Product : Pivot3, Acuity [HCI]/10.6.1, Datacenter
Feature : Hypervisor OS Layer, General, Storage Support
Content Owner:  Herman Rutten
Summary
USB, SSD, SD
Details
Dell: ESXi is booted from an internal, enterprise grade M.2 SSD drive or from dual SDs.

Lenovo: ESXi is booted from an internal, ultra-high performance, enterprise grade USB drive.