When I go to Gparted and try to format my pendrive to exfat,the option is greyed out and I am not able to select it however I can choose other file systems such as ext4,ntfs,etc. Why is that ?
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Gparted doesn't support creation of exfat file systems. You can use
mkfs.exfat utility from the terminal like:
sudo mkfs.exfat -n LABEL /dev/sdXn
LABEL with the label that you want for your USB and
/dev/sdXn with the partition id of your USB.
You will have to install
exfat-fuse from the universe repository for the above to work;
sudo apt-get install exfat-utils exfat-fuse
This is the default pre-installed disk manager tool on Ubuntu that shows on the Dash as "Disks".
You can also launch if from the terminal with:
Ensure that you have the exfat backend installed:
sudo apt install exfat-utils
Then as of Ubuntu 18.04:
The GUI was a bit different in older versions: GUI tool for formating to exFAT
This is the only non-archaic filesystem I could find that works natively on all of current Mac OS, Windows and Linux, what a world to live in.
While Gparted cannot handle exFAT format, beside other tools that can (Gnome Disks, KDE Partition Manager), there is also the USB Stick Formatter, part of the
mintstick tool (which includes both an USB Formatter and an USB Writter), and it covers exFAT format.