If you start the Disk Cleanup utility and you click the Disk Cleanup tab, a System Restore: Obsolete Data Stores entry is available. These are files that were created before Windows was reformatted or reinstalled. They are obsolete and you can delete them.
If you choose to clean up and delete these files, you will no longer see them under the folders that are mentioned earlier in this article, and the option to delete obsolete data stores will no longer appear on the Disk Cleanup utility.
I was wondering about the sentence "These are files that were created before Windows was reformatted or reinstalled". Does it mean when the hard disk is brand new,
System Restore: Obsolete data Stores would not be available, and from that time onwards, even if we do a complete reformat,
System Restore: Obsolete data Stores would still be there?