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Why does adding files to disk sequentially fragment the disk


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#1 richierein

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Posted 14 June 2012 - 08:51 AM

I just completed adding several files to my newly defragmented disk, nothing else. But when I looked where things were placed, I saw that the disk was fragmented again. Why does this happen?

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#2 coxchris

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Posted 14 June 2012 - 09:34 AM

Fragmented files are split files across the NTFS file system

Depending on the size of the file its how big or what area they are in. For example hard drive are split up into 512bits sectors each
like if you have 1MB file to save it uses 2 banks of 512 bits sectors so you have

Home.txt
Home.Txt
Free
Documentation.doc
free
free

Now fragmented files are delete files that can be rewrited on the NTFS file system Now you deleteed home.txt You want to save a 4 MB files. what the system does is saves it over the home.txt because it marks as a free space

Database.xls
Database.xls
Database.xls
Documentation.doc
Database.xls

In this example you have a fragment file name Database. So the computer has to take time to seek it out or look for it amd find all the parts to the database and to open it

This is what we called a fragmentation file looks like

Now what de-fragmentation does it finds the missing parts of the file of database and try to make them into a continuous file and it move the documentation.doc to the other free space
so

Database.xls
Database.xls
Database.xls
Database.xls
Documentation.doc
free space
free space

http://en.wikipedia.org/wiki/File_system_fragmentation

Edited by coxchris, 14 June 2012 - 09:38 AM.

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