It uses the Mac format to protect the integrity of the hierarchical file system. This is the recommended file system for devices that are used with Macbooks. Unless a system specifically calls for FAT32 devices, avoid this format at all costs. For example, you can only store files that are less than 4GB on the device. This file format is highly compatible but somewhat limiting. This file format is compatible with multiple devices, like PCs and gaming consoles. If you plan on using your USB on both Windows and macOS devices, the preferred format is ExFAT. Different File System Formats Available in Disk Utility ExFAT
Let’s look at how to format your thumb drive for a Mac. Unless it’s specifically designed to work on a macOS, you'll need to reformat the flash drive. It’s because most computers run on Windows and most thumb drives ship with formats that favor a Windows environment. Thus, you must specify the case-insensitive full name "ms-dos fat32".Have you ever tried to use a USB drive on your Mac only to realize you couldn’t write any files to it?
In the output table you will see that there are aliases defined by "(or) something" but there is no alias for the "FAT32" filesystem. you should know from other answers when to use sudo, how to identify your device, how to unmount your device, how to specify the label and how to verify that the disk is formatted correctly.ĭiskutil eraseDisk filesystem disklabel MBRFormat deviceįind the correct filesystem alias by listing all available options: I will not elaborate on every bit of information, just what changes need to be made to your command e.g.You need to determine what is the pointer to your device. In the following examples, /dev/disk1 points to the SD card (device).This solution is not relevant for newer Mac OS versions, perhaps El Capitan 10.11 and onwards.The error may occur from Mac OS Leopard 10.5 to Yosemite 10.10.I am not sure which "older" versions produce the error, but it does occur in Snow Leopard 10.6.8 with diskutil version dated.This is an alternate solution for older Apple Mac versions where FAT32 as the filesystem type does NOT WORK as per the error above.Use diskutil listFilesystems to view a list of supported file systems $diskutil eraseDisk FAT32 MYDISKLABEL MBRFormat /dev/disk1įAT32 does not appear to be a valid file system format
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