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I have a USB stick which I recently used to dd an iso to it so that I could use that stick as a booting drive. Now, I would like to store regular files there.

When using parted I constantly get this message:

Warning: /dev/sdb contains GPT signatures, indicating that it has a GPT table. However, it does not have a valid fake msdos partition table, as it should. Perhaps it was corrupted -- possibly by a program that doesn't understand GPT partition tables. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Is this a GPT partition table? Yes/No? yes

Error: Both the primary and backup GPT tables are corrupt. Try making a fresh table, and using Parted's rescue feature to recover partitions.

I am searching for how can I make a fresh table with parted but I cannot find it. I would like to remove everything in that drive, create just one partition and use ext4 file system to be able to store files. Is that not possible with GNU parted?

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2 Answers 2

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The command you are looking for is mklabel. From the gparted help menu:

mklabel,mktable LABEL-TYPE               create a new disklabel (partition table)

To create an MBR/msdos partition table, at the (parted) prompt, just use:

(parted) mklabel msdos
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I don't know if such an option exists in parted, but at least you can zero the GPT headers by using dd if=/dev/zero of=/dev/sdX bs=1M, where sdX is the device name for the USB stick. This will write zeroes to first 1MB of the USB stick, after which you should be able to use parted.

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