64 GB Plug-in eMMC 5.1 Flash Storage Module for ROCK Single Board Computers. Advantages of the eMMC Flash Storage Module for ROCK: An ideal storage solution for ROCK Single Board Computers – eMMC modules benefit from fast speeds and maximum energy efficiency. It is the perfect storage solution for a variety of electronic devices. This eMMC 5.1 module is optimized for use with ROCK Single Board Computers, but it is also compatible with ODroid and PINE.