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When I use Synology RAID calculator it shows I should get 26TB of storage space, but my Synology NAS only shows 23.6TB.


Why Storage Pool not using all available space? The storage pool shows less available space than there is.

How do I find the actual hard drive size?
The hard drive capacity calculation method of Manufacturer is: 120GB=120,000MB=120,000,000KB=120,000,000,000 bytes; while the hard drive capacity calculation method of is: 120,000,000,000 bytes/1024=117,187,500KB/1024=114, 440.9MB/1024=111.8GB.

This calculator should help http://www.endmemo.com/data/diskcapacity.php
I added new drives to my Synology NAS, but the available capacity didn’t increase. What can I do? Storage pool shows 23.6TB but Volume capacity is only 15.9TB

By default, Synology do not increase volume size when you introduce new drives. They think you may want to create a second volume/partition.
To change volume capacity to MAX, do these steps:
For DSM 7.0 and above
- Go to Storage Manager > Storage.

- Select the volume you want to expand and click its upper-right
icon. - Select Settings from the drop-down menu.

- Go to the Modify Size section. Do either of the following:
- Enter a new volume size in the Modify allocated size (GB) field.
- Click the Max button if you want the volume to have all the allocatable capacity.

- Click Save.1
For DSM 6.2 and below
- Go to Storage Manager > Volume.
- Select the volume you want to expand.
- Click the Action button.
- Go to Configure > General. Do either of the following:
- Enter a new volume size in the Modify allocated size (GB) field.
- Click the Max button if you want the volume to have all the allocatable capacity.
- Click OK.1
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