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Windows 7: Sata Disk 0 and Disk 1

05 Sep 2011   #11

Windows 7x32 Home Premium & XP SP3 x86

Quote   Quote: Originally Posted by theog View Post
Windows will see the HD Drive Disk0 when corrected to the first Sata port with a HD Drive. On Some MOBO the first Sata port is marked Sata 0 or Sata 1.
But if you have a IDE HD Drive also corrected, Windows will see the IDE as Disk0.
If two HDs are connected to the SATA ports, must the intended OS be onboard the lowest numbered SATA port occupied?

What I am really asking, I think, is will the other OS simply be ignored because it is not on the lowest numbered SATA port?

My System SpecsSystem Spec
05 Sep 2011   #12

Microsoft Community Contributor Award Recipient


What I am really asking, I think, is will the other OS simply be ignored because it is not on the lowest numbered SATA port?
Only when the other HD Drive is not connected.

If two HDs are connected to the SATA ports, must the intended OS be onboard the lowest numbered SATA port occupied?
Best installed to lowest numbered SATA port
My System SpecsSystem Spec
05 Sep 2011   #13

Windows 7 Home Premium 64 bit

My System SpecsSystem Spec

15 Feb 2012   #14

Windows 7 Enterprise x64

I manage labs of test machines that always run multiple sata drives having multiple partitions each. In order for our automated tools to run correctly, drive letters must always be assigned to the correct partitions on each drive. When Vista & Windows 7 started arbitrarily enumerating the first sata drive as disk1 and second one as disk0 during installation, it screwed up all our drive lettering, and hence our automated scripts stopped working.

I searched online for how to correct this but found no easy way. I finally came up with a solution that's a little cumbersome but works every time.

When you start to install Vista / Win7, check which drive it's enumerating as disk0. If it's the one you expect then great - just continue the installation. If NOT, however, follow these steps:
1. Abort the installation, reboot and launch BIOS setup
2. Turn off (disable in BIOS) all drives except the one you want as disk0
3. Save, reboot and restart the installation; it should properly enumerate your desired drive as disk0 (since there are no other drives)
4. After finishing your installation, reboot, launch BIOS setup, and re-enable your other drive(s), then save and reboot again
5. Use the Disk Management tool in Windows to re-assign drive letters (since your CD/DVD-ROM drive(s), etc. will have been assigned lower letters than your hard drives/partitions - easy to fix in Disk Management but it's recommended that you do this before installing any programs on the newly installed OS.

If you don't have the ability to disable a particular sata drive in your BIOS, you'll have to shut down the computer and physically unplug the sata cable from the drive(s) that you don't want showing up during OS installation, then plug them back in after the OS is installed.
My System SpecsSystem Spec
15 Feb 2012   #15

Windows 7x64 Home Premium SP1

This has been discussed on a number of occasions. Here is one thread that discusses it and still gets my vote for the best answer (Dwarf's post).
Diskpart / Disk Management vs the BIOS
My System SpecsSystem Spec

 Sata Disk 0 and Disk 1

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