Looking at the Disk utility, it turns out that the install had set up the disks correctly, in spite of what the install menu showed.
I added the following to /etc/grub2/grub.cfg just after the 10-linux section:

menuentry "Windows 7 Professional SP1" {
        insmod ntfs
        set root=(hd1,2)
        chainloader +1 }

And all is working OK, except now I have a laptop fan running all the time at full speed.

Regards
Bill Maidment
 
 
-----Original message-----
> From:Bill Maidment <[log in to unmask]>
> Sent: Tuesday 7th October 2014 10:29
> To: Users, Scientific Linux ([log in to unmask]) <[log in to unmask]>
> Subject: SL7rc Dual Boot Issues
> 
> I have been using dual boot SL6.5 and Windows 7 successfully on my laptop.
> The disk setup is:
> HD0 - /dev/sda - Seagate - SL6.5
> HD1 - /dev/sdb - Toshiba - Windows 7
> HD2 - /dev/sdc - MSATA - cache for Windows 7
> 
> I replaced the Seagate drive with a spare Seagate and when I tried installing SL7rc2 the installer recognised only the Seagate disk as /dev/sdb - no mention of sda or sdc.
> The installation went OK and SL7 booted and ran OK, But I can't access the Windows disk.
> 
> I looked at the grub2 configuration and realised that I was completely out of my depth. How could the simplicity of the old grub be so bastardised????
> Swapping back to the original Seagate drive gave me back my original setup with no damage done.
> 
> Can anyone point me in the right direction to get these drives correctly recognised in the SL7 installer and grub2?
> 
> Regards
> Bill Maidment
> 
>