This is the #1 rule. Give the "producer" child their own password-protected Windows or Mac account. This keeps their "song installs" invisible to the younger sibling.
The files aren't actually gone yet. When you "format" a drive, you only erase the address book (the map telling the computer where the song is), not the actual audio data.
: Before recording, agree on how the artist will be compensated: mom he formatted my second song install
It looks like the phrase is likely a typo or auto-correct error. I’ll assume you meant something closer to:
When a file is "formatted" or deleted, it isn't always gone instantly. The computer just marks that space as "available." If they keep downloading new things, they will overwrite the old song files. Turn it off or unplug the drive immediately. This is the #1 rule
Most users keep the base game or software on their primary drive (C:), but because high-quality audio files and custom maps take up massive amounts of space, they often create a "second install" path on a secondary hard drive (D: or E:).
: A one-time payment for the performance (common for established artists). The files aren't actually gone yet
Have a calm conversation with your mom about what happened. Explain how you use your device for music and why it's important to you.