I am sorry you are having problems with the system but let me help you.
It is important to say that in order to have enabled the acceleration feature you must comply with the requirements at this link:
Since you have a laptop, most of the times Computer Manufacture set limitations on their units that we cannot over pass.
In regards to your question, it is necessary to have the chipset mode set as RAID but doing this, if the Operating System was installed in AHCI it will not boot once it has been changed. In the case you set it as RAID it will be necessary to install the Operating System.
Hi Kevin, thanks for your clear answer. It leads me to ask one more question relating to this, and I hope you may be able to answer it as well.
So... let's drop the question of RAID and Disk Caching and move on to a second question.... I would have expected that the system would have 'seen' the second disk drive when I added it to the system instead of failing to boot in such an ugly way. Is AHCI somehow limited to seeing one disk drive? Or is this one of the limitations that the computer manufacturers create? If it's the latter can you suggest how they create such a limitation?