Pre-installed Ubuntu15.04 or latest version.
Ready to run out of the box

eMMC Version 5.0 interface or higher version from Toshiba or Sandisk.
JEDEC/MMCA version 5.0 : HS400 interface with 8bit DDR mode.

Schematics : http://dn.odroid.com/eMMCModule/

Note:

The supplier of the product has no replacement and/or refund policy as part of their product warranty/guarantee. Furthermore, the repair cost and the cost of shipping to and fro from South Korea has to be borne. As Fab.to.Lab is merely an intermediary we extend the exact same warranty terms to all customers of Harkernel.

Please find more details here: Supplier warranty terms and conditions: https://www.hardkernel.com/agreement/

You need the above eMMC Module Reader to update the OS of the eMMC Module. Transcend USB multi-slot SD Card reader in the below picture is not included.

More about the eMMC Module : http://odroid.com/dokuwiki/doku.php?id=en:emmc_reference_chart

SD/eMMC PERFORMANCE

You can boot from a MicroSD card or an eMMC module. The MicroSD interface supports the higher performance UHS-1 mode as well.
File access of a 512MB file (read/write) on three different storage options shows distinct performance differences.
The eMMC 5.0 storage is ~7x faster than the MicroSD Class-10 card in read tests. The MicroSD UHS-1 card is ~2x faster than the MicroSD Class-10 card in read tests. The MicroSD UHS-1 card provides a great low-cost option for many applications!

Write command
sudo dd if=/dev/zero of=$(mount-path)/test oflag=direct bs=8M count=64

Read command
sudo dd if=$(mount-path)/test of=/dev/null iflag=direct bs=8M