# Optical Disc Filesystem ## Identification [[Western Digital My Cloud EX4|My Cloud EX4]] is a multi-bay NAS appliance. Multiple usernames indicate local/share identities. [[Universal Disk Format|Universal Disk Format]] is the standardized filesystem family used on optical media, including DVD and Blu-ray variants; it is not an Apple-proprietary filesystem despite the source prefix `apple UDF`. ## Notebook evidence - [[Scanned_20260730-1659#PDF page 10 — Western Digital My Cloud credentials and UDF|PDF page 10: Western Digital My Cloud credentials and UDF]] — The Western Digital My Cloud EX4 was a network-attached storage appliance, and the page records multiple local identities against it. The appended UDF expansion is technically separate: Universal Disk Format is the optical-media filesystem standardized for DVDs and Blu-ray; Blu-ray ROM2 explicitly adopted UDF 2.5. The juxtaposition may reflect storage-format research migrating from NAS recovery into optical/archive compatibility. ## Relationships and overlays The source places this record in an evidence cluster with [[Network-attached Storage|Network-attached Storage]] · [[Universal Disk Format|Universal Disk Format]] · [[Western Digital My Cloud EX4|Western Digital My Cloud EX4]]. The occurrence contributes to the notebook's larger model of [[Identity Continuity|identity continuity]], [[Device Sovereignty|device sovereignty]], and [[Continuity Architecture|continuity architecture]]. ## Evidentiary status and open leads Determine whether `192 MCWD` refers to a local IP suffix, device label, or network segment; inventory the exact My Cloud EX4 hardware. ## Source - [[Scanned_20260730-1659|Scanned_20260730-1659]]