You'll run out of room, no explosions

You have two options.

One is to only add to the Library what you need to annotate or link to eBooks. PDFs you're just reading, or MP3 music files and MP4 video files you're just listening to or reading, can be on your SD card - the Media Player will find these files wherever you are, and the PDFs you can find by using the Library "Storage" browser (they'll open on the eInk side, or in PDF Docs To Go - the eDGe will ask you which).

The other option is to move your Library storage to your SD card (see https://www.entourageedge.com/suppor...barticleid=134 for instructions). I personally am still wary about doing this (I'm not 100% certain it's completely safe and bug free), but others have done it successfully. The one caution is that you have to keep the SD card plugged in all the time (as far as I understand it). The advantage is your Library can now be up to 32 Gb in size.

If you don't have more than 2Gb of EPUBs and PDFs that you have to have in your Library (2 GB is enough for 2,000-4,000 typical novel-like ebooks), then I'd keep the Library where it is, and store your MP3s, pictures and MP4s on your SD card.