Should come Capacity and Cache drives but it not reflected.
Ensure that the disks:
1. Have no pre-existing partitions on them
2. Are detected as Local devices (and mark them as Local if not) &
3. Are marked as Flash devices (if Flash and not detected as such).
Please help to share the process for 2nd and 3rd point.
Please validate that you have checked there are no partitions:
Host > Configure > Storage devices > Select device > Scroll down in the Device Details Properties info to 'Partition Details' Primary Partitions should be 0 for this to be an eligble device for claiming by vSAN.
This can also be checked via CLI with vdq -q command or by checking for partitions on the devices in /dev/disks (e.g. it will be naa.xxxxxxxxxxxxxxxx:1 naa.xxxxxxxxxxxxxxxx:2 if there are pre-existing vSAN partitions).
If they have partitions on them and you are POSITIVE you don't needs whatever data is/was on the devices then remove the partitions: