You can easily utilize the old Post:
http://www.alessandromazzanti.com/2012/06/vmware-installare-vmware-esxi-50-su-una.html
The only differences are that you must change the following setting (after USB Vmware Boot)
Changing value:
Example: [nas] LOGS/Server_Vmware
The relative warning will disappear:
[original article http://nolabnoparty.com/installare-vmware-esxi-5-5-chiavetta-usb/?utm_source=feedly]
