In many computers, all space will be allocated to partitions. How to create unallocated space on Windows 11, 10, 8, 7 And the destination SSD or HDD must have unallocated disk space. ✦ Migrate OS to SSD: It is the function that transfers/clones system drive from an old HDD to a new SSD or HDD. In the process of operating, this wizard requires the destination location must be unallocated disk space. ✦ Clone Partition: It is a function that copy all data and files from one partition to another partition. In general, there are two operations that require an unallocated space: For example, extend C drive, format partition, delete partition, clone partition/disk, migrate OS to SSD, convert MBR to GPT, free up space, etc. This is a very professional disk partition management expert, it can solve different issues to your disk.

When you use AOMEI Partition Assistant, some operations require that there must be some unallocated space on the destination hard drive.

It does not allow any program or data to be written to it until it is created as a partition. Unallocated space is disk space that does not belong to any partition. When will you see the unallocated space message?

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