Retrieving Drives and Folder Structure in highly efficient manner

We desire to get all the drives and folders off a server, but afraid of the processing (CPU) power that will be used.   Is there a way to only go get the drives/folder one time, then only get them again if something has changed to avoid using up so much CPU.  Also, is there a way to export out the folder structure to an xml list so we can insert it into an SQL server with a data type of xml?

we are using vb.net (vs 2010) if anyone desires to show code.   One note, we are NOT interested in getting any files, just the drives and folders

thanks
rknealAsked:
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CodeCruiserConnect With a Mentor Commented:
The basic method that you can use is Directory.GetDirectories. It would return you a list of all the folders and subfolders within a path (such as C).

http://msdn.microsoft.com/en-us/library/c1sez4sc.aspx

Also
http://www.devsource.com/c/a/Languages/Recursive-Directory-Searches-in-C-Part-1/
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Alpesh PatelAssistant ConsultantCommented:
Use Linq to do that. It best way to do this
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CodeCruiserCommented:
When you say folders, do you mean all folders/subfolders within drives?
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rknealAuthor Commented:
yeah, we want to retrieve all drives, folders, subfolders but NO file names and write them to an XML file.
taking up as little CPU is important. If there is a way to know something changed to drive, folder, subfolders so don't have to keep doing it, that would be even better but if not would settle for most efficient way to do it.  Sounds like Linq would be best, but any samples would really be appreciated!
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