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Restore a full-disk .dmg file to a raw block device | 6 comments | Create New Account
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I was attempting to restore a disk but Disk Utility said I first needed to scan image before I could restore with the following error: “Could not find any scan information. The source image needs to be imagescanned before it can be restored.” However Disk Utility would not let me scan the image.
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Restore a full-disk .dmg file to a raw block device
Restore a full-disk .dmg file to a raw block device
Somehow I thought that was what the menu item Images -> Scan Image for Restore always did.. but I suppose there has been at least one occasion where this may have actually been what I needed. g=
Happily, I've never found myself in a position where I needed to restore my backup image files, (made with Carbon Copy Cloner.) But I'd like to know the routine if I ever need to use it. My question: since I back up separate partitions into separate disk image files, is this hint inapplicable to me? Does this hint only apply to backing up multiple partitions into a single disk image? (I had no idea it was even possible to backup multiple partitions to a single disk image..)
Restore a full-disk .dmg file to a raw block device
This is great. I was getting real frustrated with Disk Utility's non-specific error messages. This worked just like you said it would.
Restore a full-disk .dmg file to a raw block device
Great post. However, when I tried this I got a 'Resource busy' error. In order to avoid this problem, you have to make sure the mac OS isn't 'using' the device first. To do this just open the DiskUtility.app, and on the target USB hard drive, unmount any of it's partitions. Make sure to not eject the USB hard drive so that the device is still available in DiskUtility and shows up in the result from 'diskutil list'.
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Restore Dmg Could Not Validate Source Mac
Restore a full-disk .dmg file to a raw block device
Many thanks to you and daveosborne for your hints ! 1) I'm currently dumping the content of a .dmg file to an external disk. 2) 'with an appropriate buffer size to copy over the whole block image, including partition table and boot sector' -> what do you mean by that and how can I determine which buffer size is appropriate ? -> how did you determine the 131072 size ? For my use I trusted blindly the example and used the bs=131072 option. Untill now it seems to be working.. (it's still copying). I'm currenlty getting tons of lines on my terminal screen that look like : .. CZlibDecompressor::decompressData: src 0x02E4AA97 srcLen 116073 CZlibDecompressor::decompressData: dest 0x02E26000 destLen 262144 CZlibDecompressor::decompressData: src 0x02E61F0D srcLen 20723 CZlibDecompressor::decompressData: dest 0x02E26000 destLen 262144 .. with sometimes long series of .. CZlibDecompressor::decompressData: src 0x02E66B71 srcLen 1167 CZlibDecompressor::decompressData: dest 0x02E26000 destLen 262144 CZlibDecompressor::decompressData: src 0x02E66B71 srcLen 1167 CZlibDecompressor::decompressData: dest 0x02E26000 destLen 262144 .. I notice the destLen (I suppose it means block destination length) 262144 is exactly the double of the bs=131072 that was used before. I'm curious if anyone can help me understand this. Does this mean the source data is sparsed over the destination disk by blocks of 131072 or 262144 bytes, thereby fragmenting the disk ? In your replies, please kindly take into account that I'm a French newbie with a fair level of ignorance of OSX command line technical slang, however not completely ignorant with computers either (one piece of paper even says I'm an engineer :), it's just that I don't understand what the buffer size technically means here. Many thanks in advance for your insights !
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Disk Utility User Guide
You can restore a disk image to a disk. To do this, you first need to erase the disk. If the disk image has multiple partitions, you must restore each partition individually.
Restore a disk image with a single volume to a disk
In the Disk Utility app on your Mac, select the volume that you want to restore in the sidebar, then click the Restore button .
This is the volume that is erased and becomes the exact copy.
Click the Restore pop-up menu, then choose the volume you want to copy.
If you’re restoring from a disk image, click the Image button, then navigate to that disk image.
Click Restore.
Restore Dmg Could Not Validate Source 1
Restore a disk image with multiple volumes to a disk
To restore a disk image with multiple volumes to a disk, you must partition the destination disk, then restore each volume individually.
In the Finder on your Mac, double-click the disk image to open it.
The disk image’s volumes appear as disks in the Finder.
In the Disk Utility app, select the disk in the sidebar, click the Partition button , then partition the destination disk.
The destination disk must have as many partitions as the disk image, and each of the disk’s partitions must be at least as large as the corresponding partition in the disk image. See Partition a physical disk in Disk Utility on Mac.
In the sidebar, select the volume that you want to restore, then click the Restore button .
This is the volume that is erased and becomes the exact copy.
Do one of the following:
Restore from a volume: Click the “Restore from” pop-up menu, then choose the volume you want to copy.
Restore from a disk image: Click Image, choose the disk image you want to copy, then click Open.
Click Restore.
Repeat steps 3–5 for each remaining partition.
Restore Dmg Could Not Validate Source List
See alsoCreate a disk image using Disk Utility on MacAdd a checksum to a disk image using Disk Utility on MacVerify that a disk image’s data isn’t corrupted using Disk Utility on Mac