Can anyone clue me in on why I cannot load MP3's on SD card? I had originally loaded MP3's on internal memory, then found out not enough room for a reasonable sized music file, so purchased and installed SD card.

Do I have to dump original music folder, then reload new to SD card?

After plugging SD card to Mac laptop, cannot drag and drop from I-Tunes folder as I had
done initially.

Any link to detailed instructions would be helpful, instructions with garmin 665 not so good....

thanks in advance.