How Do I Do If Data Disks of a Windows Desktop Cannot Be Found After Recomposing the System Disk?

Scenario

The SAN policy of some Windows OSs is not OnlineAll. As a result, data disks cannot be found after you recompose the system disk. You need to change the disk status from offline to online so that the data disks can be properly displayed on the desktop.

Procedure

Checking the disk status

1. Log in to the desktop whose system disk has been recomposed.
2. Press Win+R and enter cmd to run cmd.exe.
3. Run the following command to access DiskPart:

   diskpart

4. Run the following command to check the disk status on the desktop:

   list disk

   Figure 1 shows the command output.

   Figure 1 Disk status
   
   • If any disk is in the Offline status, go to 5.
   • If no disk is in the Offline state, run the exit command to exit DiskPart and close cmd.exe.

Changing the disk status

5. Run the following command to select the disk in the offline status:

   select disk 1

   The information about the selected disk is displayed. Disk 1 is now the selected disk.

   Change the disk number based on the actual offline disk. For example, if disk 1 is offline in Figure 1, the actual command is select disk 1.

6. Run the following command to change the offline disk status to online:

   online disk

   A message is displayed, indicating that the modification is successful. DiskPart successfully brings the selected disk online.

7. Run the exit command to exit DiskPart and close cmd.exe.