Smart group for computers with SSD drives?

Think you'll need to create an Extension Attribute to capture this, and then use that data for the Smart Group.

A few possibilities to work off of

diskutil info / | grep "Device / Media Name:" | grep -o SSD

system_profiler SPStorageDataType -xml | awk -F'>|<' '/medium_type/{getline; print $3; exit}'

I'd also do some searches here for any existing more well thought out EAs, as I have a feeling someone already tackled this in an Extension Attribute, and no sense in reinventing the wheel if so.

You can use extension attributes.

You can set input type as a Script.
See the administrator document for more detail. http://docs.jamf.com/10.3.0/jamf-pro/administrator-guide/Computer_Extension_Attributes.html

#!/bin/sh

echo "<result>$(system_profiler SPStorageDataType | grep "Medium Type" | awk '{print $3}')</result>"

I use the script mentioned here to populate an extension attribute: https://www.jamf.com/jamf-nation/discussions/8931/hard-drive-speed-type-extension-attribute#responseChild144484

I was able to successfully create an EA using the script at the link bumbletech mentioned. Thanks all!

Caveat. Machines need to update their inventory to JSS though before the SSD EA will populate the field in the inventory display.