Is there any way to do this besides formatting the disk and recreating the partitions with 1mb unallocated? Microsoft just says you have to have it. They don't say what you have to do if you don't have that space available.
Any disks to be upgraded must contain at least 1 megabyte (MB) of "free" space at the "end" of the disk for the upgrade to succeed. Disk Management automatically reserves this free space when creating partitions or volumes on a disk, but disks with partitions or volumes created by other operating systems might not have this free space available.
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