Why? Until SSD drives get much bigger and cheaper, we’re going to have to run a balancing act between what NEEDS to be on the fast drive and what doesn’t.
I have three drives. C: is a 120GB SSD. There’s also a large, fast mechanical drive (D:), and a large “green” one for storage (E:).
Windows is on C:. Having it boot quickly is fun! After that, it probably makes minimal difference. Some applications that I may want to call up quickly, maybe while working in another program, are in C:/Program Files or C:/Program Files (x86). Most applications are in D:/Program Files or D:/Program Files(x86). My Documents is on E:.
I’m not a terribly heavy-duty user of sample sets. I have some larger ones on C:. If I needed optimum performance in this area I’d probably (on this system) have put system and programs on the fast mechanical drive, reserved the SSD for just samples. Or I’d have saved up for a larger SSD.
A lot of system stuff can be easily moved off the “Windows” drive. I synchronise some saved data with another networked computer using Offline Files. Moving the (quite large) local cache off the system drive is more tricky, but possible.
I will be very interested to see (a) how long the current generation of SSD devices last and (b) how long it takes before SSD sizes go up and prices come down.