Adding a vdisk created in Workstation to an ESXi host

You can't just copy the disk into the ESXi datastore and hope it works,it won't, it needs converting:

1. Open up an SSH session to the ESXi Host
2. Run the following:
   
   vmkfstools -i HostedVirtualDisk ESXVirtualDisk
   
   Where HostedVirtualDisk is the path to the vmdk on the host and ESXVirtualDisk is the vmdk to be output by the command.
   
   For example:
   
   vmkfstools -i /vmfs/volumes/datastore1/virtual_machine_folder/ virtual_machine.vmdk /vmfs/volumes/datastore1/new_virtual_machine_folder/ virtual_machine.vmdk
3. Mount the new vmdk once the conversion is complete