How to replace a failing drive on Synology NAS

[Windows Central]

Even the best NAS drives won't last forever and when one eventually fails inside your Synology network-attached storage (NAS) enclosure, you'll need to replace it to repair the volume and resume normal operations. This guide will show you how to quickly achieve this without losing data.
[h=2]How to replace a Synology NAS drive[/h]We're going to run through steps to identify the failing drive, replace it with a new one, and repair the volume to keep your NAS running good as new. It's easy to know when you have a drive-related problem as the NAS should either beep out loud and/or display messages in the notification area.

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