The ESXi installer must be accessible to the system on which you are installing ESXi.

The following boot media are supported for the ESXi installer:

Boot from a CD/DVD. See Download and Burn the ESXi Installer ISO Image to a CD or DVD.

Boot from a USB flash drive. See Format a USB Flash Drive to Boot the ESXi Installation or Upgrade.

PXE boot from the network. PXE Booting the ESXi Installer

Boot from a remote location using a remote management application. See Using Remote Management Applications