<P> For security reasons, it is sometimes necessary to have a disk wipe of a discarded device . </P> <P> To wipe a disk by writing zeros to it, dd can be used this way: </P> <P> Another approach could be to wipe a disk by writing random data to it: </P> <P> When compared to the data modification example above, notrunc conversion option is not required as it has no effect when the dd's output file is a block device . </P>

What is the use of dd command in linux