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chas_m

 
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Member Since: Jan 22, 2010
Location: Victoria, BC
Posts: 16,672
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Mac Specs: 2012 MBP, Black speakers, Black Benq second monitor, black(ish) iPhone 5s, Black 2012 iPad, etc.

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Disk Utility, already included on both your boot drive and the OS install disk, can do the wipe for you. To invoke Disk Utility from the DVD, just startup from the DVD as though you were going to install from it, but AFTER the first question about what language you're using, ignore the next screen and look in the menubar, there will be a command for Disk Utility. Open it, pick the drive, choose erase then choose advanced.

As for your second question, holding down "c" at boot will force the Mac to TRY and boot from the DVD drive first. Option (what you call "alt") on the other hand will simply show you a list of all bootable devices part of or attached to your computer, and you can choose which one you'd like to boot from (for that boot only).
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