If you have a working computer and just want to "reclaim" missing space: Overview of Disk Management | Microsoft Learn
In storage terms, is a range of sectors on a physical drive that are not yet assigned to a partition. disk 0 unallocated
But it is also a reminder: a partition table is one of the most fragile yet critical structures on a drive. Treat it with respect, keep backups, and know that unallocated space is not a void — it’s a story waiting to be rewritten. If you have a working computer and just