Problem when expanding SHR Volume.

Hi guys.

I have a synology DS413.

I started out with a 3TB drive and expanded it with another drive which went flawlessly.

This week I acquired 2 more 3TB drives. Popped them in and tried expanding the volume. While expanding the volume something seemingly went wrong and the diskstation froze, I lost access to DSM so I restarted it.

After restarting, the diskstation started doing a parity check on disks 1,2 and 3 but for some reason not 4. Disk 4 was showing as un-initialized.

After the parity check was complete it's showing the volume as degraded and telling me to repair the volume by adding the 4th disk.

Before trying this I decided to do an extended SMART test on the new disks.
Disk 3 turned out fine but disk 4 is full of bad sectors so I am returning it.


So that's the back story.

Here's my actual problem.

The only option the storage manager is giving me right now is to either add a 4th drive or delete the volume. It is not currently using the added space given by the 3rd drive.

Here's a screenshot to better illustrate what I'm talking about



So, while I'm waiting for the 4th disk, how can I repair the volume to correctly utilize all 3 disks?