TerraMaster Official Forum

Hi,
I am using TOS 5.1 on F5-211. I've just inserted one WD Ultrastar HC550 18TB into it and initialized the NAS. I picked the BTRFS format and TRAID for the disk. After the initialization process, the usable space is only 16TB and wasted 2TB.
I wonder if I insert another disk into the NAS later (18TB or 16TB) when I could afford, could I take back that wasted 2TB above and use the space more effectively?
Thank you so much!
Galni

@TMroy
Here is the storage pool screenshot:

Check this guide please: viewtopic.php?f=79&t=2815

[at=TMroy post_id=24017 time=1674027932 user_id=1656][/at]

Thank you so much for the guide. It helps answer my question.