Meanwhile I got a Raspberry PI 4 and built a new NAS system. Here I installed a Debian Buster Lite and connected a Seagate 5TB 2.5″ hard disk. (Picture shows a WD HDD as test system) With Samba I also have access from a Windows computer. The speed is very good. I can transfer about 75MB/s over the network. So far the heat development is eye-catching and is monitored it.