Thank You the info. According to that my suspicion about the <Alt> + <B> was correct. But this combination is not active. I want to make an IM volume with two disks. I can make it, but when I select a disk for boot in the SAS Topology screen and press <Alt> + <B> nothing happens. There is a note in the user's manual which says that the firmware must be configured correctly to make <Alt> + <B> work. I left everything on the default value. The Boot support is set to "Enabled BIOS & OS". What could I miss?