If you run one of many popular hard drive diagnostics tests, such as SilverLining, FWB Hard Disk Toolkit, or MacTest Pro, you may have noticed that often times these tests report that the hard drive test has seemingly "failed" on a Power Macintosh 7200, 7500, 8500 or 9500 series computer after they have been testing the computer for 30 minutes or more.

One very likely "cause" of this "failure" is that the Energy Saver software is making the drive spin down during the testing, which causes the diagnostics report that the hard drive has failed its tests.

To avoid this, in the Energy Saver control panel, set the Sleep Setup option to "Never" before you begin the testing procedure. This will prevent the Energy Saver software from spinning down the drive and allow the hardware testing utility software to properly check the functionality of the hard drive.

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