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Synology troubleshooting — common problems, fixed

Answers to the most common Synology NAS problems and error messages, sourced from 20 years of community solutions and the official docs. Pick your issue, or ask the AI your exact question.

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Storage

Synology 'System Partition Failed' — how to fixSynology Btrfs vs ext4 — which to chooseSynology drive with bad sectors / Critical statusSynology not recognizing a hard driveSynology out of space — how to free it upSynology storage pool degraded — what to doSynology volume crashed — how to recover your dataSynology volume is read-only — how to fix

Backup

Synology Active Backup for Business keeps failingSynology Cloud Sync stopped syncingSynology Hyper Backup failed or stuck

Network

Can't connect to Synology remotelySynology DDNS error / not updatingSynology QuickConnect not workingSynology slow file transfer speeds

System

Forgot Synology admin password — how to resetHow to reset a Synology NAS (Mode 1 vs Mode 2)Locked out of Synology 2-step verificationMigrate to a new Synology and keep your dataSynology DSM update failed or stuckSynology status 'Migratable' — what it means

Apps

Plex hardware transcoding on SynologyRunning Docker / Container Manager on SynologySynology Drive client not syncingSynology Photos not showing photos / thumbnailsSynology Surveillance Station camera licenses

Hardware

Synology 'found no hard disk' at startupSynology NAS overheating — how to cool it downSynology beeping continuously — what it meansSynology fan error alert but fan is spinningSynology fan running loud / at full speedSynology won't boot — blue light blinking

Performance

Synology high CPU / memory usage