Trivia

Hard

In Computers, “Slack Space” Is A By-Product Of What?

Hard Drive Degredation
Poor Memory Allocation
Cluster Sizing
Underusing Optical Media
An open hard drive showing the physical platters and actuator arm.
Christian Jansky/Wikimedia

Answer: Cluster Sizing

In order to decrease the overhead of data management, many file systems use a cluster-based approach wherein data is grouped together in chunks anywhere from 512 bytes to 64 kilobytes or more.

In file systems where the average file size is very small (say a computer system storing hundreds of thousands of 4 kilobyte files) and the cluster size has been set very large (say 64 kilobytes), a large amount of space will be wasted as the smallest amount of space that can be allocated (64 kilobytes) is radically larger than the size of the majority of files on the system (4 kilobytes). The space wasted in each cluster by the difference between the file size and cluster size is known as slack space.

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