Understanding AeroSimulations Storage Demands in Prepar3D

Installing AeroSimulations content into Prepar3D can quickly consume significant disk space. A single high-fidelity aircraft package or complex airport scenery often exceeds several gigabytes. When you add updates, liveries, navigation data, and supporting libraries, total storage usage can grow unexpectedly. Without proactive management, you risk running out of space, which can cause installer failures, texture streaming issues, and performance degradation.

This guide covers practical strategies to keep your storage under control while maintaining a robust Prepar3D installation. These methods apply whether you use a traditional hard disk drive (HDD) or a solid-state drive (SSD).

Initial Planning: Know Your Baseline

Checking Available Space

Before installing any AeroSimulations package, open Windows File Explorer and review the free space on your target drive. Right-click the drive and select Properties. A good rule of thumb is to have at least 50 GB of free space beyond your estimated installation size. This buffer accommodates temporary extraction files, downloads, and future updates.

Estimating Package Sizes

AeroSimulations does not always publish exact final sizes because dependencies can vary. However, you can approximate by looking at the download file size. Compressed archives typically expand to 1.5 to 3 times their compressed size. For multi-GB packages, plan for the higher end of that range. If a product requires additional libraries (like Orbx, FSDT, or GSX), factor in their space requirements too.

Drive Type Considerations

SSD vs. HDD: While SSDs offer much faster load times for scenery and aircraft, they are more expensive per gigabyte. Many flight sim enthusiasts install Prepar3D and high-priority AeroSimulations content on a fast SSD, while using a secondary HDD for add-ons that are less performance-sensitive. If you have only one drive, partition it so your OS and crucial apps remain separate from bulky add-on data. This isolation helps prevent OS slowdowns when the simulation drive approaches capacity.

Best Practices for Day-to-Day Storage Management

Install to a Dedicated Drive

Never install AeroSimulations content on your system drive (normally C:) unless absolutely necessary. Use a separate physical drive or a dedicated partition. This practice prevents the P3D core files from competing for space with add-on data, and makes it easier to back up or migrate your simulator later.

During installation, AeroSimulations installers typically ask for a target path. Set it to a folder like D:\Aerosim or E:\Prepar3D Addons. Keep all add-ons under a single parent directory to simplify cleanup.

Use Disk Cleanup Utilities Regularly

Windows Disk Cleanup (accessible by typing “Disk Cleanup” in the Start menu) can remove temporary files, recycle bin contents, and previous Windows update files. Run it monthly to reclaim gigabytes of space that might otherwise be wasted.

For deeper analysis, consider third-party tools like WinDirStat or TreeSize Free. These scan your drive and visually display which folders consume the most space. You can quickly spot hidden logs, backup files, or orphaned installer caches left by AeroSimulations updates.

Keep an Organized Folder Structure

A well-organized file system makes it easy to identify and delete unused content. For example:

  • \AeroSim\Aircraft\
  • \AeroSim\Scenery\
  • \AeroSim\Libraries\
  • \AeroSim\Utilities\

When you remove an aircraft, ensure you delete its entire folder from both the SimObjects\Airplanes and AeroSim\Aircraft locations. Some installers also place files in %APPDATA% or Documents\Prepar3D v5 Add-ons. Check those locations as well.

Archive Instead of Delete

If you are unsure whether you will use an older aircraft or scenery again, archive it rather than deleting it permanently. Compress the entire add-on folder using 7-Zip or WinRAR and store the archive on an external USB drive or cloud storage. This keeps your active installation lean while preserving the ability to restore the content later without re-downloading.

Advanced Storage Techniques

Sometimes an AeroSimulations installer forces a specific folder path inside the main Prepar3D directory. If that drive runs low on space, you can use symbolic links (symlinks) to redirect that folder to another drive. Windows supports this natively via the mklink command. For example:

mklink /J "C:\Program Files\Lockheed Martin\Prepar3D v5\SimObjects\Airplanes\MyAircraft" "D:\AddonStorage\MyAircraft"

This makes the simulator think the folder exists on C: while the actual data resides on D:. Use symlinks carefully—always back up the original folder before moving it, and avoid creating loops.

Managing Texture and Model Compression

AeroSimulations content often contains high-resolution textures (4096x4096 or larger). If you are not using a 4K monitor, you can reduce texture size using tools like DXTBmp or ImageTool. Downsizing textures from 4096 to 2048 can cut file sizes by 75% with minimal visual difference in standard views. Similarly, compress DDS files to DXT1 (for opaque surfaces) or DXT5 (for alpha transparency) to save additional space.

Note: Modifying textures may violate the license of some add-ons. Check the EULA before making changes. For personal use, this is generally acceptable if you keep backups.

Handling Updates and Add-on Proliferation

Selective Update Installation

Not every AeroSimulations update is essential. Review changelogs on the developer’s website before downloading. If the update fixes a bug you have not encountered or adds features you do not need, consider skipping it. Sticking with a stable version can save significant download and disk space over time.

Clean Old Update Installers

When you download an update installer, it usually stays in your Downloads folder. After you have successfully installed the update, delete the installer file. These .exe or .zip files can easily accumulate to 20–50 GB across many products.

Regularly Audit Your Installed Add-ons

Every six months, review your Prepar3D add-on list. Remove any scenery, aircraft, or utilities you have not used in the last 90 days. Uninstall them via the AeroSimulations control panel or the installer’s uninstall feature, then manually check for leftover folders, registry entries, and XML configuration files in the Prepar3D v5 Add-ons folder. Safe removal frees space and reduces the chance of conflicts.

Backup and Migration Strategies

Creating a Compressed Backup of Your Simulator

Before making major storage changes (like moving to a new drive), create a compressed backup of your entire Prepar3D directory and your AeroSimulations add-on folders. Use 7-Zip with the LZMA2 algorithm for best compression. A typical 200 GB installation can shrink to 120 GB or less. Store this backup on an external HDD. This allows you to restore everything without re-downloading if something goes wrong.

Using Cloud Storage for Archives

If you have a cloud subscription (Google Drive, OneDrive, or Dropbox), upload archived add-on packages. This is especially useful for infrequently used content. Cloud storage provides off-site redundancy and does not consume your local drives. However, download speed may be a factor if you need to quickly restore an archive.

Monitoring and Alerts

Setting Up Disk Space Alerts in Windows

Windows can notify you when free space on a drive drops below a certain threshold. Open Settings → System → Storage, and toggle on Storage Sense. Configure it to automatically clean up temporary files and recycle bin contents. You can also use third-party tools like SpaceSniffer to set real-time alerts.

Using Performance Monitor (PerfMon)

For advanced users, Windows Performance Monitor can track free space as a counter. Create a data collector set that logs free space on your Prepar3D drive every hour. When space drops below a chosen value (e.g., 10 GB), the monitor can trigger a notification. This proactive approach prevents surprise out-of-disk errors during a flight.

Specific AeroSimulations Considerations

Some AeroSimulations products integrate closely with Prepar3D’s core files. For instance, a complex avionics suite might add files to the Gauges folder, while a high-definition airport might add vector data to Scenery\World. Always read the installation manual: it often lists exact file paths and sizes. If you uninstall one product and later see disk space not returning, check for leftover files in these system folders.

Another tip: AeroSimulations installers sometimes create backup copies of overwritten files (e.g., *.bak). These can accumulate over many updates. Search your entire Prepar3D directory for *.bak files and delete them if you do not need to roll back an update.

Conclusion

Effective storage management for AeroSimulations content in Prepar3D is about foresight and routine maintenance. Plan your drive layout before installing, use dedicated drives or partitions, monitor free space regularly, and adopt a habit of archiving rather than hoarding. By combining basic Windows tools with third-party analysis utilities and a structured folder organization, you can keep hundreds of gigabytes of add-on data under control. Your simulator will run smoother, your drive will last longer, and you will never be caught off guard by a low disk space error mid-approach.