For most portable storage devices, you simply connect it to your computer using the supplied cable or in some cases, a generic USB cable. When Windows recognizes the device it will appear under the listings in "My Computer". Simply "drag-and-drop" the music files from your desktop computer to the portable device. Or "copy and paste" them to the device. Note that files shown as "protected" will not be recognized by most players.
I have a CD/Cassette player in my 2004 4runner. It has integrated touch screen with Nav. My CDs...
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I have a CD/Cassette player in my 2004 4runner. It has integrated touch screen with Nav. My CDs won't play. The unit says "CD Check" Radio, Cassett, & Nav all work fine.