Also, considering the "top" aspect, maybe they want the best practices for installing games via USB, such as defragmenting the USB drive, using AHCI mode for USB connections, or even converting NTFS to exFAT if needed.

I should also think about game-specific issues. Some games might have specific requirements that conflict with external storage. For example, Steam games can be installed on external drives, but some components might be on the system drive. The user might need to configure the game to install all components on the USB HDD.

Also, considering permissions—running the installer as administrator might help if there are access issues. Another thing is driver updates for the USB ports to ensure compatibility and speed.

I should consider common issues when installing games from USB drives. USB drives have slower read/write speeds compared to internal HDDs, so maybe performance settings or preparing the USB properly are important. Also, ensuring the USB is formatted correctly, has enough space, and is not fragmented.