File created by EnCase forensics software; stores a collection of individual files that have been selectively copied from an EnCase evidence (.E01) file; allows smaller collections of digital evidence to be grouped without having to load the entire E01 evidence file to view them; used for storing noteworthy evidence.

You can selectively choose to include the contents of the files for an L01 file. If you don't include the contents, then only the filename is known, and you then must reference the original E01 evidence file to retrieve the contents. You may also choose to hash the files so the investigator can verify that the contents have not changed. The LO1 format was replaced by the .LX01 format.