iMac EFI and Security Update

I found two new updates today. Here is the information about those updates:

27-inch iMac EFI Fireware Update

The update is recommended for all quad-core Intel Core i5 and Core i7 processors 27-inch iMacs.

This update addresses the following:

• Resolves an issue that sometimes caused high processor utilization while playing audio through the headphone output mini-jack.
• Resolves an issue that prevented the display backlight from turning on after powering on the iMac.

When your computer restarts a gray screen will appear with a status bar to indicate the progress of the update. Do not disturb or shut off the power on your iMac during this update.

Security Update 2010-003

Security Update 2010-003 is recommended for all users and improves the security of Mac OS X.

For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222.

Command: df -lak	Used(Kilobytes in 1024-blocks)
Before	...632,488
After	...198,880
Difference (A-B)	-433,608