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Windows 7: Diskpart / Disk Management vs the BIOS


03 Aug 2011   #11
Microsoft MVP

W 7 64-bit Ultimate
 
 

Hello mjf.


Here's additional info concerning your post #34 in the other thread, this is getting stranger and stranger, the "Properties, Hardware" does not even match the current disk management listings, those positions have actually changed while I was taking these snips.
Diskpart / Disk Management vs the BIOS-channel-0.jpg
Diskpart / Disk Management vs the BIOS-channel-1.jpg
Diskpart / Disk Management vs the BIOS-channel-2.jpg





My System SpecsSystem Spec
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04 Aug 2011   #12
mjf

Windows 7x64 Home Premium SP1
 
 

After more experimenting I started getting my my disk 0 bumped into disk 1 spot!
All the fiddling (including BIOS boot ordering) couldn't rectify the switch. I now doubt the importance of the registry entries. Changing the registry entries didn't fix the problem

Back to the drawing board - or maybe not.
My System SpecsSystem Spec
04 Aug 2011   #13

Windows 8.1 Pro RTM x64
 
 

I've noticed that on occasions myself, and this is my theory as to why it happens.

When you power up your system, and this is more from when you do so from a power off situation, i.e a cold boot, rather than a restart, the BIOS as part of its POST routine interrogates the hardware to ascertain what devices are attached to the system. SATA devices are enumerated as part of this procedure. The BIOS lists the SATA ports in the same order as they are labelled on the motherboard, this is to allow for easy device identification from within the BIOS setup (in other words, m/b port #1 is listed in the BIOS as port #1 and m/b port #2 as port #2, etc). However, this does not necessarily represent the order in which the devices respond to the request for their presence in the BIOS POST routine. Unlike the IDE interface, which is enumerated in a fixed order, the SATA interface is enumerated in parallel, meaning all SATA devices are questioned at the same time. The device that responds first is assigned as Channel #0, the second as Channel #1, etc. For devices of equal specification, i.e. identical drives, connected to 2 separate ports (as they must be, seeing as though a SATA port can only have a single device attached to it), sometimes one will respond to the request quicker, and sometimes the other one will.
My System SpecsSystem Spec
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14 Aug 2011   #14

Microsoft Community Contributor Award Recipient

ME/XP/Vista/Win7
 
 

Been playing with my old Vista test Rig. Results below.

Diskpart / Disk Management vs the BIOS-bfk001.png

Installed a JMicron JMB36X Controller.

Name:  BFK002.PNG
Views: 1308
Size:  3.0 KB

Diskpart / Disk Management vs the BIOS-bfk003.png

Are you using a JMicron Controller?


My System SpecsSystem Spec
14 Aug 2011   #15
mjf

Windows 7x64 Home Premium SP1
 
 

I am using a JMicron JMB36X Controller.
My System SpecsSystem Spec
14 Aug 2011   #16

Microsoft Community Contributor Award Recipient

ME/XP/Vista/Win7
 
 

Quote   Quote: Originally Posted by mjf View Post
I am using a JMicron JMB36X Controller.
Can you post a screen shot of Disk management?
My System SpecsSystem Spec
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 Diskpart / Disk Management vs the BIOS




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