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1 I bought a SanDisk Ultra 16GB 3.0 USB stick, reformatted it to ntfs and "managed" to copy too much data on to it. After that it is undetectable in Ubuntu as well as in Windows (10). I have tried fdisk and its variants, gparted, mkfs, gpart, testdisk and it is no longer detected. Is there a way to make it work? The files on it are still on the disk I copied from so, just make it work again is enough. No need for file recovery. Addition: I tried fdisk -l | grep Disk and when I lost it and still knew the device bound to that stick, I tried to zero it by dd if=/dev/zero of=dev/sdd , which at the time seemed to work but the stick still is undetected. mount ntfs usb-storage share | improve this ques