Why doesn’t the Galaxy Nexus appear as a remove disk on a Mac?
Before Android 3.0 devices typically divided their storage into two separate partitions, a system partition and a media “SD Card” partition. When a device was plugged into a computer, it would mount the second SC card partition using USB Mass Storage, just like a regular flash drive. With newer versions of Android, manufacturers have the option to used just one big partition for everything, which is convenient for the user of the device, but slightly complicates computer connectivity. The Galaxy Nexus is the first phone to follow this model, and you can bet other phones will too in the future. Devices with SD card slots will continue to use USB Mass Storage for SD card file transfers.