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Best Disk Defragmentation Software for Windows 7?

Hello,

I intend to defrag my external HDDs and looking for a reliable software to perform the task.

I've used Defragler and Diskeeper before and would love to get your opinions on one such program.

Also, could someone please advise on how much free space (%) that I should have on my drives for an efficient defrag.

Thanks in advance
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Thanks thinkpad.. Good point. I leave about 20% of space before defragging.

Currently, I'm looking into Auslogics Disk Defrag since they claim it to be fast.. I've used Perfect Disk sometime back and based on your comments, may be I should give them another shot.
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Do make sure ur not using SSD and defrag is not supported on them
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Thanks everyone for your time and comments. :)

thinkpad: Will try PD 12.5

supports: Yeah, I only have HDDs. :(

web_tracker: Yeah, Defragler looked ok to me.

nobus: My external HDDs are subjected to pretty high copy, move and delete operations. So yeah, I guess I need defragging..

noxcho: Another vote for Diskeeper. Thanks.

Mani: Thanks for the versions..
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Quick q: I have a 2 TB external HDD that had write/read/delete operations almost daily for the past 2 years. Now it has about 40% fragmentation. I've left more than 20% of free space for defragging. Will it ever be defragged fully or to a reasonable level?
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Thanks again, Thinkpad.. After 7 hours, this is what Auslogics showed:

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Should I create about 200 - 300 GB more space and try defragging again?

Please advise. Thanks.
i would just leave it running
defragging a 2 TB drive definitly will take a long time  -no shortcuts available
I agtee it will take a very long time, so just allow it to run.

... Thinkpads_User
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Thanks nobus and thinkpads.

I posted the above results after the 7 hour defrag was completed. I'm wondering if I should try Diskeeper or PerfectDisk or just move the entire drive to another one and do a full format..

Please advise when you get a chance. Thanks again.
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Thanks again Thinkpad and nobus.

I've started moving data from the fragmented drive to another one. Once I'm done, here's hoping that a full format should clear all those fragments. I don't see why not.

I also intend to install Perfect Disk 12.5 before I start copying data back to the drive.

Am I in the right path?

Thanks again everyone for your time and comments. I'll grade this question now and post a comment once I'm done doing the above.
I'd like to put in another vote for Diskeeper - for several reasons:

1. Condusiv Technologies, makers of Diskeeper, has been the leader in this area for over 30 years and works directly with Microsoft. It's the only one I trust - who would know the Windows operating system better?

2. Diskeeper handles SSDs as well! This is because it's not doing a traditional defrag - but only optimizing the drive using advanced proprietary TRIM functions.

3. Diskeeper doesn’t need to be manually fiddled with or set to run on a schedule - it’s completely automatic.

I could go on, but wanted to make sure I addressed at least the points that address your concerns. If you need more information, please let me know.
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Thanks for your response, PhD.

I take it that you'd recommend Diskeeper over Perfect Disk, right?

My apologies for asking the obvious, but I felt it would be great if you had any experience with Perfect Disk.. Thanks again.
@slv5 - Thank you, and I was pleased to assist you with this. Good luck going forward.

.... Thinkpads_User
Yes, absolutely. Another expert posted just as I had said - that the makers of Diskeeper are the pioneers of the built-in utility. So I would think they would know how to handle this issue better than anyone else - having created software that directly interacts with, and is actually a component of Windows. I've had long conversations with their support staff - they really understand how the Windows OS works, how it handles files and how to address issues caused by this. I've tried the Raxco software - it’s just not the same thing.

Just my two cents!