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Say you have a raid5 volume of 3×500GB disks with an effective space of ~1TB.
You plug out 1 disk, swap it with a 1TB disk and let the areca rebuild the array.
You do the same for disk 2 and 3.
You’d probably think you’ll have an extra TB to use. But the areca won’t show you. Here’s how (undocumented feature):

1. Login the browser management console (Raidset Functions > Rescue RaidSet)
2. Enter the keyword “RESETCAPACITY Raid Set # 000”, confirm and submit. After that, controller will reconfigure the raidset capacity.
3. Create an extra logical drive on the raidset