@mariosipad
ok, 1500 MHZ, 75-77°C
Well, generally you're right the time concerned to read and write, on the other hand it just happens once, afterwards only new added folders will be indexed in a shorter time...
Nevertheless: I like to thank you again for your comprehensive and patient help, it is highly appreciated. I probably have to come back as I just have access via the ip-address, not via freemyip - but now I will wait until all files are read
btw: I just bought the PI an aluminium case for passive cooling