I have several USB memory sticks with clobbered partition tables (MBR). When I insert them, they are recognized by Linux as USB mass storage devices, but not as block devices, and I haven't found any char devices yet.

Is there any program that will allow me to write a new MBR on the USB device? Since they are not recognized as block devices, gdisk, fdisk, gparted can't do so.

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    I have no idea if this will work, so I'm going to say this anyway, try giving MiniTool Partition Wizard a shot and use the rebuild MBR function. Let me know if this works for you - they have a bootable version in case you can't install the windows application. – Tom Mar 26 '17 at 14:05
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    Please include what dmesg | tail says when one these memory sticks is inserted. – agc Apr 4 '17 at 17:50

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