Once you’ve entered your Apple ID, your computer will begin downloading Yosemite. Type your Apple ID and Password to sign in. Locate and select OS X Yosemite, then click Free Upgrade. Defragging a hard drive populates the related files together as much as possible and speeds up the system performance. To download and install OS X Yosemite: Click the App Store icon on the Dock. Defragmentation is the method to lower the fragments and make the unused space available as contiguous storage. ![]() It may also lead to system crash or boot time problems. They remain useless in the form of isolated memory space. Now, if a file requires 23 bytes of storage, it has to be allocated 32 bytes. The memory chunks can be provided in the multiples of 4, 8 and 16. The most difficult to remove fragmentation type is internal fragmentation which occurs due to the rules according to which the space on the storage is allocated to the data. ![]() The files are written to the storage in chunks of memory and upon repeated write and read operations they leave memory chunks that cannot be used as contiguous storage locations. Fragmentation is a common phenomenon that occurs on the hard drives over the course of time and its usage.
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