Avi playback problem

[mickos]

playback of downloaded avi on laptop is fine but when copied to external hard drive and played from that you only get video and backround sound no voice.

 

[simsaladimbamba]

playback of downloaded avi on laptop is fine but when copied to external hard drive and played from that you only get video and backround sound no voice.

More information is needed.
What Mac OS X version and what video player software (and version) do you use to play those .avi files back?
Have you checked Finder > select external HDD >> GET INFO >>> Format and Sharing & Permissions yet?