NAS Failure: The Storage Won't Open, Shared Folders Have Vanished or the Device Wants to "Initialise the Disks" — What Happened, What You Must Never Do and How to Get the Data Back

Network-attached storage, or NAS, is a small computer with one or more drives that connects to the network and shares folders. In offices it holds documents, 1C databases, scans and projects; at home, photo and video archives, computer backups and films. For months and years a NAS works unnoticed, until one morning the shared folders won't open, the lights turn red, the device starts beeping, and the web interface offers to "initialise the disks" or "create a new volume". At that moment it's very easy to take a step after which the data can't be recovered. Let's look at what's happening and how to act.

Common causes of failure

• One or more drives failing. In a single-drive NAS, its failure makes all the data inaccessible. In arrays, the problem comes when more drives fail than the configuration can tolerate, or one drive died long ago and a second followed.
• The power supply or NAS board failing. The drives are often healthy and the data intact, but it has to be read outside the device or on an identical one.
• A failed firmware update. An unsuccessful update, or a power cut during one, can leave the NAS unusable or damage its system partitions.
• A sudden power cut without a UPS — damaging the volume's file system.
• Ransomware. Some viruses specifically target NAS devices through firmware vulnerabilities and internet access, and others encrypt network folders from infected computers.
• Lost access. A forgotten admin password, a departed employee who set everything up, changed network settings.

What not to do

• Don't click "Initialise", "Create volume" or "Restore factory settings" with data deletion. These actions overwrite the storage structure and can make recovery impossible.
• Don't swap or replace drives at random. In an array the drive order matters, and inserting a new drive starts a rebuild that, in the wrong situation, will wipe the data.
• Don't start an array rebuild unless you're sure which drive is healthy and which isn't.
• Don't connect NAS drives to a Windows computer — the system may offer to format or "repair" them.
• Don't keep switching the NAS on and off if it clicks, beeps or makes strange noises.

What you should do

Shut the NAS down properly if you can, or disconnect the power. Photograph the web interface screen with the error messages, if it's accessible. Number the drives in the order they sit in the bays — this is critical for arrays. Recall what preceded the failure: an update, a power cut, a storm, a drive replacement, suspicious files on the computers. Then contact data recovery specialists.

How data is recovered from a NAS

Most NAS devices use storage technologies standard in Linux: software arrays and file systems that Windows doesn't understand. So recovery starts by making sector-by-sector images of each drive. If a drive is physically damaged, it's imaged in lab conditions. The array is then assembled virtually from the images, its configuration, drive order and parameters are determined, and the file system is read with specialised tools. The original drives are never altered, so different approaches can be tried without risk.

How to stop it happening again

• A NAS is storage, not a backup. Important data must also be copied to a separate medium or the cloud.
• Drive health alerts must reach a responsible person.
• A UPS protects against damage during power cuts.
• Firmware should be kept up to date, and internet access closed off or secured.
• The admin password and setup details should be written down and kept by the manager.
• Drives should be replaced proactively, based on age and monitoring data.

What our technician does

1. Finds out the NAS model, configuration, the history of the failure and what's already been tried.
2. Diagnoses the drives and the device and determines the cause of failure.
3. Images every drive — in the lab if there's physical damage.
4. Assembles the array virtually from the images and extracts the data.
5. Restores the NAS to working order or helps replace it, and sets up backups.

A real example

A design studio by Lisi Lake kept all its projects on a two-drive NAS. After a power cut the device stopped opening, and the web interface offered to create a new volume. An employee had almost clicked the button but decided to call us. Diagnostics showed that one drive had been faulty for a long time, and the file system on the second had been damaged by the power cut. We imaged both drives, assembled the array and recovered every project. The studio got new drives, a UPS, drive health alerts and a weekly backup of its projects to the cloud.

A word on single-drive NAS units and "personal cloud" home storage. Many people buy them as a family backup, but in practice they become the only place the photo archive lives. If that drive fails, recovery is possible, but it costs more and takes longer than a second drive for a copy would have. So even at home, a NAS archive should be duplicated to an external drive or the cloud.

Call a technician

If your NAS won't open or is asking to be initialised, don't click anything — get in touch and we'll help in any district of Tbilisi around the clock. Learn more on our data recovery, hard drive recovery and local network setup pages.