Resolving 'Insert Disc 1' Setup Prompts During PCS 7 Installation from USB or Network Shares

In SIMATIC PCS 7 software installations (including PCS 7 V7.1, V8.x, and V9.x), the installer prompts with 'Please insert disc 1' when installation media files are executed from an arbitrary USB drive or network share where the directory folder structure does not follow strict Siemens naming conventions. To resolve this, structure the extracted media into designated folders named DVD_1 and DVD_2 (or CD_1) within a root directory whose complete path length does not exceed 85 characters, or mount the original ISO image directly.

Operating Mechanics of the SIMATIC PCS 7 Media Verification Engine

When installing or upgrading SIMATIC PCS 7 (such as upgrading PCS 7 V7.1 from SP2 to SP4, or deploying PCS 7 V8.x / V9.x), the installation routine is driven by Setup.exe. During initialization, the setup engine scans the storage medium to verify software authenticity, disk volume labels, and prerequisite package integrity across multiple media discs.

If an automation engineer copies installation files from an ISO image or DVD directly onto the root of a USB flash drive or extracts them into an arbitrarily named directory (e.g., D:\Downloads\Siemens_Updates\PCS7_V71_SP4_Setup\), launching Setup.exe frequently halts with an unexpected modal dialog:
Please insert disc 1 and click OK.

This occurs because:
1. Missing Volume Descriptors: The installer checks for an explicit folder hierarchy (DVD_1 and DVD_2) containing media signature files (.inf and .tag descriptors). When files reside in the root or a flattened folder, the signature parser fails.
2. Windows 85-Character Path Length Limit: The internal setup routines in STEP 7 and WinCC utilize legacy Windows API string buffers with an absolute ceiling of 85 characters for the total installation path. If the directory path on the USB drive or network share exceeds 85 characters, the installer cannot locate its own payload files, prompting the user for Disc 1.

Installation Media Directory Structure and Path Constraints Matrix

Review the mandatory directory structures and technical requirements for offline installation media:

Installation MethodRequired Root Folder NameSubfolder Naming RequirementsMaximum Path LengthCommon Failure TriggerDual-DVD PCS 7 InstallationArbitrary Short Name (e.g., C:\PCS7_Setup\)DVD_1 and DVD_2 under root85 characters totalFlattening DVD contents into a single directorySingle-CD / Service Pack UpdateShort Name (e.g., C:\SP4_Update\)CD_1 or DVD_185 characters totalRunning directly from deeply nested download foldersNetwork Share (UNC Path)\\ServerName\PCS7_Share\DVD_1 and DVD_285 characters totalSpaces, non-ASCII characters, or mapped drive latencyVirtual ISO MountVirtual Optical Drive (e.g., E:\)Native ISO rootN/A (Standard ISO 9660)Unmounting during reboot cycles

System installation rule: Never execute PCS 7 setup routines from temporary zip extraction folders.

Configuring Standard DVD_1 and DVD_2 Folder Hierarchies on USB Drives

Follow this verified procedure to prepare USB installation media:

Format USB Media with NTFS:
* Format the USB flash drive (minimum 32 GB) using the NTFS file system (FAT32 has a 4 GB file size limit which corrupts large WinCC installation archives).
Create Standardized Short Folder Hierarchy:
* In the root of the USB drive (e.g., E:\), create a top-level directory with a concise name:
E:\PCS7_V714\
* Inside E:\PCS7_V714\, create the mandatory disc subfolders:
- E:\PCS7_V714\DVD_1\
- E:\PCS7_V714\DVD_2\ (if dual-disc delivery)
Copy Files into Designated Subfolders:
* Extract or copy the contents of Disc 1 directly into E:\PCS7_V714\DVD_1\.
* Extract or copy the contents of Disc 2 directly into E:\PCS7_V714\DVD_2\.
* Ensure Setup.exe resides in E:\PCS7_V714\DVD_1\Setup.exe.
Execute Setup with Administrative Privileges:
* Open E:\PCS7_V714\DVD_1\.
* Right-click Setup.exe and select Run as Administrator.
* The setup engine recognizes the unified disc structure and transitions smoothly without prompting for Disc 1.

Alternative Deployment: Virtual ISO Mounting and Network Share Distribution

If working in virtualized environments or enterprise network deployments:
1. Virtual ISO Mounting:
* Instead of extracting the ISO files onto a USB drive, copy the raw .iso image directly to the workstation.
* Mount the ISO as a virtual CD/DVD drive (using native Windows 8/10/Server ISO mounting, or tools like PowerISO / WinCDEmu on Windows 7).
* Launch Setup.exe from the virtual drive letter. The operating system handles volume label queries natively.
2. Network Share Distribution:
* Share the root directory (\\FileServer\PCS7_Media\) with read permissions for Everyone or domain engineering accounts.
* On the target workstation, map the share to a dedicated drive letter (e.g., Z:\) to keep the path length well below the 85-character threshold:
cmd net use Z: \\FileServer\PCS7_Media Z:\DVD_1\Setup.exe

Verification

Verify installation startup:
1. Launch Setup.exe as Administrator.
2. The Siemens installation wizard initializes, performs system prerequisite checks (operating system compatibility, SQL prerequisites), and presents the package selection menu.
3. Confirm that the setup progresses past component verification into active file copying without displaying any 'Insert Disc 1' prompts.

Limitations and Operational Precautions

Never attempt to install PCS 7 over an active wireless (Wi-Fi) network share; transient packet drops can corrupt installation DLLs, leading to unhandled runtime exceptions during OS compilation.
Disconnect all unnecessary USB peripherals and ensure Windows Update is not running background servicing in the taskbar before launching setup.
If a system restart is requested midway through installation, do not remove the USB drive or unmount the virtual ISO drive until the final setup summary confirms complete success.

Engineer FAQ

Why does the installer enforce an 85-character path length limit?

Certain legacy STEP 7 and Microsoft installer subroutines use fixed-length 128-byte character buffers. Including internal subfolder names and file extensions within that buffer restricts the root path to a maximum of 85 characters.

Can I install PCS 7 V7.1 on Windows 10?

No. PCS 7 V7.1 is officially qualified only for Windows XP SP3, Windows Server 2003, and Windows 7 SP1 (with specific service packs). Refer to the Siemens Compatibility Tool.

What should I do if Setup prompts for Disc 2 midway through installation?

If the folders 'DVD_1' and 'DVD_2' are placed side-by-side in the same parent directory, Setup transitions automatically. If prompted, browse to the 'DVD_2' folder and click OK.