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I formatted a brand new sandisk usb to ext4 in ubuntu 18.04.2. I have been alternating its use between ubuntu 18.04.3, 64-bit, and debian 10 / armbian, 32-bit. I have been adding files to it until today. 'fdisk -l' is telling me that it is FAT formatted. I am not able to add anymore files.

When I initially formatted it with 'mkfs.ext 4 /dev/sda1', it would not allow me to add any files to it. So I right-clicked on the usb icon in file manager and formatted it by choosing the ext4 format listed there. When I was using the usb in ubuntu originally, I saw a graphical rep of how much space was left, and it showed that it "WAS" ext4.

  • What utility did you use to partition the USB stick? – fpmurphy Aug 15 '19 at 15:21
  • armbian is that on a single board computer and is that one powered by a 5volt adapter, if so can you measure the voltage at the board to see if it is close to 5.0 volts – Bjorn Aug 15 '19 at 15:24
  • @fpmurphy I did not partition the USB. I just formatted to ext4. Thanks. – hddfsck777 Aug 15 '19 at 16:02
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    Fdisk does not know what file system a partition contains. It only displays a hint based on the partition type code, which does not change when a new file system is created with mkfs. You will have to manually keep these in sync. If you formatted the partition to Ext4, I'm pretty sure it still is Ext4. – Johan Myréen Aug 15 '19 at 17:17

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