problem in GRUB

[mprash]

I have a system with 10 hard drive.In 1st hard drive I have loaded Red Hat
Linux7.0 and in 10th hard drive loaded Red Hat Linux9.0 and using GRUB boot 
loader and when I restart my system it shows only Linux7.0 , not Linux9.0....
and also in device map it shows only 8 hard drive. 
 GRUB only shows 8 hard drives...? or give me suggestion what can I do that
it reads 10th hard drive also.

plz send me information... it's very important.
 my id : address@hidden

 regards
Prashant
Mithaulia