The disk unknown not initialized error may happen because of partition on the hard drive is lost or deleted. Sometimes, the external hard drive is unknown not initialized because of virus virus infection. An outdated driver may cause disk 1 unknown not initialized in Windows Disk Management. And actually, there are many reasons would cause the error. To figure out how to fix disk unknown not initialized error, you need to know why it happens. Fortunately, this article will show you why hard drive not initialized in Disk Management and how to solve the problems you have met. And you have no idea of how to solve this issue. The bad thing is that when you try to initialized using both Diskpart and Disk Management, it says disk is not ready. No matter how it displayed, you cannot access data stored on the Disk 1. Or it is shown as Disk unknown, not initialized, unallocated space in Windows Disk Management. It is shown as Disk unknown, not initialized, no disk space, like the following screen shot. When you try to use an external hard drive on your Windows 10, you may meet the problem that your Disk 1 unknown not initialized in Windows Disk Management. Here you can learn how to fix the disk unknown not initialized error in different ways.