DELTA 53643 0 50 SVN† † † † …× …Ú|ƒoƒÍ€ƒm‚‰zƒÍƒm Using an entire disk as part of a bootable pool is strongly discouraged, as this may render the pool unbootable. Likewise, you should not use an entire disk as part of a mirror or RAID-Z vdev. These are because it it impossible to reliably determine the size of an unpartitioned disk at boot time and because there's no place to put in boot code.