ZyXEL Communications NSA221 User Manual page 218

Chapter 9 Applications
USB <-> NSA
When you synchronize files in both directions simultaneously, both storage devices
transfer unique files to one another. Files with the same file name are
synchronized according to their modification date/time. The difference in
modification time between the two files has to be greater than five minutes. More
recently modified files overwrite the older ones during synchronization.
The following figure illustrates how synchronization works when you synchronize
files in both directions simultaneously.
Figure 113 Synchronizing Files Example 2
Before Sync
A
(new)
After Sync
A
(new)
A on the USB device and B on the NSA are modified more recently.
• File A from the USB device replaces file A on the NSA.
• File B from the NSA replaces file B on the USB device.
• A copy of file C from the USB device is transferred to the NSA.
• A copy of file D from the NSA is transferred to the USB device.
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USB
C
B
USB
C
B D
(new)
NSA
B D
A
(new)
NSA
D
B
C
A
(new)
(new)
NSA221 User's Guide