The Book

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