Figured as much when I saw the 120GB capacity. You may have problems trying to get an SSD drive to work with the first gen single bay My Cloud. As indicated in a post I did on using 2.5 inch hard drives with a first gen single bay My Cloud I couldn’t get SSD drives, two different manufacturers and capacities, to work with the single bay first gen My Cloud.
[Guide] How to use a 2.5 inch hard drive in a single bay My Cloud
Note on SSD Drives: I tried using two different spare SSD drives (a 64GB and 120GB drive) and was not able to get either one to properly boot. Both got stuck with a Red front LED and no Dashboard access. Multiple attempts at cloning and manually running the unbrick process failed. Not sure if its an issue with the drive small size or with an incompatibility between the firmware/hardware of the My Cloud and using an SSD drive as the main drive. YMMV Others may have better luck with their SSD drives (or not).
