There are numerous posts and discussions on the hardware used by the Gen 2 single bay My Cloud units versus the first Gen single bay units. One can find them by using the forum search feature, magnifying glass icon upper right. Here are a few such posts:
http://wdstagingsplit.staged-by-discourse.com/t/my-cloud-specifications/181602
http://wdstagingsplit.staged-by-discourse.com/t/fw-versions/148668/12
One can generally determine the generation version by looking at the P/N number on the bottom of the single bay My Cloud or the P/N My Cloud product box. Generally the version 2 single bay My Cloud units will have a “-10” at the end of the P/N number. The first gen has “-00”. An example of the P/N number on the single bay My Cloud product box:
