Article ID: 976187 - View products that this article applies to.
Expand all | Collapse all

On This Page

SYMPTOMS

After you install or upgrade to Windows 7 or to Windows Server 2008 R2, the DVD drive on your computer is not recognized .

CAUSE

This problem occurs because the SATA driver (Msahci.sys) implements new power management functionality that is known as Adaptive Link Power Management (ALPM). Some optical drives do not behave correctly with ALPM enabled, and therefore these drives may not be recognized by the computer.

The following is a list of some DVD drive models that are known to exhibit this problem:
  • TSST TS-L633B
  • PLDS DS-8A3S

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

To apply this hotfix, you must have Windows 7 or Windows Server 2008 R2 installed.

Restart information

You must restart the computer after you apply this hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
For all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Cdrom.sys6.1.7600.20575108,54414-Nov-200903:35x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Cdrom.sys6.1.7600.20575147,45614-Nov-200903:50x64
For all supported Itanium-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Cdrom.sys6.1.7600.20575310,27214-Nov-200903:17IA-64
Additional file information for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File namePackage_1_for_kb976187~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,830
Date (UTC)15-Nov-2009
Time (UTC)01:14
PlatformNot Applicable
File namePackage_2_for_kb976187~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,830
Date (UTC)15-Nov-2009
Time (UTC)01:14
PlatformNot Applicable
File namePackage_for_kb976187_rtm~31bf3856ad364e35~x86~~6.1.1.0.mum
File versionNot Applicable
File size1,714
Date (UTC)15-Nov-2009
Time (UTC)01:14
PlatformNot Applicable
File nameX86_cdrom.inf_31bf3856ad364e35_6.1.7600.20575_none_601420a31e3080bb.manifest
File versionNot Applicable
File size2,075
Date (UTC)14-Nov-2009
Time (UTC)07:41
PlatformNot Applicable
Additional file information for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_cdrom.inf_31bf3856ad364e35_6.1.7600.20575_none_bc32bc26d68df1f1.manifest
File versionNot Applicable
File size2,079
Date (UTC)14-Nov-2009
Time (UTC)23:08
PlatformNot Applicable
File namePackage_1_for_kb976187~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size1,840
Date (UTC)15-Nov-2009
Time (UTC)01:14
PlatformNot Applicable
File namePackage_2_for_kb976187~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size1,840
Date (UTC)15-Nov-2009
Time (UTC)01:14
PlatformNot Applicable
File namePackage_for_kb976187_rtm~31bf3856ad364e35~amd64~~6.1.1.0.mum
File versionNot Applicable
File size1,724
Date (UTC)15-Nov-2009
Time (UTC)01:14
PlatformNot Applicable
Additional file information for all supported Itanium-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_cdrom.inf_31bf3856ad364e35_6.1.7600.20575_none_6015c4991e2e89b7.manifest
File versionNot Applicable
File size2,077
Date (UTC)14-Nov-2009
Time (UTC)08:05
PlatformNot Applicable
File namePackage_1_for_kb976187~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size1,835
Date (UTC)15-Nov-2009
Time (UTC)01:14
PlatformNot Applicable
File namePackage_for_kb976187_rtm~31bf3856ad364e35~ia64~~6.1.1.0.mum
File versionNot Applicable
File size1,444
Date (UTC)15-Nov-2009
Time (UTC)01:14
PlatformNot Applicable

WORKAROUND

To work around this problem, manually disable the active ALPM power plans on the computer. Then, create a new power plan.

The following table shows the power plans that may exist on your computer:
Existing Power Schemes (* Active)
---------------------------------
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e  (Balanced)
Power Scheme GUID: 447b0505-da3e-40ba-a1af-bc140cbd12c5  (Custom Plan)* 
Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c  (High performance)
Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a  (Power saver)
To determine the power plans on your computer, type the following command at a command prompt, and then press ENTER:
powercfg /l
To manually disable the existing ALPM power plans on the computer, type the following commands at a command prompt, and then press ENTER after each command:
powercfg.exe -setacvalueindex 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c 0012ee47-9041-4b5d-9b77-535fba8b1442 DAB60367-53FE-4fbc-825E-521D069D2456 0

Powercfg.exe -setdcvalueindex 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c 0012ee47-9041-4b5d-9b77-535fba8b1442 DAB60367-53FE-4fbc-825E-521D069D2456 0

Powercfg.exe -setacvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 0012ee47-9041-4b5d-9b77-535fba8b1442 DAB60367-53FE-4fbc-825E-521D069D2456 0

Powercfg.exe -setdcvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 0012ee47-9041-4b5d-9b77-535fba8b1442 DAB60367-53FE-4fbc-825E-521D069D2456 0

Powercfg.exe -setacvalueindex a1841308-3541-4fab-bc81-f71556f20b4a 0012ee47-9041-4b5d-9b77-535fba8b1442 DAB60367-53FE-4fbc-825E-521D069D2456 0

Powercfg.exe -setdcvalueindex a1841308-3541-4fab-bc81-f71556f20b4a 0012ee47-9041-4b5d-9b77-535fba8b1442 DAB60367-53FE-4fbc-825E-521D069D2456 0
To create a new power plan, follow these steps:
  1. Click Start, and then click Control Panel.
  2. Click Power Options.
  3. In the Navigation pane, click Create a power plan.
  4. Select the kind of power plan that you want.
  5. In the Plan name box, type a name for your new power plan, and then click Next.
  6. In the Turn off the display box and in the Put the computer to sleep box, select the options that you want, and then click Create.

STATUS

Microsoft has confirmed that this is a problem in the DVD drive models that are listed in the "Cause" section.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Properties

Article ID: 976187 - Last Review: August 16, 2011 - Revision: 4.0
APPLIES TO
  • Windows 7 Enterprise
  • Windows 7 Enterprise N
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Home Premium N
  • Windows 7 Professional
  • Windows 7 Professional N
  • Windows 7 Starter
  • Windows 7 Starter N
  • Windows 7 Ultimate
  • Windows 7 Ultimate N
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Datacenter without Hyper-V
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Enterprise without Hyper-V
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Standard without Hyper-V
Keywords: 
kbfix kbbug kbexpertiseinter kbsurveynew kbqfe kbautohotfix KB976187

Give Feedback

 

Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from smallbusiness.support.microsoft.com