The OpenTP1 administrator must initialize an OpenTP1 file system with the filmkfs command. Either a character special file or an ordinary file must be allocated as an OpenTP1 file system area. Initialization is required only once when an OpenTP1 file system area is allocated.

When the OpenTP1 file system is created in a character special file, the OpenTP1 administrator must note that specifying a value larger than the partition size may damage the partitions physically following that partition.

When the OpenTP1 file system is created in an ordinary file, the size of the OpenTP1 file system must be estimated correctly in order to avoid a space shortage.