What is the minimum percentage of spare disks in a disk group? 12/18/2019 – by Mod_GuideK 0 What is the minimum percentage of spare disks in a disk group? A. 10% B. 15% C. 20% D. 25% SHOW ANSWERSCorrect Answer: A Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.