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The Synology D4ES02-4G is a 4GB DDR4 ECC SO-DIMM memory module built for use in compatible Synology NAS devices. ECC memory detects and corrects single-bit errors, providing improved data integrity and system stability during continuous operation — especially important for virtualization, backups, and multi-user workloads. This module is tested and validated by Synology to ensure compatibility and stable performance in supported NAS models.
