How do I modify GRUB to recognize my Windows installation which is on another disk in a dual boot system?

Solution Verified - Updated -


  • Not able to install Red Hat Enterprise Linux  and Microsoft Windows on two hard drives for dual booting.


  • Red Hat Enterprise Linux (all versions)
  • Microsoft Windows (all versions)
  • The Red Hat Enterprise Linux installation is on /dev/hda drive or primary master device
  • The Windows installation is on the /dev/hdb drive or primary slave device

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content