Folders found in a DVD file structure can often contain a legacy folder called VIDEO_RM. Essentially, this folder is rather useless to most set-top DVD players as it is a folder referenced on Philips brand DVD recorders as well as Philips clones. For reasons unknown, Philips decided not to abide by standards of DVD file structures and used this VIDEO_RM folder to hold information about the recording device a DVD was created on.
The folder, when viewed through several DVD re-authoring tools will show that it is useless much in the same way an AUDIO_TS folder is.
There have been cases where DVDs created with the VIDEO_RM folder have caused several other brands of set-top players, DVD re-authoring programs and other devices to not read the DVD information correctly. Often an error similar to "unrecognized file structure" will be given as whatever device is reading the disk does not understand what to do with the Video_RM folder. Simple fixes include loading the DVD in File mode on certain DVD re-authoring programs and deleting anything associated with the Video_RM folder, then compiling a new, clean ISO.
Related glossary terms
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DVD Shrink (Freeware)
DVD Shrink is a versatile freeware tool for fitting a DVD-Video disc on a single DVD-R