How to Erase Memory on MacBooks

Attach the drive your wish to erase and format to your machine if it is not connected already.
Launch a Finder window, click 'Applications', then 'Utilities'. Double-click the 'Disk Utility' application shortcut.
Click a disk in the Volumes section. Select the Volume type from the 'Volume Format' drop-down box.
Click the 'Security Options' button, then click to select the 'Zero All Data' check box. Click 'OK' then click the 'Erase...' button.
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How to Display Notepad on Yahoo on the iPhone

Tap the Safari icon on the iPhone's home screen.
Tap the URL bar. Tap the circle with the 'X' at the end of the URL bar to erase the text.
Type 'notepad.yahoo.com.' Tap 'Go.'
Sign in to your Yahoo! account if you aren't already logged in. Your Yahoo! Notepad appears.
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