While installing or updating a game like Dota 2, Fallout 4, Grand Theft Auto V and PlayerUnknown's Battlegrounds, Steam sometimes displays an error message which reads, ' An error occurred while installing/updating (disk write error)'.Ĭommonly known as Steam disk write error, this issue can occur anytime when a game is updated or installed on Steam, leading to Steam being unable to complete the installation. Steam Disk Write Error While Downloading/Installing