DSM says there is insufficient system capacity for an update, but my volume has free space. Why?

Applies to: Synology DSM system/package/drive-firmware update errors that explicitly mention system capacity.

Work through these checks

1. Save the exact error. Note whether the failed operation is a DSM, package or drive-firmware update. Record the model and installed version so an unrelated volume-space problem is not mistaken for this error.
2. Check system and storage health. Review Storage Manager and DSM notifications. If a storage pool is degraded or the NAS is behaving abnormally, protect the files before retrying maintenance.
3. Use the supported update path. Confirm the update is intended for the exact model and current version. Back up configuration and important data, then follow the model-specific capacity guidance or obtain a diagnostic review.
4. Escalate a repeated capacity error. Provide the update name, error and recent changes. Keep ordinary data-volume cleanup separate from system-partition repair.

Confirm the result

The supported update completes and the reported installed version changes correctly, with storage and services remaining healthy.

If you need help

Include these details in your ticket: NAS model, DSM version, update type and exact capacity message. Send diagnostic logs privately if requested.

Related guidance: Why is my Synology volume still full after I delete files?

Updated 261110