When copying data to your Home Server always use \\<server name>\<share name> rather than D:\shares\<share name>. Files copied to the shares via \\<server name>\<share name> are managed through Drive Extender but if you copy files directly they may not be put in the correct location (particularly if you have more than one drive in your WHS) and this can cause problems since you run the risk that you may create real files in the shares, rather than tombstones. If you do, then Drive Extender won’t be able to move those files off of the primary data partition.
Ken Warren MVP on the WHS Forums added:
“There’s a file system filter driver that deals with the initial writing of the files, the creation of tombstones, and the redirection to the actual file location. That should operate against D:\Shares\etc. just as it operates against \\Server\etc. But (as you can see above) some users have found that when they copied files directly to the D:\ partition, they locked up the space those files were occupying permanently. Then they had to jump through hoops to get everything back in sync. So you should only operate against the shares; that’s why there’s a shortcut to \\Server on the Administrator desktop. You don’t need to map a drive to a share, BTW; you should be able to use the UNC path for everything.”
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