Ther can only be one Extended Partition per hard drive
Primary partitions are the main divisions of a hard drive that can directly contain operating systems, allowing the system to boot from them. A hard drive can have up to four primary partitions. In contrast, secondary partitions (often called logical partitions) are created within an extended partition and are used to organize data without the limitation of the four-partition rule. Secondary partitions cannot be used to boot an operating system directly.
four primary
A hard drive. Physically it is a single unit (but may have more than one surface or platter to store data). The drive has a 'reference' track - which tells the computer how the drive is divided. You can split a hard-drive into multiple partitions to separate different types of data.
Hard drive partitions that are accessed directly by the operating system are typically referred to as "primary partitions." These partitions can contain a file system and are directly addressable by the OS, allowing it to read and write data. In contrast, logical partitions, which reside within an extended partition, are accessed through the primary partition.
On MBR partitioned hard-drives only 4 primary partition can be created. (Use extended and logical partitions to create more partitions).
IDE (Integrated Drive Electronics) can support a maximum of four primary partitions on a single hard drive. Alternatively, one of these primary partitions can be configured as an extended partition, which can contain multiple logical drives. This allows for a total of up to three primary partitions and potentially many logical drives within the extended partition.
Partitions divide hard drive space.
Disk Druid Partitions is a program that partitions your hard drive for you.
You do it by creating partitions on your hard drives. Partitions are typically created before the hard drive is formatted. Another option is to use a program like Partition Magic to edit partitions on your hard drive. You generally don't want to play around with your partitions too much after you have your OS up and running. Any error may cause you to have to reinstall everything.
creates partitions on the hard drive
A hard drive can have multiple volumes. The number of volumes that can be created on a hard drive depends on the operating system and the partitioning scheme being used. Typically, a hard drive can have several partitions or volumes.
Partitions are not something that are the same from drive to drive, or from computer to computer. Partitions are created by the user from unused hard drive space, and have no set size, although there is a relatively small minimum. This means that even one one disk, a user can create literally dozens, if not hundreds.