# Check whether a UniFi NVR RAID transition requires reformatting

> Match the exact model, drive count, and target layout to the vendor’s reformatting table before changing RAID.

- Canonical URL: https://update.dsesecurity.com/updates/check-whether-a-unifi-nvr-raid-transition-requires-reformatting/
- Publisher: Detection Systems & Engineering (DSE Security)
- Author: DSE Security Editorial Team
- Published: 2026-10-15T13:32:18+00:00
- Modified: 2026-10-15T13:36:14+00:00
- Last reviewed by DSE: 2026-10-15
- Resource type: Guide
- DSE priority: Information
- Topics: Video Surveillance
- Reading time: 2 minutes

## What you need to know

Match the exact model, drive count, and target layout to the vendor’s reformatting table before changing RAID.

## Potentially affected

Applies to the UNVR/ENVR transition tables in the current UniFi storage guide, with the ENVR examples stated above. Do not apply those examples to UNAS, ENAS, or a different drive layout.

## DSE recommendation

DSE recommends checking the exact transition row before approving a storage-protection change.

## Article

Match the exact model, drive count, and target layout to the vendor’s reformatting table before changing RAID.

## Source facts

UniFi’s storage guide distinguishes RAID transitions by recorder model, current layout, drive count, and target layout. Its ENVR table shows that adding a hot spare to a full 16-drive RAID 5/6 configuration requires reformatting, while the listed one-to-fifteen-drive transition does not. The same table marks transitions from RAID 5/6, with or without a hot spare, to RAID 10 as requiring reformatting. For existing NVR arrays, adding or replacing drives triggers a rebuild and can temporarily affect performance.

Source: [Ubiquiti Help Center — Storage Protection and Data Redundancy in UniFi (RAID)](https://help.ui.com/hc/en-us/articles/12395353544727-Storage-Protection-and-Data-Redundancy-in-UniFi-RAID).

## Applicability

Applies to the UNVR/ENVR transition tables in the current UniFi storage guide, with the ENVR examples stated above. Do not apply those examples to UNAS, ENAS, or a different drive layout.

## DSE recommendation

DSE recommends checking the exact transition row before approving a storage-protection change. Record the model, bay occupancy, current RAID state, desired target, and whether the vendor marks it destructive. Preserve required footage and configurations independently before any reformatting path. Plan a maintenance window and acceptance criteria for the rebuilt system. Avoid treating an apparently empty usable-capacity display or a hot-spare label as permission to improvise a different disk sequence.

## Verification

Have a second qualified reviewer compare the planned operation with the current model-specific table. After the approved change, inspect array state, camera recording, playback, and actual usable capacity. Record completion of rebuild and preservation checks; do not claim that changing RAID protection replaces the need for a separate recoverable evidence copy.

## Official reference

[Ubiquiti Help Center — Storage Protection and Data Redundancy in UniFi (RAID)](https://help.ui.com/hc/en-us/articles/12395353544727-Storage-Protection-and-Data-Redundancy-in-UniFi-RAID). Reviewed October 15, 2026.

## Primary reference

- Name: Ubiquiti Help Center — Storage Protection and Data Redundancy in UniFi (RAID)
- Authority: help.ui.com
- URL: https://help.ui.com/hc/en-us/articles/12395353544727-Storage-Protection-and-Data-Redundancy-in-UniFi-RAID
- Source publication date: Not stated by the source

## Citation and use

Preferred citation: “Check whether a UniFi NVR RAID transition requires reformatting,” DSE Security, https://update.dsesecurity.com/updates/check-whether-a-unifi-nvr-raid-transition-requires-reformatting/
Publishing principles: https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/
Usage and citation policy: https://update.dsesecurity.com/usage/
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