![]() ![]() While I am not certain all this is absolutely necessary before performing the upgrade it cannot hurt and it may well prevent potential installation glitches and it may result in better system performance overall. ![]() download and run the OS X 10.8.1 (Mountain Lion) installer from the App Store.use Drive Genius or TechTool Pro to defragment the disk.use Drive Genius or TechTool Pro to defragment the files.run a complete suite of tests and repairs on the drive using DiskWarrior, Drive Genius, or TechTool Pro to be certain the volume structure is in pristine condition.The goal of all this being to free up as much disk space as possible. use CleanApp or a similar utility to perform a thorough housecleaning of your hard drive, deleting any unused applications, duplicated data files, unused preference and support files, and any other junk files you no longer need.be sure I had a current backup or clone of your HD.Given the high level of file fragmentation and relatively small free space on your HD if I were in your shoes I would However, I have a large hard drive and it is less than 60% occupied so there is plenty of free space. That said, I still defragment my files and the disk once or twice a year more out of old habits than any real or perceived necessity and I have never bothered to defragment before or after an OS upgrade or update and I have never had any problems. Disk and/or file fragmentation is not the threat it used to be and whether or not it is necessary has become arguable. ![]()
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