Thank you for your quik reply.
How does Parity work? If we imagine - for exampel - I have 230 TB full of data + 10 Parity, if 3 Disks fail that means 30 TB. How can one single 10 TB Parity disk contain all data out of 230 TB?
My solution was now. I had a 2x of 2TB HDDs an one 10TB diks for now. I had not so much data on them. I cleand all disks with Gparted (KnoppixLive CD/USB) and cleand the USB Flash drive with Unraid.
Installed new Unraid on my USB Drive. And Started the Array. To format the disks took me minutes.
Parity ist enebled now on additional 10TB disk. Now think I will risk and do not use parity.
How can I remove the Parity disk and use it like normal storege dirve? Should I completely erase the old configuration.?
Thanks for your support.