BDM - AVHCD Information File
This file contains disc information crated by AVHCD video recordings. It can contain information about the file contents in a specific directory location and is most commonly seen as the files 'index.bdm' and 'movieobj.bdm'. These viles are usually located in the AVCHD/BDMV directory of a media storage device. The BDVM derivative files are often seen on optical disc media while BDM files are more commonly seen on non-disc media such as memory cards and sticks and hard drives.