How to erase MBR in Linux

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Question: How do I remove a third party boot loader from the MBR

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 Answer:

Erase the first 512 bytes of the harddrive to remove the bootloader
Erase MBR Using a linux boot cd:

# dd if=/dev/zero of=/dev/sda1 bs=512 count=1

Please  check  about your  hard disk  (HDA or  SDA)