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Not a lot of use on any ISAM drive of defragmenting unless it is80% full, in which case you have other problems than defrag. Imho defrag is just one of these ideas suppliers like to sell you - 'make your pc go faster' sort of deal
Basm Allah Alrahman Alrahim
I think defragment more than once a month is danger ! why ?
look to this link or see the next figure
what is happen in that figure first you will see files at any partition before defragment (i.e fragmented ) , the files may be separated at many parts at the hard disk or sectors , then when you make defragment the files parts or sectors will be putting behind each other in a way look like cut and past ( and it will use the end of hard disk like store for replacing sectors) , the problem may appear here ! ?
if you are making that daily and at the same time you are a fan of downloading file especially big files and move them to other partition or you are fan of installing and uninstall new programs that mean your hard will make changes to the sectors places within a very short time and that destroy the hard very fast (look like you are setup windows ever few days ) , and don't forget that the Operating system either make changes and replaces to files all the time at your hard disk
Note
1 - you don't need defragment in Linux OS
2 - you don't need defragment in SSD hards
