A SSD outperforms a HDD in any scenario by large scale! Especially when it comes to random read/write of small files. AE cache files are around 8MB (version 14.2.1). Putting this files on a SSD will speed up your workflow. Due to lates real-life tests, Samsung 850Pro SSDs last for at least 2,2 PB, up to 9,1PB (SSD-Langzeittest beendet: Exitus bei 9,1 Petabyte | heise online ). So I wouldn't worry much about lifetime, when you use a SSD as cache drive. Also keep in mind, that the cache drive don't hold any critical data. When it dies, simply replace it. Prices are constantly falling. No big deal. In my setup, I have 1 SSD for system and applications, 1 SSD for cache and 1 NAS for project files. I only use Samsung 850 Pro SSDs. We have a newly build workstation at work, where we got 1 SSD for system and applications, 1 M.2 SSD for cache and again the NAS for project files. Again, all Samsung 850 Pro (M.2 is EVO due to availability). Reading and writing speeds are very high, around 400MB/s for SSDs, and above 1GB/s for M.2. To give you a clear answer to your question: No, it's not OK to put System, Applications and AE Cache on the same drive. Keep in mind, that AE cache will let your drive die faster (even if it took a long time), prepare for that case by separating critical data with none critical ones. It doesn't really matter, where your project files are stored. This will only affect the time it needs to be loaded into RAM. When you have an additional SSD, than use this one for cache, even if it's external. Cheers, Martin
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