I have an HTC Desire running Android 2.1, unlocked from T-Mobile that I bought on ebay a few days ago. Everything is fine with it, but I'm experiencing a problem with the standard music app and I can't find a solution online. I've been loading songs onto the device using the USB cable, with the phone set to Disk Drive. For the first tens of (100?) songs this was fine, with mp3 and m4a tracks being loaded without a hitch. However, now the library is showing 100 tracks and strange things are happening. I can load mp3s onto the device as before and they show up initially, I can even play them from the file manager, but when I restart the phone to pick up those songs into the Music app, the files mysteriously disappear from the 32Gb SD card. Thinking there might be a limit to the number of songs allowed (surely not?), I deleted some so that there were less than 100 tracks. I copied a new song to the drive and could play it on the phone by firing up the track in File Manager. Thinking that had solved the problem I rebooted the phone. When I did so, the song was not found by the Music app. I went into file manager, opened the artist directory, opened the album subdirectory and the song had gone. Further, when I went up 1 level, the album subdirectory had gone too! Does anyone have any idea what is happening? Am I doing something wrong? Is there a better music app out there that doesn't delete your files?