That will write zero's from the start of the drive to the end of the drive, obviously you will have to change the sdX to whatever the drive has been allocated by the operating system, and I cannot say enough how RIGHT you have to be about the correct /dev/sdX.
In linux it's relatively easy with the following these days it's all automated and hard disks have spare cylinders which allow you to map out the bad sectors and give the impression of a defect free hard disk.the truth of the matter is though that all disks have defects and bad sectors.when a drive develops a bad sector that cannot be corrected by ECC it won't map it out until the sector is written again and fails on a write command.there are various ways to do this. Modern SATA and IDE disks are not perfect, in the old days the defect list was printed on a label on the drive and you had to laboriously type in the defects head/cylinder/sector.
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