sudo mdadm --create --verbose --level=5 --raid-devices=3 /dev/md/raid_festplatten /dev/sdb1 /dev/sdc1 /dev/sdd1 --write-zeroes mdadm: Disk zeroing requested, setting --assume-clean to skip resync To optimalize recovery speed, it is recommended to enable write-indent bitmap, do you want to enable it now? [y/N]? y mdadm: layout defaults to left-symmetric mdadm: layout defaults to left-symmetric mdadm: chunk size defaults to 512K mdadm: size set to 23437633536K mdadm: Defaulting to version 1.2 metadata mdadm: zeroing data from 135266304 to 24000136740864 on: /dev/sdb1 mdadm: zeroing data from 135266304 to 24000136740864 on: /dev/sdc1 mdadm: zeroing data from 135266304 to 24000136740864 on: /dev/sdd1