Western Digital Purple 4TB

Part number WD40EJRX · 3.5" SATA HDD · Surveillance class · up to 4 TB

This drive is on Synology's official compatibility list for 56 machines (list read 2026-10-28). If your model is below, the drive is officially listed — not an unofficial workaround.

Compatible Synology models

Click any model for its full compatibility list and pick guidance.