![]() The probability of a failed detection of different files (with same size) increases with 2. Time zone shifts are not only full hours but may be as small as quarter of an hourģ. The next sync in automatic mode will bring up a conflict because the files were not "in sync" last time, therefore it cannot deduce a sync-direction for the current sync.Ģ. ![]() Timeshift occured (either due to dst or timezone travel), files have a different date, but are marked as equal. This idea basically would be the generalization of the current "+-1h" settingġ. This assumption may eliminate a lot of cases for furtherĬontent comparison (which could be costly) and speed up the sync. Versions of a file within 24h with exactly the same minutes and seconds. Why 2.2.1 could be acceptable? The probability of saving two different If it's the same - finally compare the content (MD5?). And in such case:Ģ.2.1 - simple consider they are the same (simple, fast and quite effectiveĢ.2.2 - compare file sizes. If it is - they could be the same version. is the difference equals exactly 'N' hours AND is equal or less thenĢ.2. If they're the same - go to next filesĢ.1. Improved by implementing this simple way:ġ. To separate only changed files from the rest - I think it could be But keeping focus at the main goal here. These days that’s probably the most practical solution in most cases.By some reasons I can't add any posts there. Then I converted the external drive I was using to NTFS and the problem went To be completely honest, I simply lived with it for several years. Standard Time 8:32 AM 8:32 AM Daylight Saving Time 8:32 AM Time of year File Creation Date NTFS Displays FAT displays Standard Time 8:32 AM Will think they’re different and copy the “newer” one onto the older one. With daylight saving time in effect, and the timestamp on the NTFS driveĪnd a file copying utility that uses the timestamps to see which is newer When displayed the NTFS time is adjusted by your time zone, which is now -4 NTFS disk and 8:32 AM on the FAT disk – but they no longer display the same The time stamps are still stored exactly as they were – 13:32 UTC on the Same when displayed the NTFS time is adjusted by your time zone, subtracting 5 – 13:32 UTC on the NTFS disk and 8:32 AM on the FAT disk – but they display the To continue with our example, let’s assume you copied a file from an NTFSįormatted disk to a FAT formatted disk in the Eastern time zone while daylight Time it was written had daylight saving time been in effect at the time it wasĪnd yes, I’ll happily admit it’s confusing as all get out. Time, the same file’s timestamp will be displayed as 9:32AM – that’s the (“spring forward”) UTC-4 – Eastern Daylight Time (EDT). Is UTC-5 unless you’re in daylight saving time, in which case it’s Here’s the rub: Eastern time, or more correctly Eastern Standard Time (EST) When the file’s time isĭisplayed, then of course, the time zone is once again factored in and the time That means if it’s 8:32AM,Īnd you’re in the U.S.’s Eastern time zone (ET) which is UTC -5, then theĪctual time written to the disk is 13:32 UTC. (roughly equivalent to Greenwich Mean Time, GMT). In the NTFS, all timestamps are written in Coordinated Universal Time or UTC “In short, it’s all about the file systems.” ![]()
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