Zeroing out drives/volumes question in Oracle

I was in a job interview and was thrown a question.
What Oracle command is used to "zeroing out drives", its a db command that works on all versions of Oracle?
I was baffled, so first the term "zeroing out drives" for me has always meant when partitioning drives or creating
volumes especially ones that have been used in the past, one has to clean the existing partition table header and
as well as the rest of the drive to ensure that new data will not be corrupted. For instance in UNIX one can use
the dd command to erase or clean the drive from any old partitions or data. There are other methods of doing this
as well and I am using the terms loosely about... however I know of no command from Oracle that allows me to
"zero a drive" from the database that works across all OS versions of Oracle . I know
that 11GR2 is a completely new GRID infrastructure combining the cluster services and ASM into the directory structure
that combines the clustering services with the ASM and now one can use an ASM volume/filesystem as the voting drive.
To my knowledge a when using a SAN one still has to on the OS level issue a volume manager command or set of
commands to "zero out a drive" ( dd is usually the generic UNIX command employed ) to accomplish this.
Is there a database level command that allows one to "zero out drives" that is universal across all OS versions of
Oracle 10/11G and if so what is it or is the person who asked this question "confused"?

I didn't think so, maybe he meant the gui dbca selecting candidate drives for ASM then again
most of my friends that have been in the business stated this person must be "confused".
Thank you for answering the question.

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