[H] hidden partition

[Winterlight]

I am helping a friend with a circa 2002 Compaq EVO. It is a corporate 
machine he got from work.  It has a Primary partition with the OS 
installed, I created a second partition for Data and I see a small 
hidden partition that I assume has something to do with Compaq's 
recovery disk.... so what happens if I delete that partition all together?