If you replace the device name, you can also wipe USB sticks and other peripherals. Use for example gparted to find the correct drive. sda is usually the first hard drive, the second drive would be sdb and so on. Important Note: You need to replace sdX with the device name you want to overwrite. The reason one should fill with urandom in case of required security is explained here: If you are wiping your hard drive for security, you should populate it with random data rather than zeros (This is going to take even longer than the first example.) : dd if=/dev/urandom of=/dev/sdX bs=1M #replace X with the target drive letter.Filling the disk with all zeros (This may take a while, as it is making every bit of data 0) : dd if=/dev/zero of=/dev/sdX bs=1M #replace X with the target drive letter.This will overwrite all partitions, master boot records, and data.
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