![]() Click the Restore button in Disk Utility's toolbar. If the command reports dd: /dev/rdiskN: Resource busy, you need to unmount the volume first sudo diskutil unmountDisk /dev/diskN. ![]() As a short background, we use mdadm to create RAID-0 stripped devices for our Sugarcube analytics (OLAP) servers using. #TERMINAL COULD NOT UNMOUNT DISK RESOURCE BUSY SOFTWARE#mdadm: device or resource busy Alex Boisvert - I just spent a few hours tracking an issue with mdadm (Linux utility used to manage software RAID devices) and figured I'd write a quick blog post to share the solution so others don't have to waste time on the same. Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). Because I do not have a recent backup, I would like to create a disk image of the entire boot disk. In my opinion, it would make your posts a little. It is running on a Windows Server 2008 R2 SP1 HP Proliant Server running the Hyper-V role under Server Core. ![]() We recommend that you only use a disk image if you are backing up to a network volume connected to via ethernet, and we recommend using locally-attached storage for your primary backups. Select "Disk Utility" from the boot menu Go to "First Aid" to verify and repair the disk, or go to "Erase" to format the disk Again, if the disk throwing the errors is the same as the primary boot partition that Recovery is also on, the above method may not work to resolve the problem. ![]()
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