That would only wipe one partition, not the entire drive.  If you want to erase the entire drive use /dev/sdc (or whatever device).

Also, be aware that unlike hard drives, for flash drives it likely does not "erase" the drive.  Internally the drive might just mark the sectors as all clear and flag the previous contents as erasable without actually clearing the flash.  With a highly over provisioned enterprise drive it may wait to actually clear the flash chips. Not that the original data would be easily accessible (probably have to take the drive apart), but it is something to keep in mind if there is sensitive data...

----- Original Message -----
> From: "ToddAndMargo" <[log in to unmask]>
> To: "Scientific Linux Users" <[log in to unmask]>
> Sent: Saturday, May 17, 2014 12:11:29 AM
> Subject: /dev/zero and flash drives
> 
> Hi All,
> 
> On a flash drive, does the following not only ease the drive,
> but does it also turn off all the charges?
> 
>        dd bs=4096 if=/dev/zero of=/dev/sdc1
> 
> Many thanks,
> -T
> 
> 
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Computers are like air conditioners.
> They malfunction when you open windows
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>