Linstation Quad LS-QVL firmware 1.64 had bug
I am not able to delete Array2, all of the button will gray-out if I clicked Array2
And I am also Unable to create another RAID 1, The "CREATE RAID1" button is gray-out too....
Btw, this product is selling on the market for years and serious bugs still not fixed.
Please advice,
Thanks

That is really sucks, the data are likely corrupted after I use the check disk function.
The amount used of space drop from 96.6% to 74.3%.

doesn't look like a bug or we would have seen this before, this looks like disk check found an issue with a HDD or system or correct the amount of space actually being used - did you check to see if any files are corrupt? - have you called support to get help with this?