I would surmise the signature edition contract with Microsoft probably requires Lenovo to have their laptops at optimal performance. Suboptimal performance must

I would surmise the signature edition contract with Microsoft probably requires Lenovo to have their laptops at optimal performance. Suboptimal performance must not occur, hence the blocking of other non-RAID options. It would be interesting to see how this is achieved in other pc's in the signature edition range : https://www.microsoftstore.com/store/msusa/en_US/cat/categoryID.69916600 https://www.microsoftstore.com/store/msusa/en_US/cat/categor...