I'm having problems with the external SD Card. I plug the card into it's adapter, that into the computer, and put music files in the "moibile, music" section. But when I eject the card and plug it into my phone, it won't play and says, "File corrupt". How do I get music onto my phone?

You can get an adapter cable that will fit into the tablet's USB port. It's called an OTG cable. With that, you can hook up cellphones, digital cameras, thumb drives, SD card readers and many more things. The best way to do that would be to get an adapter OTG cable and a card reader. You can also transfer it to a computer and then to the SD card. If you don't have a card reader most digital cameras will work as one. Hook the camera to a ps and look for it in my computer folder. (works on macs also) and opens it. There you can put any file on the SD card. If using an OTG adapter to just hook it to the device's USB port and go to your file manager app. I would recommend an app called ES File Explorer. it makes it simple to find files on Android devices. Once you locate the drive (usually it's called USBDRIVEA) just transfer the music. Here is a link to a video that will help. I take no credit of video.

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Get the external card reader and connect in desktop machine or laptop. Insert the SD card in external card reader and browse the SD card content in My Computer. Choose & copy the files, data, music files in local drive then paste the data in the SD card.

To connect the SD memory card to the computer you need a USB memory card reader. Plug the SD memory card into the USB card reader and then plug the card reader into the computer's USB port.
The computer will see this as an external memory card, you can then click on this memory card (it maybe the D or E or F drive) and select the music files from your computer then copy and paste your music files to this memory card. I presume the music files you need to copy are MP3 or MP4 files.

You need a standard SD digital memory card (not the newer HC high capacity cards as Magellan does not guarantee compatibility although I did get one to work that was a micro SD card with the full SD adapter). You will need to put your mp3 music files from your PC onto the SD card just as you would your mp3 player; insert the SD card into an SD slot on your computer, laptop or USB adapter and copy the files to the card. After files are saved, put the card into the slot on the right side of the Maestro and then refer to the User Manual (http://www.magellangps.com/support/product.asp) page 64 to see how to play the music. You can play through radio speakers or by using headphones/ear buds with a USB connector.

you have to tell it to look in the sd card not the stock folder
You can put it on the card with an adapter or hook up the phone with it in and it will show up as an external drive then just drop the music in then

most mini sd cards come with a full-sized sd card adapter that the mini slips into. You can then slip that in your computer if you have an sd slot or sd reader.
You can also buy very inexpensively, a usb port mini sd reader that you can plug directly into your usb port on your computer. Then after you'v dragged and dropped the files, you can put the mini sd back in your phone.

You have to drag and drop only the MP3 files into the music folder. If you have them organized and in folder by artist, drag only the MP3s into the card's Music folder.

omg... put your memory card with the bigger card witch you get when buying a memory card into the computer. i do everything with usb but if you cant then do it this way

The software it comes with doesn't do anything for music. When you hook it up to the USB it should go into mass storage mode. Then you just drag and drop music files over. The only problem I'm having is figuring out which folder to put music in since there are 2 menus for sounds/music on the phone. And when you plug the phone in, it brings up 2 drives. One for the internal phone memory and one for the external memory card.