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diff --git a/BUILD/Help/html/advanced/DaylightSavingTime.html b/BUILD/Help/html/advanced/DaylightSavingTime.html new file mode 100644 index 00000000..4fffe036 --- /dev/null +++ b/BUILD/Help/html/advanced/DaylightSavingTime.html @@ -0,0 +1,69 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<HTML> +<HEAD> + <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=windows-1252"> + <TITLE></TITLE> + <META NAME="GENERATOR" CONTENT="OpenOffice.org 3.0 (Win32)"> + <META NAME="CREATED" CONTENT="20091208;20054200"> + <META NAME="CHANGED" CONTENT="20091211;18381300"> + <META NAME="Info 1" CONTENT=""> + <META NAME="Info 2" CONTENT=""> + <META NAME="Info 3" CONTENT=""> + <META NAME="Info 4" CONTENT=""> + <STYLE TYPE="text/css"> + <!-- + @page { margin: 2cm } + P { margin-bottom: 0.21cm } + H2 { margin-bottom: 0.21cm } + H2.western { font-family: "Arial", sans-serif; font-size: 14pt; font-style: italic } + H2.cjk { font-family: "MS Mincho"; font-size: 14pt; font-style: italic } + H2.ctl { font-size: 14pt; font-style: italic } + A:link { so-language: zxx } + --> + </STYLE> +</HEAD> +<BODY LANG="de-DE" DIR="LTR"> +<H2 CLASS="western" STYLE="font-style: normal"><FONT FACE="Tahoma, sans-serif">Daylight +saving time</FONT></H2> +<P STYLE="margin-bottom: 0cm"><BR> +</P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">The +Windows operating system exhibits quite a unique behavior when +handling timestamps on NTFS file systems. This leads to a well-known +issue that all file synchronization software has to handle:</FONT></P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">During +daylight saving time switching, (local) file times are shifted by one +hour on NTFS file systems, while NO shift occurs on FAT/FAT32 drives +(as used by most USB sticks)! Thus when synchronizing an NTFS against +a FAT32 volume file times become asynchronous twice a year!</FONT></P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">For a +comprehensive discussion about this issue refer +to:<BR><A HREF="http://www.codeproject.com/KB/datetime/dstbugs.aspx">http://www.codeproject.com/KB/datetime/dstbugs.aspx</A></FONT></P> +<P STYLE="margin-bottom: 0cm"><BR> +</P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif"><B>Solution:</B></FONT></P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">In +order to avoid re-copying files that have a modification time +difference of +-1h FreeFileSync offers a global option: <I>Menu -> +Advanced -> Global settings: Ignore 1-hour file time difference</I>.</FONT></P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">If +"<I>Ignore 1-hour file time difference</I>" is checked, all +files with a +-1h difference are treated as having the same time. +This also handles different file time precisions (NTFS: 100ns, +FAT/FAT32: 2 seconds) by allowing a 2 second tolerance .</FONT></P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">Files +that have a deviation of less than one hour are categorized as +conflicts. The reasoning is that these files surely have been +modified on at least one side since last synchronization. But during +one of the two daylight saving time switches per year the older file +is shown pretending a newer date which can lead to data loss (when +using the rule to overwrite older with newer files).</FONT></P> +<P STYLE="margin-left: 1.46cm; margin-bottom: 0cm"><SPAN ID="Rahmen1" DIR="LTR" STYLE="float: left; width: 80%; height: 0.14cm; border: 1px solid #000080; padding: 0.05cm; background: #ccccff"> + <P ALIGN=LEFT STYLE="margin-left: 0.79cm; margin-right: 0.98cm; margin-bottom: 0cm"> + <FONT FACE="Tahoma, sans-serif"><B>Note:</B><BR>If synchronization + takes place between NTFS ↔ NTFS or FAT32 ↔ FAT32 this + checkbox provides no advantage and can be left unchecked.</FONT></P> +</SPAN><BR CLEAR=LEFT><BR> +</P> +</BODY> +</HTML>
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