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Cloning Disks

Explanations of Disk Cloner Messages

Messages in the disk cloning window instruct you or indicate the current state of the program. Below are given explanations of them.

Select source and destination
– Suggests you select the source and destination disks.

Clone will not be bootable (Source is not bootable)
– The disk clone will not be bootable because the original disk was not bootable.

Clone will not be bootable (Destination is not bootable)
– The disk clone will not be bootable because the file system or partitioning of the destination disk does not comply with the requirements.

Clone may be bootable
– More likely the disk clone will be bootable.

Destination has insufficient space
– The volume of the destination disk must be equal to or greater than the volume of the source disk.

Source and destination must differ
– The same disk cannot be selected as the source and destination at the same time. Choose another disk for either the source or destination.

Destination is read only
– The selected destination disk has hardware or software write protection. Deactivate the protection or select other disk.

Source or destination is not accessible
– The program cannot access a previously selected disk. If you use an external or network disk, make sure that it is connected. To verify that a disk is accessible, try to preview its contents in Finder.

Mac OS Extended or APFS required for source and destination
– The file system of the source or destination disk does not comply with the requirements.

Mac OS Extended (Case-sensitive, Journaled) recommended for destination
– Since the source disk has case-sensitive format, it is recommended that you format the destination disk with the "case-sensitive" option.

Clone will not be bootable (unable to create bootable volume on the destination)
– The destination volume is APFS formatted while the source has Mac OS Extended formatting. To make the destination volume bootable, it's formatting should be also Mac OS Extended.

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