Well, nobody really knows percentages of folks with 1 drive, versus 2, or 3 or more, but if you can split things per the post abovem, if you have 3 drives available, that would be great.
If you have only a single hard drive, you will have some performance issues, because the operating system, the Sonar program and any loaded plugins, any loaded sample files, and reading and writing of projects, would all fight for the same physical drive read/write heads.
So, most folks get at least 1 additional drive, a smaller percentage pick up a 3rd, less than that pick up a 4th, etc. At some point, there are some diminishing returns and it just will stop giving you performance benefits to keep adding hard drives and further splitting things across them.
I happen to run with 2 main drives, and I split things as follows:
Primary Drive (C:) - Operating system, program files (including plugins), the hidden Windows folders (application data, etc.)
Data Drive (D:) - My user folders (documents, pictures, downloads, music, desktop), All of my sample libraries (Kontakt 5, Session Drummer 3, Battery 3, etc.), as well as any Cakewalk Content (projects, templates, documentation, global audio, Perfect Space impulses, etc.)
As noted in the other post above, the other poster has an additional drive, and they split things I have combined on my Data drive to their 2nd and 3rd drives.
The whole point of any of the above is to reduce/eliminate performance bottlenecks caused by fighting to access different places on a single drive at the same time. So, as I record, I will read and write a bunch of files to my cakewalk project's folder, principally audio clips, and I also have to deal with loading samples for instruments such as Kontakt 5.
I could achieve better performance by adding that 3rd drive, but since everything is running OK for me with the 2 I have set up, I won't worry about it for now.
I also have the benefit of having 32 GB of memory in my computer, so a lot of samples just get completely loaded into memory and then they aren't a performance issue having to get loaded from the drive like they would if I had less memory, like 4 GB. Then I would likely need to add that 3rd drive, like the other poster.
I hope that helps explain things a bit, Greg.
Glad you are asking questions here in the forums, and reading, and such. YouTube also has a bunch of free videos you can watch for doing things in Sonar, or just for general mixing and recording information. Cakewalk TV has a lot of that too.
Hope things are getting better for you for your system and for your knowledge level for Sonar. Keep posting issues in the forums, and as you see, folks will indeed invest time and effort into assisting you with working things out.
Bob Bone