New install of win10 doesn't recognise older win7 drive for dual boot?

Well, I wasn't expecting it to need a reboot to load win 7.

Megahertz said:

Well, I wasn't expecting it to need a reboot to load win 7.

Same here.....but, it did boot to each O/S when requested.

Glad it worked for worked for you!

Navy gave you the operation you requested.

In my opinion, If you use Boot Menu to boot to Win 7 would be simple and faster. Even to boot the default Win 10 will be faster as you don't have to, every time you boot, wait the timeout or select Win 10.

Boot Menu is an option on BIOS to override the default boot priority set on BIOS.
As you have a UEFI BIOS, you probably has it. You didn't give us your MB specs but if it is a Asus, you launch Boot menu pressing F8 during Post. On my Gigabyte is F12.

Briefly, now:
Win 10: Boot into win 10 boot loader, select win 10 or wait for the timeout
Win 7 :Boot into win 10 boot loader, select win 7, reboot, boot win 7.

Briefly with Boot menu:
Win 10: Boot into win 10 boot loader (no timeout delay)
Win 7: During POST, Press F(?) to launch Boot Menu, select Win 7

Navy may even have a better suggestion.

It's mostly personal preference with pros and cons for each method. I prefer the multi boot menu of the Windows 10 boot manager. Some people prefer the UEFI boot override menu. Since people say that running Windows 7 in a virtual machine under Windows 10 host is the only way to go. Boils down to which method the owner likes the best.

Thanks for the extra info.

F8 is the Boot Menu for the Asus p9x79 pro and I must admit it is a faster way to choose the different O/S once the correct drive has been selected - with 6 disks it's not initially clear which one had the Win7 install.

I guess the Win10 boot loader has to reset out of the Win10 boot environment to load Win7 causing the reboot and an extra 30 sec or so.

It's not a big deal as I have now set up the Photoshop workstation in Win10 with the AdobeCC software and all the new feature/programs work ( some were not compatible with Win7 ). Win10 will be the default, but, the speed hit is the price to pay for having a nice looking dual boot screen. I guess over time I will completely migrate from Win7 and release the SSD for use as a scratch disk. For now, I can not bear the thought of reinstalling and setting up FSX again.

Now, the next question is.....do I update the Bios from 1103.rom to 4701.cap to keep that up to date?

My personal opinion is that BIOS should be updated when available.
Some updates are to allow new CPUs released after the last BIOS release.
But some updates has new facilities or functions (like voltage control x clock).
For security reasons I only update BIOS firmware from the BIOS update option in BIOS. Never from Windows.

Agree about updating within BIOS and not Windows.

Back in 2008 I bricked an Asus MB by using the ASUS Windows Updater, no recovery back then and an expensive lesson I won't repeat a lot has changed since then, however, replacing a motherboard did kick off and demystify the self build computer projects.

I might leave the BIOS for another day as I have to find a ROM to CAB converter ( last updated in 2012 ) - it seems ASUS decided to take utility off their download page. There are some downloads from non Asus sites but I won't touch those - way too risky.

Cheers

Gigabyte has two BIOS chips. Asus can use the BIOS on the CD that came with the MB.
So it is quite safe to update the BIOS on modern MB.
What you mean by "I have to find a ROM to CAB converter" ? The download BIOS file is P9X79-ASUS-4801.CAP
Cant you just update using it?
Make sure you download the correct BIOS
There is a P9X79, a P9x70 LE, a P9X79 PRO and a P9X79 DeLuxe

Hi Megahertz

After BIOS 1203 they changed the structure from .ROM to .CAP. There is a section on the ASUS description saying

P9X79 PRO BIOS 2002
1. Improve system stability.
2. BIOS structure changed from .ROM to .CAP for Windows 8 full-functionality.

*If your BIOS version is 1203 or older, please install the BIOS Converter and then the converter will update BIOS to 2002.CAP. The BIOS Converter is available in the BIOS Utilities.

The BIOS converter is no longer on the ASUS website, as far as I can tell. I can see links to 3rd party driver sites, but, I won't go there.

I will keep digging......and possibly contact ASUS for the file/link.