Memory card insert/remove on Nikon D3100 DSLR - YouTube
Nikon D3100 Review
Nikon D3100 Digital SLR Review | ePHOTOzine
Amazon.com: Synergy Digital 8GB, SDHC UHS-I Memory Card, Compatible with Nikon D3100 Digital Camera Memory Card - Class 10, U1, 20MB/s, 300 Series : Electronics