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=supportNote 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

File name

File version

File size

Date

Time

Platform

Cdrom.sys

6.1.7600.20575

108,544

14-Nov-2009

03:35

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Cdrom.sys

6.1.7600.20575

147,456

14-Nov-2009

03:50

x64

For all supported Itanium-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Cdrom.sys

6.1.7600.20575

310,272

14-Nov-2009

03:17

IA-64

Additional file information for all supported x86-based versions of Windows 7

File name

Package_1_for_kb976187~31bf3856ad364e35~x86~~6.1.1.0.mum

File version

Not Applicable

File size

1,830

Date (UTC)

15-Nov-2009

Time (UTC)

01:14

Platform

Not Applicable

File name

Package_2_for_kb976187~31bf3856ad364e35~x86~~6.1.1.0.mum

File version

Not Applicable

File size

1,830

Date (UTC)

15-Nov-2009

Time (UTC)

01:14

Platform

Not Applicable

File name

Package_for_kb976187_rtm~31bf3856ad364e35~x86~~6.1.1.0.mum

File version

Not Applicable

File size

1,714

Date (UTC)

15-Nov-2009

Time (UTC)

01:14

Platform

Not Applicable

File name

X86_cdrom.inf_31bf3856ad364e35_6.1.7600.20575_none_601420a31e3080bb.manifest

File version

Not Applicable

File size

2,075

Date (UTC)

14-Nov-2009

Time (UTC)

07:41

Platform

Not Applicable

Additional file information for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_cdrom.inf_31bf3856ad364e35_6.1.7600.20575_none_bc32bc26d68df1f1.manifest

File version

Not Applicable

File size

2,079

Date (UTC)

14-Nov-2009

Time (UTC)

23:08

Platform

Not Applicable

File name

Package_1_for_kb976187~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not Applicable

File size

1,840

Date (UTC)

15-Nov-2009

Time (UTC)

01:14

Platform

Not Applicable

File name

Package_2_for_kb976187~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not Applicable

File size

1,840

Date (UTC)

15-Nov-2009

Time (UTC)

01:14

Platform

Not Applicable

File name

Package_for_kb976187_rtm~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not Applicable

File size

1,724

Date (UTC)

15-Nov-2009

Time (UTC)

01:14

Platform

Not Applicable

Additional file information for all supported Itanium-based versions of Windows Server 2008 R2

File name

Ia64_cdrom.inf_31bf3856ad364e35_6.1.7600.20575_none_6015c4991e2e89b7.manifest

File version

Not Applicable

File size

2,077

Date (UTC)

14-Nov-2009

Time (UTC)

08:05

Platform

Not Applicable

File name

Package_1_for_kb976187~31bf3856ad364e35~ia64~~6.1.1.0.mum

File version

Not Applicable

File size

1,835

Date (UTC)

15-Nov-2009

Time (UTC)

01:14

Platform

Not Applicable

File name

Package_for_kb976187_rtm~31bf3856ad364e35~ia64~~6.1.1.0.mum

File version

Not Applicable

File size

1,444

Date (UTC)

15-Nov-2009

Time (UTC)

01:14

Platform

Not 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.

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