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I've tried with Disks and GParted. After both the partitions simply reappear with no error:

I've used fdisk with the options o, n, t, c, wq and it didn't format and gave no error.

I have used Apple Disk Utility and that didn't work.

I have tried erasing the whole disk with this command:

sudo dd if=/dev/zero of=/dev/sdd bs=1M

and the partitions are still there. How can I remove them?

Tim
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  • Memory cards and USB pendrives have the same kind of hardware inside, so the same methods are relevant to both kinds of devices. It seems to me that the [original] partitions are shown also after reboot. If that is the case, I think the drive is 'gridlocked', that the SD card can be read but not written to. It is a first stage of failure. You can find more detailed information via the following links, https://askubuntu.com/questions/22381/how-to-format-a-usb-flash-drive/911791#911791 and http://ubuntuforums.org/showthread.php?t=2196858&p=13199297#post13199297 – sudodus Jul 07 '17 at 17:44
  • I responded with a detailed answer to your other current call, 'hunting your bounty' ;-) , https://askubuntu.com/questions/144852/help-me-i-cant-format-my-usb-i-have-already-tried-with-mkdosfs-and-gparted/933035#933035 – sudodus Jul 07 '17 at 21:12

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