Nexus devices have no SD card slots. Why ?
Missing SD card slots in Nexus devices shouldn't be looked at as a disadvantage. Read this to get the full picture.
Google still supports removable storage in Android, but it is leading by example and providing phones (and now a tablet) with one big block of storage that users can use for anything they like -- be it media, documents, or apps. There are a couple of side benefits to this approach as well. The first one is a bit geeky -- it allows the device to use ext file systems instead of a mix of ext and FAT. This is faster and safer -- both for the data on the device and the way it's handled, and access to our own personal data. A journalized file system means fewer file errors, and ext preserves file system permissions so random code can't find your pictures or documents folder.