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Hello,
I created my own bootable boot sector at the USB stick a long while ago, but I created it without the boot record (I hard coded the next sectors), so right now when I plug it into the Ubuntu, it do not even show it as the block device. Does someone know which tool could I use to format this drive?
randomname

If you have access to a Windows machine the hp usb formatting tool should repair it (worked for me in the past).

Are you sure it's not appearing as a /dev/sd* block device with no partitions? I can't think of any reason why it wouldn't...

If it happens to be showing up like that, use something like fdisk or parted to create a new MBR.