I had a completely different question when I started writing this. My earlier problem was that after I had added my new SSD I had somehow managed to borrow the sata cable to my system disk and connected my system disk to a new sata port. This lead to the system booting but no VMFS datastores thatI had on this drive was visable. After switching Sata cables I now had access t my VMFS data store on my system dive again but now ESXi cant recognise the SSD drive I have tried all free available sata ports with no luck. During all of this I have had another 2TB sata disk connected this has had no issues.
What is going on here? does ESXi somehow lock stuff down a specific sata port?