Open Command Prompt (cmd) as Admin.
Run Diskpart:
C:\WINDOWS\system32>diskpart
List disks:
DISKPART> list disk Disk ### Status Size Free Dyn Gpt -------- ------------- ------- ------- --- --- Disk 0 Online 298 GB 7168 KB Disk 1 Online 931 GB 0 B Disk 2 Online 1862 GB 0 B Disk 3 Online 7702 MB 0 B
Select the required disk:
DISKPART> select disk 3 Disk 3 is now the selected disk.
Make it read only:
DISKPART> attributes disk set readonly Disk attributes set successfully. DISKPART> exit Leaving DiskPart...
To clear the read-only attribute:
attributes disk clear readonly
Note that the readonly bit is not absolute. Viruses can ignore the bit.
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