|10-19-2005, 02:57 PM||#1|
Join Date: Apr 2001
Dynamic disks not supported for laptops or XP Home?
Okay, so I had a situation on my Dell D600 laptop where ... before I had to format and reinstall I could initialize my USB hard drive case with a converted dynamic disk inside. Format and reinstall, now I can't do it.* I'm posting this in case it helps anyone else.
(PS:* Dynamic drives won't work in XP Home either, just for reference!)
When trying to use DISKPART, I also received the error "dynamic disks are not supported on this system". I knew they were supported previously, so I started exploring usenet and other places.
I found this page, then thumped Google a few more times with different terms. I found this MS KB article:
Option to Upgrade Basic Disk to Dynamic on Laptop Not Available: http://support.microsoft.com/kb/232463/EN-US
Then I found this one:
Dynamic Disk Hardware Limitations: http://support.microsoft.com/kb/q254105
So, I think to myself, "Windows XP knows I have a laptop .... but HOW?!"
I start dorking around. I know this works on my laptop, so I compared the Disk Management Service on my laptop with a desktop I have (both use Windows XP Professional SP2). Both files diff out to be the same size and everything.
So I go into the registry and look at HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\Dmio to see what parameters the service starts up with, thinking it might be a parameter or flag causing the issue when the disk mgmt service starts.
(NOTE: DO NOT HACK THE REGISTRY UNLESS YOU KNOW WHAT YOU ARE DOING, YOU CAN RUIN YOUR COMPUTER)
So, I compare the registry values between the laptop and workstation and notice the "Start" DWORD value is different between the laptop and the workstation for the dmio key. Strange. I wanted to know more, so I searched the Microsoft Knowledge Base at support.microsot.com for "dmio start". I found this article:
System or Boot Disk Listed as Dynamic Unreadable in Disk Management: http://support.microsoft.com/?kbid=236086&sd=RMVP
This KB article gives a list of related dmio keys. When plugging deeper into the registry, I notice there is a list of keys with start values, all are related to Logical Disk Management:
All of these keys have "Start" DWORD values.
So, I went into the Dekstop registry and jotted down the start values for each dm* service. They were:
I applied those same values to the same keys on my laptop's dm* entries, then rebooted.
Well, when I opened disk management the next time, I was pleasantly surprised to see that the "activate disk" option was present again for the external USB hard drive. I converted the disk and now I'm up and running again happily.
I still do not know the purpose of the Start DWORD values and how they get the disk management to recognize if you're on a laptop or desktop, but ... changing these values worked for me, so I'm sharing with the world.
Hope this helps someone.
|01-12-2006, 01:59 AM||#3|
Join Date: Sep 1999
Location: Long Island, NY
I knew this info would come in handle somedays. I'm trying to make a desktop behave like a notebook so that I can make it sleep or hibernate. This registry hack maybe just what I need.
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