The selected GPT formatted disk contains a partition which is not of type PARTITION_BASIC_DATA_GUID This is reported mostly when the user is trying to extend a specific disk-partition.

If Windows Setup displays We couldn't create a new partition error 0x9cfc7550 when installing Windows 11/10, here's what you need to do.

Cedric Crawley wants to keep Windows 7 and his applications in one partition, and his data in another. Creating a separate data partition protects both your system and your data.