What is this 32MB Unallocated Space? 256GB SanDisk Extreme PRO USB 3.1

ok guys the 32 unallocated space is created by a proprietery formatiing softwar used by the compagny ( my best guess) as I have replicated the the format even after i have alllocated the 32 to the rest. and NO your  SD is not used. as some of the disk are formated that way. as one of the users were saying earlier the unallocated space might be used for speed. I AM NO SANDISK STAFF. just a user who is doing some digging.