Sony MZ-NH1 Net MD/Hi-MD Walkman Portable Minidisc Player/Recorder Store up to 45 hours of music on a Hi-MD MiniDisc Sturdy, all-Magnesium construction Includes backlit LCD tuner/remote with editing functions Skip-Free G-Protection technology &lt;b&gt;NOTE:&lt;/b&gt; The MZNH1's recording features and bundled software are not compatible with the Mac OS operating system.