The reason why the notebook Win7 system partition error can not create a disk partition and its solution

            First, the reason analysis:
Since the main partition has reached 3, and the extended partition has been established, in this case, the user will continue to divide, it will report an error.
Second, the solution:
can be divided into four primary partitions or three primary partitions + 1 extended partition (multiple logical partitions can be created in the extended partition), that is, 3 primary partitions + 1 extended partition .
1. If win7 system has 100MB boot partition + system partition + hidden partition, these three partitions belong to the main partition, so you need to divide all the remaining space into the extended partition to be able to partition smoothly;
2 The win7 system divides the primary partition by default. When the fourth partition is divided, the system automatically assigns the fourth partition to the extended partition without specifying the partition type.
3. The partition can only be divided during the installation process. Up to 4 partitions, that is, the primary partition, the extended partition can only be created under the system;
4. If the following situation occurs, the detailed steps are: first delete the D drive, then right click to delete the extended partition (green part), After deletion, it will be merged with the previous undivided space, and then a new simple volume will be created. The system automatically divides the extended partition and the logical partition. When partitioning, the size can be set, and the remaining space can continue to be divided.
First, the cause analysis: