Do not protect this file system from being mounted in read-write mode by multiple file systems simultaneously (NOWRITEPROTECT)

The default is WRITEPROTECT. Use NOWRITEPROTECT only when there is no possibility of the file system being mounted by multiple systems. When NOWRITEPROTECT is specified, the file system is not protected from being read-write mounted by multiple systems simultaneously. Read/write mounting by multiple systems corrupts the file system. Use of the NOWRITEPROTECT keyword avoids an additional file system read operation that is required at Sync time to support the WRITEPROTECT function.

NOWRITEPROTECT is the default, meaning that the box is unchecked and the file system is not protected from being mounted in read-write by multiple systems simultaneously.