Hi, I'm wondering would it be better for me to have SSD is instead of HDD on my DS 920+ the thing that I want to do is to reduce the lag when I'm using Synology photos. This will this help with SSD's I have over 20,000 pictures and small videos. Sometime the video does not load sometime takes a long time for it to load if I were to buy for 4 4TB SSD and use them in the raid do you think this would help. I have cash on my DS920+ read and write 1 TB but it did not help. Another question that I have is now I have 3 8TB hard drives and one 4TB hard drive. Would it be possible to maybe keep the three 8TB HDD in one storage pool and then remove the 1 4TB Drive and replace it maybe with one SSD in a separate storage pool. Would this also require formatting the whole system?