How can I copy large amount of data between two HD ?

Hello !
Which command could I user to copy large amount of data between two hard disk drives ?
How Lion identify the disk drives when you want to write some script, for example in Windows I sue
Robocopy D:\folder source\Files E:\folder destination
I just want to copy files and if the files/folders exist in destination the files should be overwritted.
Help please, I bougth my first MAC 4 days ago.
Thanks !

Select the files/folders on one HD and drag & drop onto the other HD. The copied ones will overwrite anything with the same names.
Since you're a newcomer to the Mac, see these:
Switching from Windows to Mac OS X,
Basic Tutorials on using a Mac,
Mac 101: Mac Essentials,
Mac OS X keyboard shortcuts,
Anatomy of a Mac,
MacTips,
Switching to Mac Superguide, and
Switching to the Mac: The Missing Manual,
Snow Leopard Edition.&
Additionally, *Texas Mac Man* recommends:
Quick Assist,
Welcome to the Switch To A Mac Guides,
Take Control E-books, and
A guide for switching to a Mac.

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