I found well one well-known site where you can buy it by hand. It ended up being cheaper. In fact, I took a new one, since the person took it out of his DS1520 + to put 2 x 10 GB. Although I probably even regular 2 GB in DS720+ would be enough. Usually around 10-15% memory usage was. Now draws 5%. But I just bought a NAS, I haven't uploaded it yet, I just uploaded the pictures.
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