Page Comparison rules

Comparison rules define how duplicate files will be compared. On the page you can set up when the duplicates will be considered as equal.

The following options let you specify what comparison criteria is used to consider files as equal:

Option Description
Size Duplicates being considered as equal if files have an equal size.
Timestamp Duplicates being considered as equal if files have an equal date and time.
Attribute Duplicates being considered as equal if files have an equal attribute. File attributes can differ in some OS, for example in Windows 2000 and Windows 98.
Ignore NTFS/FAT differences
(up to 2 seconds) The DOS FAT system stores file timestamps to the nearest 2 seconds only, while NTFS and HPFS can represent timestamps to the nearest 100 nanoseconds. Copying across a network, between file systems, can result in files with slightly different timestamps. If this option is checked, those files would be treated as if they had the same times. This option is useful for comparing directories between computers with different file systems.
Ignore daylight saving
(usually 1 hour) The DOS FAT file times are not adjusted for Daylight Saving Time (DST), whereas NTFS entries are. When NT family automatically adjusts for DST, the date/time stamp of files on NTFS volumes appear to be shifted by one hour, even if the files were last changed prior to the DST adjustment. This adjusted time is then displayed in all operations which report local time (that is, NT Explorer, File Manager, directory listings, and so on). When files are copied from an NTFS drive to a FAT drive before the time change, the times can differ by an hour, but the files remain the same. If this options is checked, those files would be treated as if they had the same times. This option is useful for comparing directories between computers with different file systems.
Adjust timezone
Ignore filetime differences in hours Sets filetime differences in hours. It is available if the Adjust timezone is checked.
Job execution priority Allows to set a CPU priority for the job execution. Note: it may be not sufficient to adjust the CPU scheduling priority; even with an idle CPU priority a job can easily interfere with system responsiveness when it uses the disk and memory.

Option	Description
Size	Duplicates being considered as equal if files have an equal size.
Timestamp	Duplicates being considered as equal if files have an equal date and time.
Attribute	Duplicates being considered as equal if files have an equal attribute. File attributes can differ in some OS, for example in Windows 2000 and Windows 98.
Ignore NTFS/FAT differences (up to 2 seconds)	The DOS FAT system stores file timestamps to the nearest 2 seconds only, while NTFS and HPFS can represent timestamps to the nearest 100 nanoseconds. Copying across a network, between file systems, can result in files with slightly different timestamps. If this option is checked, those files would be treated as if they had the same times. This option is useful for comparing directories between computers with different file systems.
Ignore daylight saving (usually 1 hour)	The DOS FAT file times are not adjusted for Daylight Saving Time (DST), whereas NTFS entries are. When NT family automatically adjusts for DST, the date/time stamp of files on NTFS volumes appear to be shifted by one hour, even if the files were last changed prior to the DST adjustment. This adjusted time is then displayed in all operations which report local time (that is, NT Explorer, File Manager, directory listings, and so on). When files are copied from an NTFS drive to a FAT drive before the time change, the times can differ by an hour, but the files remain the same. If this options is checked, those files would be treated as if they had the same times. This option is useful for comparing directories between computers with different file systems.
Adjust timezone Ignore filetime differences in hours	Sets filetime differences in hours. It is available if the Adjust timezone is checked.
Job execution priority	Allows to set a CPU priority for the job execution. Note: it may be not sufficient to adjust the CPU scheduling priority; even with an idle CPU priority a job can easily interfere with system responsiveness when it uses the disk and memory.