data reading problem..

In LVM I have one volume grp and it has two logical volumes A and B and both are full,so I extended my volume grp to 1GB with another hard disk and add this space to A and put my resr data .Now problem is that I get data from first hard disk only but I m unable to find data which is in second hard disk.I m using a s/w WinHex to find hard disk data ..Plz give advise to overcome from this problem..