title: How to Upgrade Synology 2-Bay NAS Storage to Larger Capacity?
body: <p>First I'd like to apologize for the long read.</p>
  <p>I hope you can help me with this one. I have a 2-bay NAS (DS218+). I initially have a single 4TB (WD Red NAS Drive) drive (SHR - without data protection) and multivolume support was flagged as No. I decided to upgrade my storage capacity so I bought a new 8TB WD Red NAS Drive.</p>
  <p>I've been reading the knowledgebase but still reluctant to proceed as I'm still quite confused if I'm doing the correct procedure. What I want to achieve is to upgrade my storage without data loss to 8TB (without data protection in mind yet). <strong>Lets just say I want to replace my 4TB to 8TB like nothing happened.</strong></p>
  <p>The current version of my DSM is 6.2.3. In my 1st bay is the 4TB. I attached the 8TB to the 2nd bay and saw the drive recognized and &quot;Not Initialized&quot; as expected. Now, the videos I've seen always mention a <strong>Manage</strong> button, but in my case I can't find it. And it didn't ask me to repair anything nor there was a &quot;Degrade&quot; status.</p>
  <p>I only see <strong>Add Drive</strong> when I go to <strong>Storage Pool</strong> -&gt; <strong>Action</strong> however. I went with it and clicked Next, then had a pop up warning me that the data in the newly added drive will be erased, I clicked OK and this was displayed:</p>
  <p><a href="https://i.stack.imgur.com/Q0gvE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Q0gvE.png" alt="enter image description here" /></a></p>
  <p>Now, the <strong>Total Capacity: 3.63TB</strong> is what got me bummed. I'm new to Raid stuff so I'm still quite confused. I'm hoping to get a new max capacity of 7.2TB from my new 8TB. How do I do this without losing data? And my system as-is?</p>
  <p>I hope you can guide me. I'd really appreciate it.</p>
  <p>Thank you so much in advance.</p>