Two basic, related questions about external HDs and trashing/erasing

I have a couple of questions about using an external hard drive that I can't seem to get answered by surfing around. They'll probably seem stupid and basic, but ... Here they are:
1. When you drag a file from your external hard drive to the trash, does that file actually transfer to the main hard drive's trash, and thus the main hard drive? For instance, say I'm deleting a 4 GIG file. Will I temporarily add 4 GIGs to my main drive in the process of deleting it?
2. With a multipartitioned ext. drive, can you erase the contents of a single partition with the disk utility, thus bypassing having to drag-trash everything on that partition?
Thanks.
G5 iMac   Mac OS X (10.4.2)   Powerbook (10.4.6)

1. No. The files are moved to an invisible .Trash directory on the external volume. No copying of data takes place between volumes when you move stuff to the trash.
2. Yes. You can use Disk Utility to erase or securely erase just a single Volume on a disk, leaving the other volumes unaffected. Simply click on the name of the Volume in the left pane of Disk Utilitly, click on the Erase tab in the right pane, and choose the options you want for erasing the volume.

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