Zend certified PHP/Magento developer

Spanned Drive – Removal

I currently have 3 drives as dynamic drives spanned to create 1 volumne

Currently the drives equate to approx 30tb (10,10,12)

If i was to shrink the volume by 12tb.

Can i then remove the 12TB from the spanned volume? making it a free single disk.

Whilst also NOT losing any data that currrently remains on the spanned volume (which would then be the 10 & 10)