Hi,

it's now solved:

- installed newest firmware on Areca-Controller
- reboot the NAS

Addendum: 4 last years replaced disks are show as current SATA150 (Backplane supports SATA300)
all other disks: are current SATA300
replaced this 4 ST1000NM033 by HUA721010CLA330 => current SATA300
Nice feature: ST1000NM033 in a newer Eurostor-Box with newer ARECA: current SATA600 (disk is able)

Thanks, Harald