usb-drive-not-detected Troubleshooting

USB drive not detected on the Synology DS923+

Source: Synology Knowledge Center — error codes Confidence: 80% Verified Aug 9, 2026

An external USB drive is not detected by the NAS.

How to fix USB drive not detected

Reconnect the drive

Unplug and reconnect the USB drive, and try a different port.

Source: Synology Knowledge Center — error codes Confidence: 80% Verified Aug 9, 2026

Difficulty: ★ Est. 3 min

Check the format

Ensure the drive is formatted in a compatible filesystem.

Source: Synology Knowledge Center — error codes Confidence: 80% Verified Aug 9, 2026

Difficulty: ★ Est. 5 min

Replacement parts for the Synology DS923+

Synology DS923+ NAS Drive Synology DS923+ SSD Cache Synology DS923+ RAM Module Synology DS923+ Power Supply Synology DS923+ Drive Caddy Synology DS220+ NAS Drive Synology DS220+ SSD Cache Synology DS220+ RAM Module Synology DS1522+ NAS Drive Synology DS1522+ SSD Cache Synology DS1522+ RAM Module

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