Defragmentation for Mac
Defragmentation is a process by which files that are not stored contiguously are moved into contiguous positions on a hard drive. Macs need defragmentation much less than PCs.
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Defragmentation of Files vs. Defragmentation of Hard Drives
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File fragmentation occurs when segments of individual computer files are not contiguous on a computer's hard drive. Hard-drive fragmentation occurs when the available space on the hard drive is fragmented, even though individual files might all be continuous. Fragmentation slows computer speed, because the computer has to look for all the segments of a file to be able to work with it.
File Defragmentation on a Mac
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Unlike PCs, which require defragmenting every few months, Macs running OS 10.3 Panther, 10.4 Tiger and 10.5 Leopard rarely need to defragment or optimize files. These operating systems have automatic maintenance features that defragmentize and optimize files without the you having to do anything.
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Hard Drive Defragmentation on a Mac
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Hard-drive fragmentation only becomes a problem when there is little available free space left on the computer hard drive. When this occurs, the operating system has little working space left to use for temporary files or virtual memory. Macs rarely have hard-drive fragmentation problems until their hard drives are 80 percent full, though some users report problems with 60 percent full hard drives. Recommended by App Storm and Mac Attorney, iDefrag is an application with customized options for defragmenting a Mac hard drive.
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References
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