BACKGROUND
The fundamental question is: “Should I update/upgrade my operating system?” A proper answer requires a bit of thought:
Pros- Security patches make your computer more secure
- Bug fixes make your computer more stable
- Feature enhancements provide additional functions
Cons- May require more RAM
- May require more disk space
- May decrease performance
- May induce catastrophic data loss due to improper installation procedures
Unless there is an overwhelming Con, the Pro’s always trump. However, it is this last “gotcha” I will be addressing in this blog.
POWER PROTECTIONThe single greatest source of computer hardware, software, network, and directory problems comes from unclean AC power (power surges and sags). The only way to resolve this is to connect a quality battery backup (commonly called a UPS) between your computer and the AC outlet.
Why a UPS and not a surge protector? After all, a UPS will cost from $100-$700 or more, and a surge protector can be purchased for under $50. Here are the dominant reasons:
- Surge protectors only protect against surges, UPS protects against surges and sags. Both are dangerous to your computer equipment.
- Most surge protectors don’t even protect against surges once the protector is 6-12 months old.
- Even when new, many surge protectors can’t respond fast enough to block a typical surge.
- Even the best surge protectors do not protect against surges and sags induced by the other equipment connected to it.
Most UPS systems have multiple outlets to connect your electronics. These are typically divided into “battery backup” and “surge only” outlets. You must connect your computer, external storage devices, card readers, and monitor to the battery backup outlets. Scanners, lights, and other miscellaneous equipment may be placed on the surge only outlets. Never use a surge protector or power tap on any UPS outlet. It not only voids your UPS warranty, but functionally removes the protection offered by the UPS.
Your UPS will need adequate volt-amperage to support all your battery backup devices. As a general rule, 750 va is the minimum recommended for a laptop. At 1500 va, you have enough power to support an Intel Mac, server or graphics workstation with all the bells and whistles attached. Make sure your computer is connected to a UPS from the first time you power up.
There are several vendors, each with multiple quality and price lines. My recommendation is for American Power Conversion (APC), Belkin, and Tripplite brands as an excellent balance between quality, performance, and price.
AMBIENT TEMPERATUREBottom line: If you are feeling uncomfortably warm in your work environment, it’s too warm for your computer. The result of running your computer in a too-warm environment includes: System crashes, corrupted files, damaged hardware.
Removing the cover from the computer case does not lower the “internal” temperature. It will do the opposite, leaving your computer running hotter.
Things you can do to help your Mac keep it’s cool:
- Keep your computer from direct sunlight.
- Allow some breathing space around your Mac. For most models, this means at least 3” around all sides, and don’t place any significant heat barrier (like a book or stack of papers) on top of your Mac.
- If the equipment is in an enclosed cabinet, install an exhaust fan to blow the warm air out of the enclosure area.
- If the above doesn’t do the trick, it will be necessary to either move the equipment to a cooler environment, or to install an air conditioner (it’s ok, you were sweating too much anyway).
PREPARATION
Now that you have taken care of the environment, time to prepare the system for installation or updating.
- Run directory and system diagnostics and repair. This can be done by using Mac HelpMate and either AppleJack or running fsck in single user mode (see my blog “Mac HelpMate and AppleJack Step-By-Step&rdquo

- Create a clone backup of your boot drive. This is essential in the event of problems after the update, you are able to restore your boot drive to it’s original state. For more information about how to create a clone backup, see my blog “Carbon Copy Cloner Step-By-Step”
- For system updates, download a Combo Update not a Delta Update. Delta updates are what typically appears in the Software Update window. Combo updates must be manually found on Apple’s site. For 10.5.8, the combo update is available here. For 10.6.4, here. For others, visit the Apple Support page, and in the search field enter the desired system version number followed by “combo”.
- Before installing the update, shut down your computer, disconnect all peripherals except monitor, keyboard, and mouse, start up, make sure no other applications are running, including anti-virus software.
INSTALLATION
- Run the combo updater.
- When the update completes, allow it to reboot the computer on its own. This can often take 30 minutes or more while the system may appear stalled.
- After the system reboots and you are returned to the desktop, repeat step 1 for both Mac HelpMate and either fsck or AppleJack.
- Launch and run your applications to verify functionality.
Tags: mac OS X, update, upgrade