![]() ![]() If you must pull the plug, as above run Disk Utility on its volumes to make sure the file systems are uncorrupted. This can leave the drive's data structures in an uncertain state because there is no time to write or update items in its buffers to the drive's permanent storage. If you feel that you must do something periodically to keep your Mac happy, run Disk Utility's Verify Disk step from time to time, especially after power failures, to make sure no corruption has crept into the file system. Unless you know how it does this, you are more likely to cause problems than prevent them by "helping" it. OS X is not like Windows, nor is it like OS 9 or earlier Mac OS versions. It also erases log files that may provide important clues about mis-operation of the OS or applications, & other useful info. It can even adversely affect the automatic feature built into OS X (called hot file clustering) that moves frequently used files to the fastest part of the drive. Among other things, this erases caches that speed up everything from starting the Mac to increasing the responsiveness of applications. ![]() As Allan said, there is no good reason to erase the drive & reinstall OS X periodically. ![]()
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