Slack Space



Slack space is a form of internal fragmentation, which is wasted space on your hard disk. When a file is written to disk it is stored in the "beginning" of the cluster. A cluster is defined as a set of logically contiguous sectors and the smallest amount of disk space that can be allocated to store the file.
Rarely equal or match between the available space in the cluster and the number of bytes in the file. The remaining bytes in the cluster is not used, then the name of the slack space.
Slack space usually occurs in the file system that uses a large cluster size, while the file system that uses a small cluster size can organize the storage media more effectively and efficiently. Amount of wasted disk space can be approximated by multiplying the number of files to half the size of a cluster. Example, a 5000 personal computer that stores files in a file system that uses a cluster size of 4 kilobytes will have approximately 5000 x 2 MB ~ = 10000 KB. On a large file server, slack space and even reached the size of tens of gigabytes.

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