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Check the CPU usage as I suggested earlier.In this video tutorial I will show you the best free disk defragmentation program. That said unless this video has a very high datarate I'd be a little skeptical about that being the cause. When you defragment all those pieces are moved so they con be read in one continuous stream. If the file is fragmented it *may* cause a lag at the same part of the timeline in a video. While this will lower performance it's not going to very noticeable accept things like video which need to be real time. Instead of being able to read the file in one continuous stream of data like you would have when listening to a record the arm has to move around to get the new chunks of data in the different locations. If a new file doesn't fit into that space fragments can be written into many of these open spaces on the drive. When you delete a file that space is made available for other files. A hard drive is very much like a record player, it spins and just like a record player it has an arm with heads to read the data. This is typically not an issue on a external drive because you don't delete and add files frequently. Under the right circumstances, and with the right recovery software, you could still recover the file. When you defrag, its very likely that you are going to cause data to be written in one form or another to the space the file exists in - but its not a sure thing. In a nutshell, it hides it from view, and lets the operating system know that if it needs to - it can overwrite the space that the file exists in. However, it is possible to stand those markers back up again and retrieve the files In effect, the markers that define the location of the files are knocked down so they cannot be seen. It only removes it from the directory so it can be written over. It's job is not to free up space, but to optimize the layout of existing files on the disk. In no case should a live file be deleted by a defrag program. OS/2's HPFS was very resistant to fragmentation both FAT and NTFS not so much. Can someone explain what it is and why it's necessary to do it in order for those few videos to stop lagging? And what does this mean
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