Defragmentation is the process that reduces the amount of fragmentation on a hard disk drive.

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Why is disk fragmentation measured as a percentage?

In Windows if I open up the Disk Defragmenter and analyse a disk the tool reports the disk fragmentation as a percentage: What does this percentage mean? Obviously if a drive is 0% fragmented then ...
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Scan Disk then Defrag, or Defrag then Scan Disk (in Windows)?

Which one should I do first in Windows 7? Scan Disk or Defragmenter?
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Unknown volume listed under Windows defragmenter

Does anyone know what "\?\Volume...." is or why it would be listed as a disk on the windows defragmenter? It is not listed on other defragmenters like defraggler. The E: and F: drives are ...
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Windows 8 Defragmenter?

It seems like Windows 8's defrag command has some new options, including: /K Perform slab consolidation on the specified volumes. Does anyone know what this means in English?
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Why does Windows Defragmenter do nearly nothing on a disk with 23% empty space?

While trying to defragment a 80 GB NTFS (4 KB cluster size) volume on Windows XP, I encountered a strange problem: the defragmentation process is very quick, but also very useless. Graphically, I ...
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568 views

What should I do with a badly fragmented disk? Defrag or copy to another drive?

I've inherited a machine with a large, badly fragmented disk drive containing lots of files. Defragging is very slow, and makes the drive seek a zillion times (you'd think enough to cause a ...
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Defrag and symbolic links in Windows 7

I recently purchased an SSD, and for a few reasons not worth going into I had to install Windows on a traditional HDD and make symbolic links so "Program Files" actually goes to my SSD. I started ...
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Is it bad to defragment a USB Flash Drive?

If I defragment my 8 GB Kingston flash drive, will it decrease its lifetime?
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Disk Defrag slowing computer down?

I asked How to speed up my computer? in another post and one answer was to run disk defrag. I have done this before and in the majority of cases (with multiple computers not just one) it seems to ...
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When is the data in the journal written to the disk?

(1) mentions that "With a journal the file is first written to the journal, punch-in, and then the journal writes the file to disk when ready. Once it has successfully written to the disk, it is ...
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How to find out how often my Windows partition has been defragmented?

I know that Windows uses its defrag program to defragment my partition sometimes when my system goes to an idle state. Also, sometimes I used to execute defrag by myself in order to increase ...
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What Windows app can I use to defragment a FAT32 drive's directories at boot time?

What (Windows app) can I use to defragment FAT32 directories? I used to be a fan of PerfectDisk, but they've disabled the feature in their latest versions, and I have drives that I need to use both ...
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Cleaning and housekeeping Linux computer hard disk

I started using Linux recently. On windows (which I've used all my life) to keep the HD tidy there are several tools, e.g. disk cleanup and defragger. On Linux what should I do to tidy up a hard disk. ...
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Gracefully kill defrag.exe when run in command prompt

When I run defrag in command prompt is there any way to gracefully stop the process before it finishes? Does killing the task in TM cause any problems if it is in the middle of moving a file? ...
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How do you defragment the MFT on an NTFS disk?

A while ago, I nearly filled my hard drive, much more than the recommended maximum of 85% of capacity. I believe that NTFS started storing files in the space reserved for the Master File Table (MFT) ...
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what's the rate of return of defragmenting our hard disk?

I know some people who swore by Disk Defragmenting. But basically I was wondering if the result (a more responsive computer) is worth the effort (running defragmenter - in a 2GB ram environment that ...
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Why did defragmenting C drive increase my free disk space by 10 GB?

I used Defraggler to defragment free space on my 100 GB C:\ drive which was 85 GB full. After defragmentation, the drive showed only 75 GB full. How did 10 GB  of free space ...
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Reserving space for files or set where on the HDD a file should be placed

To reduce fragmentation, I'd like to either reserve space for files or manually state where files should be stored on the HDD so the files can grow without fragmentation. This is useful for my mail ...
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Disk fragmentation on Linux

Do I have to de-fragment my ext3 and FAT32 filesystems on Linux? And if yes how?
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Why do disks fragment?

As a part of regular Windows maintenance, I defragment my hard drive. But why does the hard drive fragment on NTFS and FAT* systems? Apparantly ext* does not, why is this? Should I also be ...
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Is there any way to defrag a bootable XP hdd so all the free space is at the end of the drive?

I have an old PC booting Windows XP from a 40Gb drive. It also has a 320Gb hdd and a CD r/w. The 40Gb drive is getting quite noisy, and I'd like to swap it for a quieter 12Gb drive I have lying ...
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Does anyone know if it's 'normal' that you can't defrag an Outlook .ost file?

I've tried defragmenting my hard disk to see if Outlook performance improves. The .ost file shows 1000+ fragments but even after a post-defragmentation restart - never launching Outlook - it still ...
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Defrag C: /b really works to Windows boot optimization?

The command Defrag %SystemDrive% /b really works to optimize Windows boot time? (The defrag /b option is not documented by Microsoft). I am trying to use it in an attempt to optimize the files on the ...
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Requirements when defragmenting an external hard drive

I want to defragment my external hard drive which is 500 GB in size. It's divided into two partitions of 232 GB each. One has 70.5 GB free, and the other has 42.5 GB free. Can I defragment it now or ...
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What block allocation algorithm does NTFS use?

On Windows XP 64, I downloaded a 1.2 GB file and it ended as fragmented as the image shows. Unfortunately, before taking the snapshot from Piriform Defraggler I defragmented the other files, so you ...
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Is it safe to edit files during the defragmentation process?

Assuming I'm on an NTFS partition, is it just as safe to edit files during defragmentation as when not? Is there any added risk, even if very small? If not, how does the operating system ensure the ...
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Should I defrag my drive before upgrading to windows 7 from xp?

If I am upgrading from XP to Windows 7 by doing a custom clean install, should I defrag my computer before I start the process? Or does it not even matter since everything will be wiped?
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Something chewing on my HD in Windows 7

I just experienced something strange in Windows 7. I could hear how the harddrive was used at regular intervals of about one second. The same thing seemed to steal my CPU timeslice (from my own ...
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Win 7 defragmenter doesn't show all partitions

I just discovered yesterday that my D: partition isn't showing up in the Windows 7 defragmenter. All my other partitions (C, E, F) are there. The D: partition is running and working just fine - heck ...
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Defragment before Windows reinstall?

I'm going to reinstall Windows XP on a used machine soon. The data on the hard drive is heavily fragmented at the moment. I'm going to format the drive when reinstalling Windows so is there any sense ...
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My partitions won't defrag

I can't defrag my partitions, I tried with windows software, with Smart Defrag, Defraggler and others They all do the defragmentation process, but when I analyze again, I have the same fragmentation ...
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Defragging ntfs external hard disk from ubuntu

I'd like to defrag an external hard disk; it's formatted as NTFS for compatibility with windows when friends need files off of it. However, I use only ubuntu. I've tried running defraggler under ...
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Is it possible to defrag the hard disk without admin rights?

Is it possible to defrag the hard disk without admin rights? I'm using Windows XP.
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PerfectDisk 11 (Defragmenter): Difference between layout.ini management options

I would like to ask what is the difference in Windows 7 between these two settings in managing layout.ini and files needed to start the computer in PerfectDisk 11 Professional: (1) 'Let PerfectDisk ...
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what damage can be caused if scandisk is not run before defrag

I would like to know what the damage to a drive can be if a scandisk is not performed before a disk defrag. I have looked up some sites that say a scandisk should be run to correct any issues that ...
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Unable to use BootCamp to Install Windows 7 on my Macbook Pro

I get the error: cannot complete the partitioning because some files cannot be moved. I have more than enough space (250GB harddrive, 150GB free) I have tried doing a full defrag with iDefrag I ...
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Has Microsoft improved Scandisk, CHKDSK and Defrag in Windows 7?

Is there only interface design change or something internally has changed? Most of the time I could see that Scandisk is unable to check OS partition as there are no rights. It schedules the task to ...
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Defragmentation and disk based backup

I usually do backups using backup solutions like Norton Ghost. Is it advisable to do defragmentation of the drive before taking a drive image? Will that offer any advantages when I restore from the ...
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Do I need to run defrag on an SSD? [duplicate]

Possible Duplicate: Do SSDs suffer from fragmentation? Is there an advantage to it? I mean, SSD is essentially random access memory.
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Auto defragmentation of SSD

I added a SSD to a 2003 server. I heard there is some kind of auto defrag in windows which is disabled for SSDs from windows 7 only. Is there a way to disable the auto defrag in Windows 2003 Server? ...
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Do I need to manually defrag a Windows 7 PC?

Given that Windows 7 will auto defrag a PC when it's idle, does that mean manually defragging a PC is a thing of the past?
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Automating Defrag

I want to defrag my work PC daily and would like to do this while I'm not at work. I know how to schedule a task but this requires the Defrag UI. How can I automate Defrag to run without user ...
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What's the fastest application for defragmenting NTFS?

For daily/weekly use, so not copying whole disk/partition to disk/partition. What's the fastest way in Windows to defragment NTFS? Edited to add: This is on a 2 Tb hard drive, used for storage only, ...
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Is it Safe to Defragment your Computer when you have low disk space

Is it safe to de-fragment your disk when you have low disk space? What could be the consequences? What are the advantages and disadvantages of de-fragmenting. Is it possible to resume de-fragmentation ...
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Why is my hard drive still fragmented after I run defraggler?

I ran defraggler last night because and I let it run while I slept. I woke up this morning and it still told me my hard drive was 20% fragmented. So I ran it again before I left the house for a ...
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Is there any advantage to using the program “Advanced Defrag” over the defrag capability in XP?

I followed the "Related Questions" link but "Advanced Defrag" was not mentioned. If there are advantages, please list them.
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Does downloading/copying files simultaneously promote fragmentation?

Does writing more than one file simultaneously to a hard drive partition promote fragmentation? Would these files be written interlaced on the hard drive? Examples: Downloading several files ...
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Impact of fragmentation in Games

I'd like to ask, if you install about 15 GB (2 - 3 games) on a system partition (and your pagefile.sys is located on the other drive), could it cause the fragmentation to occur in that way, that the ...
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Mac filesystem and defragmentation

Since the Mac OS is running on something kind of like Linux does that mean that it also doesn't get fragmented?
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VMware says virtual disk is fragmented

In Linux I'm running Windows inside VMware Player. When I shut down Windows, VMware Player says the following: How can the disk be fragmented if the host system is Linux? If I defragment the drive ...