If you are cobbling together a home lab for ESXi, sometimes you’ll be reusing various disks that have been used in other computers with other operating systems. This can cause a problem for ESXi when you want to format a disk as a VMFS volume if there is an existing partition table and you want to format it using GPT for VMFS-5 and there is an existing MBR partition.
When you try to format the disk you’ll get an error like:
Error:A specified parameter was not correct.
Vim.Host.DiskPartitionInfo.spec
Error Stack
Call "HostStorageSystem.ComputeDiskPartitionInfo" for object "storageSystem" on ESXi "x.x.x.x" failed.
On my Mini I have a hard disk and an SSD which can be found under the /vmfs/devices/disks directory.
ls -lh /vmfs/devices/disks
total 1985717835
-rw