Why is defragmentation unneeded?
Some say that it's in fact a misconception that we do not require defragmentation. It's said that we carry out in reality require it, yet just as soon as the filesystem obtains rather complete (i.e. much less than ~ 10% vacuum). Devices are readily available for defragging such as e2defrag.
Fragmentation is the item of creating documents in the first readily available open blocks on a drive. With time, as documents get developed and also removed, tiny areas of disk open, which creates freshly created documents to be divided over numerous such openings. This can lower performance, although it was far more of a trouble in the past with slow-moving equipment and also slow-moving disks.
The default filesystem in Ubuntu, ext4 (and also till lately, ext3) are made to restrict fragmentation of documents regarding feasible. When creating documents, it attempts to maintain the blocks made use of consecutive or close with each other. This provides defragmentation properly unneeded.