If you intend to create two partitions (i.e. a root and a swap partition) you will need to reduce the size to allow for creating the second partition.
Ọ bụrụ na ịchọrọ ịmepụta akụkụ abụọ (ya bụ mgbọrọgwụ na nkewa swap) ọ ga-adị mkpa iji belata nha iji kwe ka ịmepụta akụkụ nke abụọ.