number of Elements.
Elements can be - Node itself (as 1 element), CPU and Memory another element of that node, Interfaces, volume disk.
So for example - if you are monitoring one node with CPU and memory and 5 disk volumes nd 5 interfaces then the license required will be as below -
1(Node)+1(CPU and Memory),5(Volumes),5(Disks) = 12 Elements
Using SAM you can perform lot many things like file size inside the disk volumes, URL Monitoring, Server process and Services monitoring etc and its licensing is based on Components.
Component is part of application template like - one process monitor or one service monitor is one component similarly it will keep adding other stuff for licensing part.
How to alert when 75% space is used - simply first add the node using either SNMP or WMI (windows box) or Agent (Windows/Linux) now manage the disk volume that you want to alert on.
Once it gets added then got to Alert Manager and create new alert based on Volumes in the trigger object - now select volume based on any criteria that you find easy and set the threshold for alerting. You can configure Email action on top of it to get the alerts to your inbox.
From the problem statement that you have posted -> Baseline is go with SAM if its a system/server infra, yes it provides base monitoring (Server availability, CPU, Memory, Disk) + application monitoring(probably it has 49 component monitors which includes several app monitors) through SAM