![]() Working with Advanced OptionsĪfter pressing the button Advanced Options, Sync Checker will open a dialog sheet where additional settings for the compare operation can be specified: Advanced Options Instead, it will report that the matching file for A is missing in the second folder, and the matching file for B is missing in the first folder. Even if they still have the same contents, Sync Checker won’t test if file A equals file B. If the synchronized file A has been renamed to B in the second folder, their special relationship will be lost. If there is a file named A in the first folder, the task of Sync Checker is to verify if there is also a file named A in the second folder, and if both files A have identical contents and identical attributes. ![]() The whole conception of file synchronization is based on names. Note that the permission settings of a volume are very likely not correctly synchronized in case the ownership settings had already been inactive when that volume was written. Sync Checker will automatically offer you to disable this feature if it detects such a problem. This means the option Ignore ownership on this volume which can be set via the Info panel of the Finder must not be switched on for any of the volumes which should be compared. Sync Checker must have access to the actual permission settings stored in the affected file systems. In such cases, Sync Checker will only test if the aliases themselves are referring to the same objects, but it won’t test whether the referenced objects also have identical contents. However, Sync Checker will not cross disk boundaries: If you have used aliases, symbolic links, or mount points to refer to other disks in one of the specified folders, those disks won’t be included in the compare operation. This affects the objects in the folders themselves, the objects in the subfolders of the folders, the objects in the subfolders of the subfolders, etc. The control window of SyncChecker General principlesĪll objects contained in the two folders you selected will be processed by Sync Checker. when the storage medium holding an object has a technical defect, so some part of its contents has been damaged although the metadata records are matching. Note that this assumption could be wrong in special cases, e.g. The effort to compare the actual contents might not be necessary, so the program can save a lot of time not performing this exact check. This means if no part of the metadata of an object has changed, it will be very likely that the object’s contents did not change either. When files are updated by applications, the operating system usually makes sure that the additional information about this file (the so-called metadata), in particular the item for time and date of last modification, are updated as well. You can speed up the compare operation by selecting the option Assume that files with identical metadata are equal. This comparison is accurate under all circumstances, but the operation can be slow. When selecting the option Compare each byte, Sync Checker will open each pair of matching files in the two folders and compare their contents byte by byte. If you choose the folders via the navigation panel, Sync Checker will allow you to see hidden files and will also show macOS bundles as they really are, namely folders simulating files.
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