I have an external WD My Passport external hard drive for backup on an XP system, and will transfer many of those files to a new Windows 10 system. After transferring some pictures from a stick that came from family members some time ago, as well as some pictures from an email to the external hard drive, I started to get this warning after booting up the XP computer: "F:\System Volume Information\LightningSand.CFD is corrupt and unreadable." In doing some searching about this file I've read that it is associated with Norton products and is not easy to remove. But it's not clear to me whether there is anything to worry about, or any negative impact of this file. Others have gone to great lengths to remove this file. I do plan to continue using the external hard drive as backup on the new system, so I am concerned. Any suggestions would be appreciated.