msdia80.dll

The msdia80.dll file is a Microsoft component associated with Visual C++ 2005 Redistributable. Users have reported this file appearing on external or secondary hard drives after Windows updates, often locked by the system and difficult to delete. This typically occurs when the drive is connected during a Windows update or software installation that includes the Visual C++ runtime. While the file itself is legitimate, its unexpected placement on non-system drives can be confusing. The recommended fix involves safely removing the file using disk cleanup or by taking ownership and deleting it, though caution is advised to avoid system file corruption.