The Recovery partition is accessible for reading and writing files to, and deleting files from. If you double-click the Recovery partition from My Computer, the following warning message appears:
This area of your hard disk (or partition) contains files used for your system recovery. Do not delete or alter these files. Any change to this partition could prevent any recovery later.
If you right-click and choose Explore you do not get this warning and have full access to the partition.
This is as designed. HP recommends that you avoid making changes to existing files/directories and do not store additional data on the Recovery partition.