You can split, merge, and otherwise manage your partitions in Windows via the Disk Management tool.
Your Windows PC may have come with one hard drive and partition or it may have come with a couple of drives and partitions. No matter the original configuration, you may want to manage and modify your disk drive arrangement. Maybe you’d like to create an extra partition to install and run another operating system. Perhaps you want two partitions to separate your personal files from your Windows system files. Or maybe you already have two partitions and now want to remove one of them. You can do all this through the built-in Windows Disk Management tool. Available in all the current and most of the past versions of Windows, Disk Management lets you shrink, create, and delete your partitions.
You already know a hard disk is a single physical drive: it’s either a conventional mechanical drive that magnetically stores your data on platters, or a solid-state drive that houses your data on flash memory chips. Computers usually come with a single hard drive, though you can always add a second one. Most vendors offer an option to outfit a desktop with two mechanical drives or an SSD as your primary drive and a mechanical one as your secondary drive.
A hard drive must be organized into at least one segment, or partition, so the operating system will recognize it and can use it to store data. A hard drive on a new computer is automatically formatted with one partition for the OS. The vendor may also allocate one partition as a recovery partition, which can be used to restore your operating system in the event of a problem.
A partition can be primary, extended, or logical. You’re typically limited to four primary partitions. Depending on how your hard drive is structured, the fourth partition can be set up as an extended partition to house multiple logical partitions. But Windows can run only from a primary partition.