If you are unable to expand a VMware ESXi disk and find that the option to expand the disk is greyed out, then it’s probably because:
- The VM is powered on
- There are snapshots of the VM
- The VMware disk is IDE emulated, instead of SCSI emulated
Once the VM is powered off, snapshots are deleted and the disk is presented as a SCSI disk within VMware, the option to expand the disk should no longer be greyed out.