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Windows 7: Sata Disk 0 and Disk 1


08 Jun 2011   #1

Windows 7 Home Premium (Retail) Full version - With SP1
 
 
Sata Disk 0 and Disk 1

For a long while I ran just one HD (Sata) on my machine. It was connected to Sata 1 on the MB and appeared as Disk 0 in Disk Managment. I just connected another Sata drive to Sata 2 on the MB. It shows up as Disk 0 and the original as Disk 1. I had thought the reverse should be true -- Original still as Disk 0 and the new as Disk 1.

BIOS shows the original connected to IDE 3 Master and the added one connected to IDE 3 Slave.

The system works fine with all the partitions and their drive letters I had assigned to them correct.

No big deal. I just wonder why the Disk Management disk numbers appear as they do.

Would someone please help me understand?

Thank you.

My System SpecsSystem Spec
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08 Jun 2011   #2
Microsoft MVP

Win 7 Ultimate x64
 
 

This is one of those things that I don't think anyone has really figured out. You're not the first to ask about it, and from the last thread I saw about it pretty sure there was no definitive answer as to why. At the end of the day it will make you wonder why, but it also has no affect on how anything runs. You can sit and rearrange the cables to the motherboard all day long and you might hit the combination that will change them around, but not worth the aggravation.
My System SpecsSystem Spec
08 Jun 2011   #3

Windows 7 Home Premium (Retail) Full version - With SP1
 
 

Thank you.

So I guess I will right it off as one of those "Life's Imponderables."
My System SpecsSystem Spec
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08 Jun 2011   #4

Windows 7 Ultimate x64 SP1
 
 

There's no mystery about it, if I am understanding your question. The numbers in Disk Management have no relation to the physical ports. If a motherboard has six SATA ports, and the primary hard drive is plugged into the sixth port (SATA5), it will still show as Disk 0 in Disk Management.
My System SpecsSystem Spec
08 Jun 2011   #5

Windows 7 Home Premium (Retail) Full version - With SP1
 
 

And that is pretty much what happened. The original disk is in Sata 1 it appeared as Disk 0. When I put the second disk on Sata 2 it showed as Disk 0 and the original disk in Sata 1(the one that showed as Disk 0) showed as Disk 1.


Quote   Quote: Originally Posted by DeaconFrost View Post
There's no mystery about it, if I am understanding your question. The numbers in Disk Management have no relation to the physical ports. If a motherboard has six SATA ports, and the primary hard drive is plugged into the sixth port (SATA5), it will still show as Disk 0 in Disk Management.
My System SpecsSystem Spec
09 Jun 2011   #6

Windows 7 Ultimate x64 SP1
 
 

I have had times on the same system where a clean install will show the drives in a different order (within Windows). As long as the drive letters are assigned properly, it won't cause any issues.
My System SpecsSystem Spec
05 Sep 2011   #7

Windows 7x32 Home Premium & XP SP3 x86
 
 

Quote   Quote: Originally Posted by stormy13 View Post
This is one of those things that I don't think anyone has really figured out. You're not the first to ask about it, and from the last thread I saw about it pretty sure there was no definitive answer as to why. At the end of the day it will make you wonder why, but it also has no affect on how anything runs. You can sit and rearrange the cables to the motherboard all day long and you might hit the combination that will change them around, but not worth the aggravation.
What then makes the primary disk primary? Is it the simple fact that that disk has an operating system thus it is the primary? What if I install a second HD that also has an operating system installed?
My System SpecsSystem Spec
05 Sep 2011   #8

Microsoft Windows 8.1 Professional
 
 

I had the same issue, installing the ahci drivers for the sata controller sorted them correctly.
My System SpecsSystem Spec
05 Sep 2011   #9

Windows 7 Ultimate SP1 64-Bit
 
 

Quote   Quote: Originally Posted by jsquareg View Post
For a long while I ran just one HD (Sata) on my machine. It was connected to Sata 1 on the MB and appeared as Disk 0 in Disk Managment. I just connected another Sata drive to Sata 2 on the MB. It shows up as Disk 0 and the original as Disk 1. I had thought the reverse should be true -- Original still as Disk 0 and the new as Disk 1.

BIOS shows the original connected to IDE 3 Master and the added one connected to IDE 3 Slave.

The system works fine with all the partitions and their drive letters I had assigned to them correct.

No big deal. I just wonder why the Disk Management disk numbers appear as they do.

Would someone please help me understand?

Thank you.
I'm not quite sure whether I'm absolutely correct, but as far as I'm aware the BIOS recognises the drive that Windows is on as Drive 0.

So even if you connect the Windows drive to SATA 1 it will still show as Drive 0 in disk management.
My System SpecsSystem Spec
05 Sep 2011   #10

Microsoft Community Contributor Award Recipient

ME/XP/Vista/Win7
 
 

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.
My System SpecsSystem Spec
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 Sata Disk 0 and Disk 1




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