When you start the Disk Management snap-in, it will enumerate all disks in the system to see if any disks have changed or if any new disks were attached to the system. If Disk Management finds any disks that are unknown, that are not initialized, or that do not have a disk signature in the MBR, Disk Management starts the Write Signature and Upgrade Disk Wizard.
The wizard first prompts you to select which disks that you want to write a disk signature to; by default, no disks are selected. To select the disks, click the check boxes next to the disk numbers.
The wizard then prompts you to select which disks that you want to upgrade to dynamic disks. Each disk that you selected on the first page is automatically selected here. If you continue without clearing the disk check boxes, LDM writes a disk signature and upgrades all the disks that you selected to dynamic disks automatically.
NOTE: This wizard was changed in Windows XP and later. It no longer automatically selects the disks to be upgraded to dynamic.
denke der erste absatz erklärt die notwendigkeit - stimmt mit dem gedankenblitz recht gut überein.
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