Defragmentation

Lots of stuff in another thread about file systems.
I mentioned defragmentation. There seems to be a lack of understanding about
what it is. Has zilch to do with the TOC.
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In the maintenance of file systems, defragmentation is a process that reduces
the amount of fragmentation. It does this by physically organizing the contents
of the mass storage device used to store files into the smallest number of
contiguous regions (fragments). It also attempts to create larger regions of
free space using compaction to impede the return of fragmentation. Some
defragmentation utilities try to keep smaller files within a single directory
together, as they are often accessed in sequence.
Defragmentation is advantageous and relevant to file systems on
electromechanical disk drives. The movement of the hard drive's read/write heads
over different areas of the disk when accessing fragmented files is slower,
compared to accessing the entire contents of a non-fragmented file sequentially
without moving the read/write heads to seek other fragments.
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formatting link

Way back in the stone-age things like this were important when you were
concerned about seek time and how it impacted performance.
Reply to
Sidney_Kotic
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And is one of the reasons that Linux uses by and large file systems designed with all this in mind that don't actually fragment files. And massive file caching too, so that memory that isn't needed for anything else is acting as a fast random access copy of bits of the disk that you have used recently.
Of course these days with SSDS who gives a ****. The relationship between a requested track/sector isn't anything like constant as wear levelling algorithms rearrange the SSD on a routine basis anyway.
And there is no seek time.
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Reply to
The Natural Philosopher
I love the "blah blah blah" in reference #4 in the Wiki cited. Very academic.
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Graham. 
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Graham.

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