Defragment

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I Have MacBook Pro Retina for a year now a nd wonder if I should Defragment the drive, if I do whats the best software for it. I have Yosemite 10.10.1
 

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iDefrag is a recommended app for this. Defragmenting on OS X is usually not needed all that often...since OS X defrags on it's own. Only files smaller than (I think) 20 meg are not auto-defragmented.

Coriolis Systems :: Products :: iDefrag

And by the way (just in case). You're not supposed to defrag SSD or flash drives. Not good for them.

- Nick
 

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Just noticed that you have a retina MBP. You should not be defragmenting this computer. Due to its flash storage.

- Nick
 

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^^^^

defragging an SSD - bad juju...

One more maintenance item you don't have to worry about.
 
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Thanks for the tip. Its great to be here with lots of help
Again Thanks
Ron
 

chscag

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And for anyone else reading this thread.... If you're using Yosemite, iDefrag is not yet ready for Yosemite. The developers have been dragging their feet now for several months saying they will have a version out for Yosemite soon. In any event, like stated, do not defrag a SSD.
 
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And for anyone else reading this thread.... If you're using Yosemite, iDefrag is not yet ready for Yosemite. The developers have been dragging their feet now for several months saying they will have a version out for Yosemite soon. In any event, like stated, do not defrag a SSD.

Hi Guys - this has obviously come up on other threads since I've been a member here (have posted before on the topic) - SO, learned NOT to do any defrag on a SSD drive which is on my MBPro (early 2013).

However, wife is on an iMac (early 2013) w/ a 1 TB fusion drive, so 128 GB SSD component - the drive is only about 15% filled and likely will not get much above that level - my feeling is not to even worry about a defrag issue; BUT, let's say that drive in someone else's use nears its capacity, would one then consider defragmentation? Might just be a concern for others, I guess? Dave :)
 

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- my feeling is not to even worry about a defrag issue;

This would probably be my first thought. But I know not all folks feel this way. But I can see how the "hybrid drive" angle does complicate things some what. So maybe the "don't defrag an SSD" rule still applies.

BUT, let's say that drive in someone else's use nears its capacity, would one then consider defragmentation?

Depend's on what is meant by "near capacity". Let's say we're talking 5% or less free space. Remember our approx. 20% free space rule. If this computer only had 5% space left...they should already be off-loading stuff just to get to 20% free for better performance.

Getting back to 20% free space (by off-loading unneeded stuff) will probably do a lot more for this computer than defragmenting would at 5% free space.

- Nick
 

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Can't answer for a fusion drive - I'd be looking to look to the iDefrag folks and see what they say regarding that. Will never have a fusion drive in one of my computers.

I will guess that I'm likely one of the 2 biggest proponents of defragging in this forum.

For the casual OS X users, those who never fill their drive over 25-30% used, I wouldn't recommend a cash outlay for a defragger. Most of them are so casual in their use, they would never really experience (or recognize) the benefit vs the cash outlay and the time it takes for a defrag. The 2 second or even 10 second faster boot time typically means nothing. And maybe a 1 or 2 second faster app launch time means nothing to them. My wife's Macs have never been defragged and she's never commented about her system being slow that related to an issue that could only be solved by a defrag. She runs OnyX about once a year and that seems to keep her machine running the way she expects. If you ask her if her machine is still running as fast as the day she got it, the answer is yes - and I know better, because of the difference between mine and hers.

When working on friends machines that are complaining about it being slow, I refuse to run a defrag on a drive with less than ~20% free space. The free space issue has to be taken care of first.

A defrag will not cure the problem inherent with a mechanical drive that is using the last 20% of the drive space. This has nothing whatsoever to do with how much free space an operating system or app may require, and has everything to do with the nature of mechanical drives.

Running a defrag on a friend's machine with less than 20% free space because they're complaining their machine is slow - they're going to be calling you back in a week or a month saying it's slowed down again.
 

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I will guess that I'm likely one of the 2 biggest proponents of defragging in this forum.

Lol Tom...I know you are!;)

Defragging doesn't do any harm...so I personally have nothing against defragging.:) Of course like we both advised...no defragging on SSD or flash drives.

- Nick
 

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@sarah362:

We know you work for Stellar Phoenix. ;)
 
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@sarah362:

We know you work for Stellar Phoenix. ;)

Chscag - what happened to Sarah's post - I know that I read it earlier this morning!

Well, I'm still looking into Apple Fusion drive defragmentation - here is a short Discussion from iFrag - a brief concluding statement is quote below.

Also, here is their TAKE on SSD defragmentation - Dave :)

We think, based on what we know so far, that it probably isn’t worthwhile defragmenting a Fusion Drive....
 
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pigoo3

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Chscag - what happened to Sarah's post - I know that I read it earlier this morning!

We said "Bye Bye" to that post!;)

- Nick
 

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I used to worry about defragging drives a bit. Before I knew better I'd defrag when the drive defrag hit 5 -10%. In recent years I've only found two instances where defragging a drive made any significant difference:

1. I was doing some video capture pushing around multi gigabyte video files and a few large audio files. Eventually the drive became fragmented enough to make a difference.
2. On one of the occasions when I set up Boot Camp the drive was fragmented enough that there was not enough contiguous space to create the Windows partition. In that case I updated the clone I had, erased the drive and cloned back to the internal drive.
 
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We said "Bye Bye" to that post!;)

- Nick

Well, that's what I thought - after finding the information about iFrag not recommending using defragmentation on an Apple fusion drive, I wondered what kind of drive was in her Mac Mini? Dave :)
 
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FWIW: I don't think I've "defragged" a drive since the 90s.

The reason is two-fold:

1. I figured out that Macs like lots of hard drive free space because -- wait for it -- they do their own defragging.

2. On the very rare (every few years) occasion where I really feel like it might actually do some good, I do the poor man's defrag:

Clone
Test Clone
Boot from Clone
Erase original (one-pass zeros)
Clone back

Not complicated. Doesn't cost any money for a program you'll hardly ever use.

In short, I'm about as likely to pay for a defragger as I am an anti-virus.
 

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The poor man's defrag listed above by chas_m will work well for the vast majority of users.

However, just saying that Macs defrag on their own without further info is really disingenuous.

Yes, OS X defrags files and frankly does an exceptional job at keeping most of your individual files in contiguous space.

However, OS X does that by using the full space of the drive and looks for the next free contiguous space pretty much everytime it goes to write new data to the drive. Over time, this means that your data gets spread out on the platters and not only uses the slowest part of a mechanical drive, but because your data is physically further apart on the drive, it eventually begins to take longer to retrieve your data. This becomes particularly telling for those using 60-70-80-90% of the space on their drives and have a habit of continually moving data on and off their drives.

My question is, if you figured out Macs like
lots of hard drive space free
, why do you tell people they can run a 1 or 2 TB drive with 12 GB of free space. That's a joke right? Show me an in use 1-2 year old computer with a 1 TB system drive and 12 GB of free space and I'll show you a computer that runs like a 2 legged dog compared to my 6-8 year old systems.

I did notice you finally quit using that 12 GB free space is enough about a year or so ago when talking about this matter. But, you still refuse to define what amount of free space is recommended to keep a computer running relatively free of slow downs other than to say "lots". What exactly is "lots" in reference to the amount of free space you recommend?
 
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