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In brief
A NAS (Network Attached Storage) is a data storage device that is connected directly to the network and provides files for multiple users and devices. It contains one or more hard drives or SSDs, usually combined into a RAID, and its own operating system. During decommissioning, a NAS is easily overlooked, even though it often holds backups, project folders and personal data.
NAS, SAN and server compared
| System | Access | Typical use |
|---|---|---|
| NAS | At file level over the network | File storage, backups, small and medium-sized companies |
| SAN | At block level over a dedicated storage network | Databases, virtualization, data centers |
| File server | Via a full-fledged server with shares | Flexible, often with additional services |
What to note when retiring devices
- Record all drives: Im RAID array each drive contains data fragments. Each needs its own proof.
- Additional storage: Some systems use SSD caches or internal storage for configuration and logs.
- Credentials: Remove passwords, certificates and cloud links stored on the NAS beforehand.
- External backups: Do not forget connected USB hard drives.
The drives are erased like other HDDs and SSDs or destroyed if defective. How the teardown of larger systems works is described in the guide Selling Used Servers and Dismantling a Data Center. Second IT erases every drive with Blancco, records it by serial number and issues an erasure certificate.
Frequently asked questions about NAS
Is it enough to reset the NAS to factory settings?
No. This often only removes the configuration and directories. The data on the drives can possibly be recovered.
Do I have to remove the hard drives before handover?
Not necessarily. What matters is that all drives are listed with their serial number in the device list and are erased or destroyed individually.
What is the difference between a NAS and an external hard drive?
An external hard drive is attached to one computer. A NAS is a standalone device on the network that many users access.
What is the difference between a NAS and a SAN?
A NAS provides files at file level over the network and serves as file storage or backup storage. A SAN accesses at block level over a dedicated storage network and is used for databases, virtualization and in data centers.
Does every hard drive in a NAS RAID contain data?
Yes. In a RAID array, every drive contains data fragments. That is why every drive needs its own erasure and its own proof. You should also not forget SSD caches and internal storage for configuration and logs.
Decommission network storage – every drive erased and documented.
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