Format a USB Drive for Mazda Connect: FAT32 and MBR

Use an empty 8–32 GB USB-A flash drive. Formatting erases every file on the drive.

File system. FAT32. exFAT and NTFS do not work.
Partition table. MBR. GPT does not work.
Partition layout. One partition.
Connection. Plug the drive directly into the car’s USB-A port. Do not use a hub or extension cable.

Windows: format in File Explorer, copy, and eject

Format the drive

Use an 8–32 GB drive so Windows 10 and 11 offer FAT32 in File Explorer.

Insert the USB drive.
Open File Explorer → This PC.
Right-click the USB drive, then select Format.
Set File system to FAT32.
Leave Allocation unit size at Default allocation size.
Select Quick Format.
Select Start.

If FAT32 is not listed, use an 8–32 GB drive instead of repartitioning a larger drive.

Check MBR on a reused drive

File Explorer changes the file system but leaves the existing partition table in place. Check the partition table if the drive was previously used as bootable media or the car does not recognize it.

Right-click Start, then select Disk Management.
Find the USB drive by its capacity.
Right-click the disk label on the left, such as Disk 2, then select Properties → Volumes.
Check Partition style. If it says Master Boot Record (MBR), no changes are required.
If it says GUID Partition Table (GPT), follow Microsoft’s Disk Management instructions to convert it to MBR. Conversion erases every volume on the selected disk.
Create one new simple volume, select FAT32, and use Quick Format.

Copy and eject

Copy the installation or update files to the USB drive exactly as instructed with your download. Do not rename or reorganize them.
Eject the drive from Windows, then unplug it.
Plug the drive directly into the car’s USB-A port.

macOS: format, copy, clean, and eject

Format the drive

Use Apple’s Disk Utility.

Insert the USB drive and open Disk Utility.
Select View → Show All Devices.
Under External, select the USB drive itself. Choose the top-level device, not the indented volume below it.
Select Erase.
Enter any name, such as MIATAFY.
Set Format to MS-DOS (FAT).
Set Scheme to Master Boot Record.
Select Erase, then Done.

If you do not see the Scheme menu, return to step 2 and select the top-level USB device.

Copy, clean, and eject

macOS writes .DS_Store, ._*, and indexing data to FAT32 drives. A ._*.up sidecar can make the update scanner see an unexpected update file.

The cleanup and eject must run together because macOS can recreate the hidden files while the drive remains connected.

Copy the installation or update files to the USB drive exactly as instructed with your download. Do not rename or reorganize them.
Close any Finder window showing the USB drive.
Open Terminal from Applications → Utilities.
Copy the entire command below, paste it into Terminal, then press Return:
Terminal window
```
curl -fsSL https://miatafy.com/downloads/miatafy-macos-clean-eject.sh | sh
```
Wait for Done. The USB drive is safe to remove. The helper has now ejected the drive.
Unplug the USB drive, then plug it directly into the car’s USB-A port.

Run the command again whenever you copy or change files on the drive. The helper refuses to run unless it finds one external, ejectable drive containing a Mazda Connect installation or update marker.

Linux: use one FAT32 partition on MBR

Create an MBR/DOS partition table with one partition. Format that partition as FAT32. Copy the supplied files without renaming or reorganizing them, then unmount the drive before unplugging it.

If the car still does not recognize the drive, try another 8–32 GB flash drive and see USB not working.