DNG file modification date not changed by writing metadata?

I use LR 2.7 on Windows XP. To my surprise, I just noticed that writing metadata updates (e.g., new keywords) from LR to the DNG files does NOT appear to update the file modification date, which suggests obvious issues for backup strategies (yes, I understand that a changed modification date introduces other backup issues). I have verfifed that the metatdata does indeed change in the DNG files, so I am mystified. Can someone shed some light on this? Thanks.
js
www.johnshorephoto.com

Yes, I explicitely invoke "save metadata to file".   Furthemore, I have checked the behavior by (a) modifying DNGs in LR; (b) saving the metatdata to the DNG; (c) creating a new LR catalog and importing the revised DNGs.    The metadata changes do show up in the re-imported DNGs (and the metadata field "Metadata Date" correctly shows the recent change). Morevover, the file sizes do change (wth the metadata changes) even though the modification dates shown in windows explorer do not change.
However, I just redid the experiment to double check, and discovered an important clue - the mysterious behavior occurs when the DNG files are on a NAS device (in particular a Netgear ReadyNAS Duo.   To summarize:
     - When the DNG files are on a local hard drive, the file modification dates change as expected
     - When the DNG files are non local (i.e., on the network but on a NAS device), the file modification dates do not change even though the file sizes do change;
What's more, I see the same behavior when accessing the DNGs via Adobe Bridge (CS5) - i.e., if I change the metadata, I'm asked if I want to apply the metadata changes to the DNG, and I say yes (and confirm by looking via Bridge at a copy of the changed file).   On a local disk, the file modificaiton dates change (as do the modification date displayed in Bridge), but if the files are on the NAS, the modification dates do not.
Any additional thoughts?
js

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DNG file modification date not changed by writing metadata?

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