User`s manual

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Alcorn McBride Digital Video Machine DVM-7400 User’s Manual Rev 1.5

File System Limitations – 2GB File Size

If the File Splitter

software is no longer

available, please

obtain the latest

manual from the

Alcorn McBride

website, or contact

technical support for

the latest

recommended method

for splitting files.

The split-file playback

feature requires

firmware V1.64 or

newer to work.

The Digital Video Machine uses a special implementation of the FAT32 file system.

This file system is widely used, and will allow your flash cards to be accessible from

any Windows based PC or MAC computer.

Although the supported volume size of Compact Flash cards is much larger, the

maximum file size supported by the FAT32 implementation in the reproducers is 2GB.

Your Windows PC will allow you to copy a larger file (up to 4GB) to the flash card, but

the reproducer will not be able to access this file. This will result in a fault condition

(Red flashing LED) if you attempt to play the file.

If your application requires a longer playback time than a 2GB limitation will allow, the

best solution is ‘split’ the file into several segments using a file-splitting program. One

suggestion is a software package called File Splitter, which can be downloaded at

http://www.filesplitter.org/. Using this method, a large file can be separated into

several segments which a reproducer can treat as a single coherent video file. Here’s

how it works.

Let’s say that you have encoded a 5GB video file (Program Stream) that you want to

play in the DVM. First, you will need to use a utility (like File Splitter) to divide this file

into several chunks smaller than 2GB. To be safe, you could divide the file into 1GB

chunks. When the splitting process is complete, you should have 5 files. Rename

those files like this:

VID00001.MPG

VID00001.001

VID00001.002

VID00001.003

VID00001.004

Keep in mind that VID00001.MPG is the first segment, VID00001.001 is the second

segment, and so on. When you are finished renaming the files, copy them to the

DVM’s Compact Flash card.

At this point, all you have to do is treat VID00001.MPG as you normally would. For

example, if you send a command to Play File #1, the reproducer will automatically

play through all of the file chunks without you having to do anything special. You can

also send a command to Loop File #1, and the entire file will loop from start to finish

just as you would expect.