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"Data Stream Size" setting in Deduplication Disk

Level 3

All, I have been working thru some performance problems with Deduplication Disks.  I have started using Client Side Dedup with great sucess.  However I am still interested in the "Data Stream Size" setting within the properties/details of the Deduplication Disk.  It is by default set to "512 KB".  If you read the user manual it says that it can be changed to work with your storage.  That is all the info I can find about it!  Even Google seems to be stumped.  Am I the only one wondering what settings would work best with my storage?  Anyone know why you would choose a smaller or larger value?  Should I just not mess with it?

btw - running Backup Exec 2012 to disk.