http://blog.colovirt.com/ has a nice write up on running ESXi via booting from USB 2.0 USB Stick, titled : VMware/Linux/ESXi: Running ESX4i From Bootable USB
I like running ESXi via booting from USB 2.0 memory sticks. This makes it that much easier for my home lab. Especially since I mainly use ISCSI VMFS datastores. Not to mention that “in a pinch”, having ESXi on memory sticks can aide in disaster recovery (DR) scenarios for small businesses. Of course the requirement here is that the server MUST be able to boot from USB! Also, get a big memory stick. Each time an upgrade is performed to ESXi, the version being upgraded from is still stored on the memory stick in case a “roll back” is needed. At least this is my understanding. Larger memory sticks are pretty cheap now. Below outlines the steps to creating a bootable ESX4i memory stick. The main reason for me writing this up is that the process turns out to be different from ESX3i.
Check out the full post http://blog.colovirt.com/2009/06/01/vmwarelinuxesxi-running-esx4i-from-bootable-usb/
Thanks to the Author.