Product : VMware, vSphere/6.5, vSphere Standard
Feature : Virtual Disk Format, Storage, Network and Storage
Content Owner:  Roman Macek
Summary
vmdk, raw disk (RDM)
Details
VMware Virtual Machine Disk Format (vmdk) and RAW Disk Mapping (RDM) - essentially a raw disk mapped to a proxy (making it appear like a VMFS file system)