Information about logical drive if it is bootable.
1: No (read only)
2: Yes
255: Unknown (read only)
Note: 1. CacheCade logical drive can't be set as bootable drive.
2. Noraml logical drive(not cachecade) during offline state can be set bootable successfully, but readback value of logicalDriveBootable
is still 'No' unless change the logical drive state to online.