TRACKTUNE
Make a recording stick
Your drive, ready to explore. Choose your exports, add the metrics you care about, and save one file to your USB stick.
Recording needs Meters or 10 Hz GPS
The car records with FastData, which comes with Meters or with the 10 Hz GPS setting, both included with ScreenTune at no extra charge. Add one to this car, install the new package, then make a recording stick here.
READY FOR YOUR USB
Your recording setup
Made in your browser. It holds no personal data and works in any car with Meters or 10 Hz GPS on ScreenTune 1.2.0 or later.
Copy miatafy.json to the top level of a separate FAT32 stick.
View configuration file
{"version":1,"fastdata":{"outputs":[{"format":"csv"},{"format":"vbo"},{"format":"gpx"},{"format":"racechrono"}]}}
04 / PLUG IN & RECORD
Set up the stick and record
- Install ScreenTune 1.2.0 or later with Meters or 10 Hz GPS first. Until it’s on the car, the car doesn’t look for a recording stick, so a stick records nothing and shows no error. Update ScreenTune.
- Use a second USB stick, formatted FAT32. Format it as on the USB requirements page: FAT32, MBR, one partition.
- Keep it off your ScreenTune install USB. The car starts recording onto any stick with this file, so on the install USB it would record onto the installer.
- Put
miatafy.jsonat the top level of the stick, not inside a folder. The name has to be exactlymiatafy.json. If your browser saved it asmiatafy (1).json, delete the old file and rename the new one. Windows hides the.json, so type onlymiatafy: typingmiatafy.jsonmakesmiatafy.json.json, which the car ignores. On a Mac, clean and eject it. - Start the car, then plug the stick in. Use a media/data USB port. Recording starts within about a second of the car mounting the stick, or once the car has finished starting up if the stick was already in.
- Check that it’s recording. A Drive recorder TrackTune widget on your Meters dashboard shows
RECwith the time recorded andSTICKwith the size.BAD CONFIGmeans the car ignored the file’s settings and is recording only the JSONL file; open the widget to see why.CONFIG UNREADABLEmeans it couldn’t read the file at all and nothing records: download it again here. - Stop before you pull it. Press Stop & Save twice on the recorder widget, or switch the car off. Pulling the stick while it records loses up to about 5 s and leaves the open files named
.partial.
Where the recordings are
Each drive gets its own folder. With the default settings, it’s inside MIATAFY; the example shows its date and drive ID: 2026-10-23/2026-10-23_143005. A custom folder above changes its location. The car’s clock can read 1970 until it has GPS or network time, so a folder can be named unknown-date.
A long drive splits into -0001, -0002 and so on. The recording stick guide covers what each file holds and how to open it in RaceChrono, Circuit Tools and RaceRender.