I too have a minidisc player. Several actually. I have a <A HREF="http
/www.usa.denon.com/catalog/photo.asp?s=home&p=DMD-1000&f=Dmd1000.jpg&c=57" target="_new">Denon DMD-1000</A> Minidisc deck, a <A HREF="http
/www.minidisc.org/sonyim/MZ-R37_S_01_low.jpg" target="_new">Sony MZR-37</A> portable MD recorder, and a <A HREF="http
/www.minidisc.org/part_Sony_MDX-C8970.html" target="_new">Sony MDX-C8970</A> head unit in my car.
The reason I went with Minidisc is that I wanted a way to listen to my extensive CD collection without having to risk damaging my originals. I could either have gone with CD-R based MP3's or MD's. I chose MD simply because the ATRAC compression used by MD sounds much better than MP3 compression.
But, if you're not a "golden-ears" and you can't tell the diff between ATRAC and MP3, then you are probably better off with MP3. CD-R's are much cheaper than Minidisc's, and MP3 capable CD players (portable, car, what-have-you) are becoming commonplace whereas MD never really caught on in the US.
And no, you can NOT store MP3's on Minidisc. You can play an MP3 and record it to Minidisc, but that's really not a good idea. You'll be applying ATRAC compression to an audio source that's already been compressed. I can't see how that would be a good thing, although I've never tried it. At best, you'll have something that sounds like an MP3 stored on a medium that is capable of much better quality. Really makes no sense to go that route.. may as well go with cheaper CD-R's.
However, an MD, IMO, is much sexier than a CD-R, and all MD's are rewritable, so you don't have to keep buying new ones when you want to expand/change your music collection. Just erase one and re-burn it. Not that that's really an argument, though, considering how dirt-cheap CD-R's are.
Also I should mention that newer Minidisc players that use the ATRAC3 compression (also known as MDLP or "MiniDisc Long Play") can hold 160 minutes in LP2 mode, or 320 minutes in the more compressed LP4 mode. All on a single tiny minidisc. I have not heard ATRAC3 so I cannot comment on its quality VS. MP3, however.
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Armadillo<font color=orange>[</font color=orange><font color=green>TcC</font color=green><font color=orange>]</font color=orange> at Lanwar and MML