Unable to create a new volume in this allocation space

        WIN7 system, when creating a partition under the system, prompts "Cannot create a new volume in this allocation space because the disk already contains the maximum number of partitions." How to deal with it? Analysis shows that the general user machine prompts this error, the primary partition has reached 3, and the extended partition has been established, and then continue to divide this will appear this error. Solution partitioning rules: You can divide four primary partitions or three primary partitions and one extended partition (there can be multiple logical partitions in the extended partition). The following figure shows three primary partitions and one extended partition. 1.win7 system, normal already has 100MB boot partition + system partition + hidden partition, these three partitions belong to the primary partition, so all the remaining space must be allocated to the extended partition (system automatically established) to be able to partition smoothly. 2.win7 system, the system defaults to the primary partition, when the fourth partition is divided, the system will automatically assign the fourth partition to the extended partition, which means that there is no need to specify the partition type. 3. During the process of installing the system, the partition can only be divided into up to 4 partitions, that is, it is the primary partition. The extended partition can only be created under the system. 4. If the following situation occurs (the black part in the figure cannot be divided), the detailed steps are resolved. The illustration is as follows: a. Delete the D drive b. Delete the extended partition (green part), right click to continue deleting, delete will be merged with the previous undivided space c. Create a simple volume, the system automatically divides the extended partition and Logical partition, you can set the size when partitioning, the remaining space can continue to be divided. Note: Please backup important data before operation. Other related tutorials:

There are three types of hard disk partitions, the primary disk partition, the extended disk partition, and the logical partition.

A hard disk has at least one primary partition, at most four, and the extended partition can be no, at most one. And the main partition + extended partition can not exceed 4 in total. There can be several logical partitions. The active primary partition is the boot partition of the hard disk. It is independent and the first partition of the hard disk. If it is normal, it is the C drive.

After the main partition is separated, the rest can be divided into extended partitions. Generally, the remaining parts are all divided into extended partitions, or they may not be fully divided, and the remaining parts are wasted. However, extended partitions cannot be used directly. They are used in a logical partition, so the extended partition can be divided into logical partitions. Their relationship is a contained relationship, and all logical partitions are part of an extended partition.

You can open the disk management to see if your situation is likely because there are already 4 primary partitions. (Logical partitions together count an extended partition, also a primary partition). Because ThinkPad has a hidden partition, plus the C drive where the system is located, there are already two primary partitions. If there are more primary partitions, the partition will fail.

The solution is to back up the important data of other disks except the C drive, then delete the redundant primary partitions in the disk management and merge them into a large unallocated space. Create an extended partition and build a logical partition in it to separate the structure you want.