Methanoid

To be able to stop in a track and resume on power on at that spot... I listen to lots of old radio plays etc and they tend to be 30 minute broadcasts that I now have in one MP3 file. My train journey is rarely enough to fit a whole show so I would like to resume where I left off. Is there any MiniDisc that does this? If there is a choice even better. I tried FAQs but the bookmark facility they mention sounds nothing like it. Thanks Meth