Bests & Worsts Reviews from Amazon

A NAS should NEVER lose data. The DS1019+ failed and gave a message that the cache cannot be found. It also said there were some bad sectors on disk 4. I could not recover my data :(. The DS1019+ does start up and I can access it but that is all. I can't initialize the cache on the 2 new 1 TB SSDs I bought to replace the old ones that I later tested and found out they are good according to Windows 10. I want to return it. I have the cost of the synology, 5 6TB WD Red Pro drives 4 1T WD black SSD. I have wasted too much time. I have determined that the 4 1 TB WD SSD are good so why can't I create the cache? If a drive fails I shouldn't loose the volume. I have a spare 6TB drive. I have wasted too much time with this. I am going to buy something else but I have no place for 4 1TB SSD that cost almost $230. I am livid. Do not buy. A NAS should never lose data.