![]() If there is no primary partition, you can convert logical partition and mark the primary partition as active. To fix it, I recommend you AOMEI Partition Assistant. In Disk Management,if there is no primary partition or already has an active partition, you will find you cannot mark partition as active on Windows 10/8/7. You can clearly see from above, only one primary partition can be set as active. ![]() If you already mark one primary partition on the hard drive, Disk Management will unmark partitions as active.įixed: mark partition as active greyed out on Windows 10/8/7 On a hard drive, you are only allowed to mark a primary partition as active. Only one primary partition can be marked active. ![]() Thus, if there is no primary partition, you will find the problem: mark partition as active greyed out.Ģ. However, both of them can only be saved on the primary partition instead of a logical partition. If you want to boot your computer, you must need both operating system and boot files. Only primary partition can be marked active. Why does mark partition as active greyed out?ġ. The actual operating system has to be located in the correct spot on the hard drive. Furthermore, the boot loader must clearly get the location of the OS on the physical hard drive. The active partition should contain the boot loader and boot files for the OS. The active partition must have a boot sector created by the operating system. ![]() At the same time, you still need to pay attention to the following things: Thus, if you want to boot your computer, you need an active partition. After that, restart your computer as usual. The boot sector at the start of the active partition will then execute the boot loader (an operating system utility) to download the operating system boot files. When you boot your computer, BIOS will initially search for an active partition among the major partitions. If you set one primary partition as active partition, you cannot set another partition on this drive as the active partition. For example: if your computer is Microsoft Windows, the active partition is a partition contains Windows.Īt the same time, there is only one primary partition can be set as active partition or bootable partition on each hard drive. The active partition is a primary partition on your hard drive, which can be set as the bootable partition and contains operating system.
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