Merge pull request #107776 from Ekta-Microsoft/patch-5

Update generalize.md

Author: Jak-MS

articles/virtual-machines/generalize.md

@@ -81,8 +81,10 @@ Make sure the server roles running on the machine are supported by Sysprep. For
 >
 > If you plan to run Sysprep before uploading your virtual hard disk (VHD) to Azure for the first time, make sure you have [prepared your VM](./windows/prepare-for-upload-vhd-image.md).  
 > 
-> We do not support custom answer file in the sysprep step, hence you should not use the "/unattend:_answerfile_" switch with your sysprep command.
-> 
+> We do not support custom answer file in the sysprep step, hence you should not use the "/unattend:_answerfile_" switch with your sysprep command.  
+>  
+> Azure platform mounts an ISO file to the DVD-ROM when a Windows VM is created from a generalized image. For this reason, the **DVD-ROM must be enabled in the OS in the generalized image**. If it is disabled, the Windows VM will be stuck at out-of-box experience (OOBE).
+
 
 To generalize your Windows VM, follow these steps:
 
@@ -91,6 +93,13 @@ To generalize your Windows VM, follow these steps:
 2. Open a Command Prompt window as an administrator. 
 
 3. Delete the panther directory (C:\Windows\Panther). 
+4. Verify if CD/DVD-ROM is enabled.If it is disabled, the Windows VM will be stuck at out-of-box experience (OOBE).  
+```
+   Registry key Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\cdrom\start (Value 4 = disabled, expected value 1 = automatic) Make sure it is set to 1.
+   ```
+> [!NOTE]
+   > Verify if any policies applied restricting removable storage access (example: Computer configuration\Administrative Templates\System\Removable Storage Access\All Removable Storage classes: Deny all access)
+
 
 5. Then change the directory to %windir%\system32\sysprep, and then run:
    ```