I'm trying to use an M2-to-SATA adapter to connect a 2.5" ssd to the M2 slot (I already have the ssd lying around and I'm planning to use the on-board SATA port for another disk). I got one of these: http://www.iocrest.com/en/product_details546_a.html The Udoo x86 user manual says the m2 slot supports both SATA and PCIe. However, I can't get Udoo x86 to see the disk (neither from the boot menu of the BIOS configuration, nor from a linux distro booted from usb). This is my current setup (having disconnected all non-relevant cables): If I connect the same disk to the on-board SATA port then it works perfectly, so I'm sure the problem doesn't lie in the disk itself or in the SATA or power cables. Am I doing something wrong or is this actually not possible? Is there something that needs to be configured in the BIOS settings?