You replaced a 4 TB drive in your Synology SHR array with an 8 TB drive. The rebuild started, ran for a while — and then stopped. DSM shows Degraded, Crashed, or the progress bar has not moved in hours. The NAS may have become unresponsive entirely. This article covers data recovery after an SHR rebuild crash: what actually happened inside the array, how to read the current state without making it worse, and how to get your files back.
The NAS is dead. The drives are intact. You connect them to a Windows or Linux machine and either see a "You need to format this disk" prompt, or the drives are not visible at all. This is not data loss — it is an access problem. Unlike scenarios where the drives themselves fail, a dead Synology motherboard leaves the SHR volume data physically untouched. What you need to recover is not the data itself, but access to the multi-layered structure Synology uses to store it.
The disk is physically present, SMART shows no errors, and the Unraid array started without issue — but one share is gone and the WebGUI shows the disk as Unmountable. This is a filesystem corruption event, and it is a different class of problem from a hardware failure.
A single disk failure in an Unraid array is a predictable, manageable event — provided you respond to it correctly. The system keeps running, your data remains accessible, and there is a defined path to full recovery. None of this is accidental. It follows directly from how Unraid structures its arrays.
This article covers the mechanics behind that protection, the correct procedure for replacing a failed drive, and what to do when the standard path doesn't work and data needs to be extracted from the outside.
When someone contacts a data recovery specialist about a failed array, the answer to "which RAID level is it?" shapes everything that follows. RAIDZ1 and RAID 5 share the same fundamental idea — distribute parity across disks so any single drive can be lost without data loss — but they behave quite differently under stress. Those differences become very concrete once you're staring at a degraded array. This article focuses on what the architectural differences mean for failure probability, recovery difficulty, and which tools actually work in each case.
In the world of distributed data storage on NAS devices such as Synology, QNAP, ASUSTOR, Western Digital, Thecus, TerraMaster, Buffalo and others, information recovery has become an integral part of security. This article brings together methods for recovering data from RAID NAS devices, including drive failure scenarios and simple file recovery without removing drives.
Which NAS operating system is better - Synology DSM or QNAP QTS? Both operating systems come with ready-made NAS devices from their manufacturers, Synology and QNAP, respectively. Let's compare these two operating systems - what they represent in general, and what possibilities they can offer for data storage.
OpenMediaVault (OMV) is a specialized operating system for independently assembled NAS storages. It is based on Debian Linux, one of the popular operating systems, and provides software for creating data storage based on various hard drive arrays. So, how can you recover data from a NAS storage created in OpenMediaVault?
