By default ready cache caches every visible hdd partition and not only the system drive, except for removable drives (at least as announced in latest versions). While ago, there was also a post in this forum indicating that it shouldn’t cache a faster ssd if found.
Either way, you have a non documented way of further excluding cached drives. Just open an admin prompt and type:
eccmd -exclude (DriveLetter)
Such as “eccmd -exclude c:” for your SSD, or any other other visible partition with a drive letter. If you try to exclude a drive that’s already excluded, it might spit a phony error such as “You do not have enough privilege to run this program. **ERROR** ECCmd exited with error 0x5 (5)”.
When using a separate partition for downloads, this can be very useful to exclude it. Torrents cause a lot caching due to repeated hdd access, and end up taking a lot of space on the cache SSD that could be put to better use. After excluding such drive letter, I’ve seen readycache immediately releasing more than 6GB of space.
eccmd -clearexclusions
This will reset all exclusions to defaults.