Questions re SSDs and Samples

> Is there a drawback to using 2 different drives for samples?
The more distributed the sample library, the better - especially when you carefully plan storing different type of often used samples over multiple drives.
 
A regular SSD, even lower end ones will out perform about 5 times better than a 7200 rpm HDD (as least for reading data).
 
* Based on estimated round up of 99% usage (HDD) compared to 19% usage (SSD) in this test :
http://forum.cakewalk.com/FindPost/3503896
 
You will even get double SSD performance by doing a RAID-0 setup (no safety, but I guess it's ok for read only samples that you already have a backup plan).
 
* Based on the above test link, comparing 10% usage (RAID-0 2x SSD) compared to 99% HDD.
 
I've no experience in PCIe SSD vs SSD, but unless your need is 5x higher (edit : in performance) than your current HDD, I guess one or more SSD will be sufficient, regular or RAID-0 setup.
 

Performance wise, running a pair of 500GB SSDs is better than a single 1TB SSD.
You have two physical SSDs (each sustaining ~520MB/Sec) vs. a single SSD sustaining ~520MB.
 
If you're running a library like East West Symphony Orchestra... that only allows a single drive location... and you require heavy disk-streaming polyphony; you can put a pair of SSDs in RAID-0 (yields ~1000MB/Sec).
 
If your disk-streaming needs are massive, you can use either m.2 Ultra (PCIe x4)... or a PCIe x4 SSD (PCIe card).
These drives sustain over 2500MB/Sec.
 
Some of our clients combine multiple SSDs to sustain up to 4000 stereo voices of disk-streaming polyphony from Kontakt/etc.  The performance we take for granted today...   
 

You might want to try and sort out the combinations of libraries you most frequently us and ultimately split these between drives to double the load time as Jim says...  I've gotten to the point where I've offloaded TBs of less often used libraries to external drives until I can replace more of my smaller SSD's with biggies...