hard drive – How to determine wasted space by large block size on macOS RAID array?

Working on a system that was created with a macOS RAID array with 256k block size for the members. The drive was originally to be used for video and image editing and storage, but has now become a multipurpose drive that has a lot of smaller files on it. How can I determine the amount of wasted space on the drive that might be caused by this large block size?

If it is too considerable I believe I’ll move these files to another drive and recreate the array with smaller block size commensurate with the usage now.