Microsoft released a new Windows Home Server patch, KB950193 which fixes an issue discovered in Power Pack 1, when a hard drive is reported as missing from a health notification in the Windows Home Server Console, files that are in shared folders may be unrecoverable if the shared folders have Folder Duplication enabled.
This issue occurs for one of the following reasons: “a hard drive on the home server was removed incorrectly, a hardware failure has occurred on a hard drive.” To avoid this issue, you must use the Remove a Hard Drive Wizard before you physically remove any hard drives from your home server. The Remove a Hard Drive Wizard is available on the Server Storage tab of the Windows Home Server Console.
Windows Home Server helps protect users from the incorrect removal of a hard drive or the physical failure of a hard drive. A bug was discovered that relates to how Windows Home Server Power Pack 1 manages file duplication when a hard drive is incorrectly removed or when a hard drive experiences a hardware failure.
The fix will be issued via Windows Update – those of you with Automatic Updates switched on will receive this update automatically. The rest of you will need to run Windows Update manually from the Windows Home Server Console. My advice is to go and do that now. Then switch on Automatic Updates.
Source:→ Microsoft Knowledge Base