![]() When starting the disk management, it wants to initialize the new disk for our mirror first: The creation of the mirror can be started from the Disk Management: Transfer data of the recovery partition to the secondary disk Transfer data from primary EFI partition to secondary disk Right-click on the c-drive of the primary disk Initialize new disk with GPT: Type: BasicĬreate partitions on the additional disk equal to the primary disk Install additional disk with at least the same storage space Setting up a Windows 10 / 11 mirror: UEFI bootįor a better overview, I have summarized the individual steps: Additional data medium In the case of UEFI, there is an EFI system partition at the beginning of the boot hard disk:Ī prerequisite for mirroring the system disk is, of course, a second disk with sufficient storage space. The easiest way to determine whether EFI is in use is in the Disk Management. If you still use the legacy boot mode on your PC, you can change it to UEFI as follows: Change Windows 10 BIOS (Legacy) to UEFI Boot. Since today UEFI partition layouts are used to a large extent, I have adapted the article. Originally, I described mirroring a legacy disk in this post. I was only able to solve the problem by creating a partition with the exact size of the C partition as a placeholder for the mirror on the second hard drive, and removing it later. Since mirroring the C disk creates the partition on the second disk by itself, but this is not at the end of the disk by default, this is a bit of a chicken-and-egg problem. To ensure that the secondary hard disk gets the same partition IDs, it must be converted to dynamic only last. To prepare the computer for the failure of the primary hard disk, the system partitions must be created in the correct order. Anything but self-explanatory is the handling of the additional boot and system partitions. Mirroring the Windows partition (c:) is initially a very simple matter and works almost self-explanatory. Even though converting a BASIS disk to dynamic usually makes no difference in practice, the conversion should be considered briefly because it cannot be easily undone. Originally, dynamic disks were an innovation, but today they are rather exotic and more a relic of times past. Prerequisite: dynamic disksĪs a basis for mirroring, the hard disk must be converted into a dynamic disk. Mirroring hard disks on Windows is by no means new, Windows has supported it for decades. This variant of course requires a bit more system resources, but is hardware-independent. ![]() As an alternative, the mirror can be set up on Windows if a Home version isn't currently in use. In this case, the controller does the work and presents two mirrored disks as one to the operating system. ![]() In addition, many motherboard manufacturers offer the possibility to mirror hard disks in the BIOS. Windows includes a solution for mirroring hard disks. To do this, the mirror could be added as described here, and then removed again. For this reason it would also be conceivable to clone a hard disk via "mirroring". ![]() A mirror is something like the permanent cloning of the hard disk, so the constant comparison of both hard disks. In some internet articles mirroring is confused with cloning, see also: hard disk cloning, copying, image tools. This article is also available as Youtube Video. If a hard disk fails, the data is available on the second disk, the computer continues to work and can be started with the setup described here even after the failure. Mirroring the Windows partition is very easy, but not setting up the partitions so that it is possible to boot from the 2nd hard disk in the event of an error. Mainly a hard disk mirroring is used for the protection against the failure of a hard disk. Mirroring is the simultaneous writing to two hard disks, also called Raid 1. ![]()
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