The Book

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==== Offline Disk in Windows ====

Offline Disk in Windows

Message
  Offline (The disk is offline because of policy set by an administrator)

Solution:

1. Open cmd.exe\\
2. Start diskpart\\
3. To check the policy status:\\

  DISKPART> san
  
  SAN Policy  : Offline Shared

4. If it is Offline Shared, type:

  DISKPART> san policy=onlineall
  
  DiskPart successfully changed the SAN policy for the current operating system.

5. To see which disk is offline, type:
  DISKPART> list disk
  
  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
  Disk 0    Online           50 GB      0 B
  Disk 1    Online          350 GB  1024 KB
  Disk 2    Online          500 GB  1024 KB
  Disk 3    Offline         150 GB   150 GB
  Disk 4    Offline         150 GB   150 GB
  
6. Select disk and clear attributes:
  
  DISKPART> select disk 3
  
  Disk 3 is now the selected disk.
  
  DISKPART> attributes disk clear readonly
  
  Disk attributes cleared successfully.

7. Check attributes:

  DISKPART> attributes disk
  Current Read-only State : No
  Read-only  : No
  Boot Disk  : No
  Pagefile Disk  : No
  Hibernation File Disk  : No
  Crashdump Disk  : No
  Clustered Disk  : No

8. Put the disk online:
  DISKPART> online  disk
  
  DiskPart successfully onlined the selected disk.

9. Check it again:

  DISKPART> san
  
  SAN Policy  : Online All