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iPartition makes it easy to create, destroy, resize or format partitions on your hard disks, whether internal, external, fixed or removable.

With iPartition, resizing a partition is as simple as selecting it, grabbing the resize handle and dragging. Not only that, but if you have several operations to perform, iPartition lets you queue them up and run them one after another, so you can have a cup of coffee whilst iPartition works. This feature, coupled with iPartition's ability to automatically rearrange your existing partitions when asked to expand a partition, makes iPartition the easiest disk partitioning more...

What's New

Version 3.4.3:
  • Fixed a crash or hang that you could get in rare circumstances when iPartition was trying to compute which partitions need moving.
  • Fixed an issue where the visibility of the utility windows would not be saved correctly when iPartition terminated.
  • Fixed an issue where you might see an "Unable to change partition type" when you first run iPartition.
  • When more...


OS X 10.6 or later

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Ok, please understand something. I have been working on computers and therefore have been dealing both directly and indirectly with software manufacturers since about 1995. I have *NEVER* seen a software company so good at support. Here's what more...

5 people found this review helpful
Version 3.4.2
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JimM5651 Member IconReview+5

Ok, please understand something. I have been working on computers and therefore have been dealing both directly and indirectly with software manufacturers since about 1995. I have *NEVER* seen a software company so good at support. Here's what happened:
I work at a University and needed to use a software solution to partition Mac computer that are running Bootcamp / Windows 7. Saw and liked the look of iPartition and purchased it.
It worked flawlessly when making a Bootable CD/DVD but I could not get it to create a bootable Flash drive. I emailed support and they responded with a few questions about my set up. After we hacked out the particulars, they sent me a customized installer file for iPartition. I now had the ability to create a bootable Flash drive but it kept failing while it was creating it.
I explained my situation, sent them the error log and the next day they rewrote another installer file and now it works perfectly.
Others who are reading this and have been in the computer field for a while will be as shocked as I was at the support response of this company.
Just basing my opinions on this, I would look to this company's products first if I was looking to buy other software items. You just cannot find support AND a quality product like this for other software developers.
Buy their products and you will not be disappointed...

(not sure why the "Value" was listed at 4.5 stars, I tried many times to click on the full 5 stars but for some reason it would not allow me to go back and change it)

Reply0 replies
Version 3.4.2
Bowlerboy_jmb Member IconComment+211

Something is not quite up to date, or accurate, regarding the demo software.

The developer says that the software is Universal, but MacUpdate says Intel only. Since it supposedly runs on the PPC platform, I downloaded the zipped demo file from the developer's website, but the application resulting from their own zip file would not open: instead, it gave me an error message, saying that their application was "corrupt," due, allegedly to Stuffit Expander's faulty decompression scheme. The developer then bails out, saying "please use software that comes with your OS X."

Heck! Reason I wanted to try iPartition out in the first place is that Disk Utility is failing to format an external Fireware hard drive. The formatting gauge won't budge, after six hours of my attempt to erase a drive that was working fine yesterday, until I let Drive Genius have a go at it!

Good thing I didn't buy the iPartition software to find out that they distribute software in corrupted zip files. Someone ought to tell them about disk images, I guess.

Reply2 replies
Version 3.4.1
Chris From Coriolis

We don’t distribute corrupted Zip files. Unfortunately, there are buggy third party Zip utilities that don’t correctly handle file names with certain characters that we use for some of our non English files. With most applications, you won’t notice this corruption until you try and actually use the files in question, but we perform a check at start-up to make sure that it has been decompressed correctly and warn the user when it hasn’t been.

As for using disk images, we used to use disk images and probably know a good deal more about disk images than most people, but we chose to go for Zip files instead because they offered a slightly better user experience for most people—by default Safari will expand Zip files whereas it won’t with disk images any more.

Anyway, I don’t think asking someone to use the built-in software to decompress a Zip file is unreasonable.


I don't trust StuffIt Expander after experiences with it silently corrupting output. I now use The Unarchiver for extracting formats that Apple's Archive Utility doesn't support.

EricJanota Member IconReview+1

It crashed and killed my 8TB drive. I have an 8TB RAID5 that I was trying to repartition. The software ran for less than a second and now the existing partitions on the drive are gone.

I would not expect it to kill my drive. At the worst I thought it would just go slow. I never expected it to take my drive down when it crashed.

Reply1 reply
Version 3.4.1
Chris From Coriolis

I have just taken a look at the problem that Eric had and, rather than restate what I just emailed Eric, I am posting it verbatim here (with Eric’s permission):

Hi Eric,

My name is Chris and I’m a developer at Coriolis Systems who works on iPartition.

We occasionally have a look at MacUpdate to see what people have posted and I came across your posting. Obviously, bad reviews are not good for us. Anyway, I decided to take a look at your ticket and did some digging and I hope you don’t mind if I update you with my discoveries.

I have managed to reproduce the problem you were having, or what I strongly suspect happened in your case. The reason iPartition crashed was caused by there being a bad entry in your partition table. When iPartition encounters a bad entry, it does what you would expect and skips it. When that happens, it shifts the partitions in iPartition’s internal structures up one place to take the place of the bad entry. For example, if the table on disk looks like this:

1. GOOD - partition A
2. BAD
3. GOOD - partition B

Internally iPartition will have them as:

1. GOOD - partition A
2. GOOD - partition B

Now when iPartition comes to perform a move operation, it looks at the partition table on the disk and assumes that the table on disk matches the internal table. When it finds it doesn’t match it gives up and crashes as you experienced. It’s obviously a poor assumption to make.

If you had happened to perform any other operation before the move operation, iPartition would have been fine because it would have written a correct partition table. So, it’s a fairly rare set of circumstances that caused the problem you were having: you were using an Apple partition map (which is rare nowadays), you had a bad entry in the partition table (rarer still) and the first operation you were performing was a move operation (usually you would perform a shrink operation first). Of course, I understand that won’t make you feel any better, but maybe you can understand why it’s not something we’ve come across before.

It’s worth noting that had you chosen to add the repair operation and commit it as my colleague suggested, everything would have been restored and no data would have been lost.

Now I must admit it’s a little unfortunate that my colleague didn’t see what went wrong. He thought that the problem had been caused by a loss of power and that it had failed in the middle of the operation, which isn’t the case; there’s no doubt it is a bug in iPartition. Having said that, he gave you a refund and advised you to add and commit the repair operation so the end result should not have been that bad for you.

We’re obviously very sorry this has happened to you, but unfortunately, all software has bugs and I guess you were unlucky and caught one of ours. We actually have surprisingly little support e-mail given the nature of our software and how complicated it is. One positive thing to come from this is that the same problem shouldn’t happen to any more of our customers once we have released a fix.

You still have the license for iPartition, so I hope one day you will perhaps consider trying iPartition again (with better results).

I would like to post this e-mail verbatim as a response on the MacUpdate website. Please let me know that you’re comfortable with that.

Kind regards,


Reconfigger Member IconComment+0

I wish there was a straightforward way to send a comment to MU about this listing, but in the absence of my ability to find it, I would like to note here that version 3.2.0 was the last build to support Tiger (10.4.11). The version offered here (3.4.1, as of this writing) will only run on Leopard (10.5) or later. 3.4.1 does still work on PPC machines, fortunately.

Unfortunately, there does not appear to be a way to download the earlier version (aside from file-sharing options).

All of that aside, iPartition is a powerful and fantastic program.

Reply5 replies
Version 3.4.1

Thanks! We'll correct the listing.

You can always reach us at update AT macupdate DOT com.


Actually, according to the developer's Web site, it's now Intel-only and compatible with 10.6 or later. You were able to run it on 10.5?


Thanks for your prompt reply! I never would have thought to email you directly. Duh. Sorry!

It turns out I misspoke earlier. In my defense, Coriolis Systems has put out mixed messages w/r/t iPartition 3's system requirements (though I doubt on purpose).

According to the company's blog post for iPartition 3.2.0 (via Chris), Coriolis "dropped support for Panther (10.3) and PowerPC G3 machines" and do not recommend upgrading if you fall into either of those camps (view the original entry at http://www.coriolis-systems.com/blog/2009/11/ipartition-320-released/).

However, according to the news feed that is specific to iPartition 3 (at http://www.coriolis-systems.com/view-feed.php?feed=iPartition-3), the last version that would run in Tiger was 3.3.0. Per Chris again on the entry dated November 2, 2010, the updated sys reqs for version 3.3.1 are "OS X Leopard or higher; Intel machine or PowerPC G4 or higher." Neither the company blog nor the iPartition feed declare more recent changes to the sys reqs than those.

Despite the declaration on iPartition's main web page that the current version requires OS 10.6 and Intel processors, iterations subsequent to 3.3.0 (as of this writing, there have been four) still download and run fine as universal binaries. I wouldn't think they would leave the legacy code in 'by accident,' so perhaps sys reqs on the web site are a clerical error? It is puzzling.

I'm not complaining! I have a few legacy Macs still running and I am happy to be able to use the application!


Hmmm. That is a bit confusing. I guess that, for now, I'll leave our requirements set to 10.6, just to be on the safe side. Let me know if you find out anything else. Thanks again!

Chris From Coriolis

Officially we don’t support PPC or 10.5 any more. However, I believe version 3.4.2 will probably still work on 10.5 and PowerPC machines; we just don’t guarantee it or that the next version will.

Peterpan23 Member IconReview+52

"Thank you Coriolis Systems for bringing the best tools to the Mac" ...and making still perfect things even better!!!! I use iPartition and iDefrag for years without even one little tiny crash. Awesome developer. Normally I do test every new version from any other developer on a backup system before using on real drive. Not so with tools from these guys. You are my heroes

Reply0 replies
Version 3.3.2
iPoopStore Member IconReview+134

I do not know what kind of gibberish Smayer97 is spouting previous to my review but I really do not care and dismiss him as a crack pot. Any person naive enough to download Wondershare products deserves the spam he will be getting.

iPartition has never let me down yet. I would agree with Chrisiboy that iPartition has always been rock solid and did exactly as advertised.

I lost electrical power and iPartition was able to repair and continue with my partition moving without any lost data. I do know there is not one other tool that can pick up where it left off after a power failure as iPartition and iDefrag have done for myself in the past.

I will agree the price of iDefrag and iPartition are on the high side for casual users that don't require the tools regularly. I use them both often and they are worth every penny to me for the safety features and because compared to similar tools none equal the quality that has gone into these tools.

Thank you Coriolis Systems for bringing the best tools to the Mac.

Reply3 replies
Version 3.3.2

Is there a way with this tool to backup a bootcamp partition? Something like Winclone, possibly creating a backup file that is just as big as the actual size of the files that Windows was using, without being a 1:1 copy of the raw device?


@Werty, assuming you intended to post that question seperately and not as a reply; I can help.

I would recommend trying to use BOTH iPartition 3.4+ and Paragon Hard Disk Manager Pro v10.1.19+ BOOT Disk.

Paragon HD Manager Pro v10.1.19+ for successefully making a 'usable' backup of Bootcamp (something I was once able to acheive with Acronis but is not supported/functional with Lion/ML Bootcamp partition and the current bootstrap). Paragon will do this succesefully without the sector by sector large backup scenario.

iPartition 3.4+ for all your other needs such as the best resizing tool you can possibly get and determining which disk format structure you want to set.

Many Mac users very quickly realize that they underestimated the pre-determined size they allocated for Bootcamp and often want to increase the bootcamp partition size or decrease it if the OS X partition is getting full. iPartition is the only reliable tool for the job. In any partitioning resizing scenario it is imperative to do backups first before carrying out the procedure, therefore do a Time Machine or SuperDuper backup of OS X first and then the following recommended procedure for doing a Bootcamp backup before resizing the partition with iPartition:-

Firstly boot up in Bootcamp, then insert said Paragon HD Manager Pro Boot Disk into the Mac DVD Drive and then click on 'Restart' within Windows in Bootcamp. Upon restarting within Windows Bootcamp partion you will be asked if you want to boot from DVD by hitting any key to do so (before the countdown expires), pressing enter will do nicely. Then Paragon HD Manager Pro will load up in which you will want to choose the 'Smart Backup & Restore' Menu option (NOT the partition nor the disk copy) and then the Smart Backup option dialog box will appear. Then Choose partition option over files and folder option. You will be asked what to backup which will be C:BOOTCAMP of course. Then you will be asked for the target/destination. Once the procedure starts it will only actually copy all the data and no unused space i.e. no sector by sector copying, which would be far too large in size. ((An additional bonus is that you will be able to restore this kind of data-only-Bootcamp-backup to ANY Bootcamp sized partition afterwards in the event of any emergency scenario))

Next is the Legendary iPartition itself...

WARNING: do not be tempted to use the Paragon HD Manager Pro which you had just used for backing up BOOTCAMP, while it is great for backing up Bootcamp, it is however no good for resizing partitions as I once found out. It will indeed resize a partition, however I 'lost' the GUID format structure and status after using it which resulted in OS X not seeing the Macintosh Hard Drive within the Startup Disk Preferences for the System Settings and it did not appear after holding the option key when switching on the Mac to manually choose which disk to boot up in. OS X Disk Utility also confirmed that there was no longer the GUID structure status, it basically dissapeared after using Paragon HD Manager Pro (probably a bug). However, iPartition is solid, reliable and simple to use.

In iPartition itself its very straight forward and visually simple; once you've re-adjusted the partition sizes between OS X and Bootcamp itslef to a new desired size in the very eye-friendly UI, just hit the play/proceed button and the rest is straight forward as you wait. If your fortunate to have an SSD, then it will be very quick indeed although note that the progress bar may not move at all until the point it's finished; therefore do no abort thinking it gets stuck as I nearly did, instead I waited thank god - bear in mind a normal HD will indeed take a long time.

Once iPartition is finished then thats it! Reboot into desired OS (Note that Windows in Bootcamp may automatically do a CHKDSK procedure - this is fine)

Final Note (and seperate to iPartition): If you ever have to restore a 'Bootcamp' backup in an emergency, then bare in mind Lion's/Mountain Lion's different boot-strap procedure can be a problem therefore you may have difficulties in directly booting up in the Paragon Boot disk in order to restore the Bootcamp Backup you made. In this case just run Apple's Bootcamp utility within OS X and reinstall Windows from a Windows installation DVD paying attention to the partition size you want (however as you know you can always resize it later with complete confidence with iPartition). Then boot up in Windows bootcamp, insert Paragon HD Manager Pro boot disk and restart remembering to press a key when windows starts for the Paragon boot disk to load. The just go through the Restore procedure.

Hope that all helps.



I'm experiencing the issue you describe where the re-partitioning progress (or lack of) prompted me to hit abort – and then I saw your reply!
Any ideas what to do in that situation? I'm currently still on the 'waiting for current operation to complete' message (0%), which is either the disk being unmounted, the partition being moved (from 250GB to 330GB) or what else I'm not sure. Any ideas would be gratefully received, as I'm concerned I've buggered my disk!

Smayer97 Member IconReview+37

TERRIBLE! Very limited!!!

1. does not allow chaning partitions on boot drive
2. does not work with SoftRAID
3. Does not work with AppleRAID (per their documentation), which is odd because AppleRAID is listed in the format types. I don't get that!
4. does not recognize RAID volume names, so cannot be sure which partition is which, when partitions are similar size
5. Loads both main drive AND volumes separately in list clicking on volume states it cannot find a Partition Map for the volume, but allows manipulating the volume without having to go to map of original drive map...DANGEROUS!

Reply4 replies
Version 3.3.1

The only thing I find DANGEROUS is people like you living amongst the rest of society. I pity your family and friends. They must run for cover when you start to speak. I've been using iPartition for over 3 years and can attest your review is based solely on lies, ignorance and fear mongering. In fact I am so sure you are lying on every complaint that I'd even bet my bottom dollar you did not purchase this software and were using it illegally. In the past 3 years when I ran into trouble twice and emailed the authors of this tool I was emailed a reply in a timely fashion. I was either given the answers I hastily over-looked or I was asked to submit a detailed bug report and the problem was solved with a update.


@iPoopStore - Oh my word! You would think I was threatening the life of your only born child! Lighten up!

I guess I could have stated that...I do like its graphical presentation, and the level of detail in its identification and information of partitions.

And, I am glad you have had a good experience with this product and with their support. Fact is, it still has come serious shortcomings for a serious partitioning tool, especially where it presents partitions in a way that can be altered that should not be permissible, i.e. point 5.

And no, I have not purchased the product for the very reason of its shortcomings. I used the demo and read in detail its documentation. These are factual researched and educated statements, not "I am so sure..." like you say, without verification.

Coriolis Systems Limited (Developer)

To respond to these points:

1. Yes, it does. But you will need to boot from a different disk. This is a limitation imposed by Mac OS X itself, and one that we do try to help with (e.g. by letting you make a bootable disk from within the application).

2 and 3. It does work with software RAID, but in the way you’d expect. That is, because iPartition doesn’t understand the software RAID format, it isn’t able to alter it (this would be risky in any case because neither format is documented AFAIK). However, you *can* create partitions within a software RAID slice, and indeed this is sometimes a useful way to do things. Obviously, partitioning an unpartitioned RAID slice will destroy whatever data is there already.

4. See above; the format of software RAID volumes is generally undocumented and quite complicated. Yes, we could try to reverse engineer it (and in Apple’s case I think the code itself is public, though we can’t just incorporate that in our application for licensing reasons), but it would be risky.

5. This is happening because you are using software RAID. The underlying disk is still present in the system as a disk device (with a partition map, containing RAID related partitions), and the RAID driver has created a set of virtual disk devices that map to its RAID slices.

I should add that, if you were using hardware RAID instead, you wouldn’t see the underlying devices at all — only the RAID slices — and in that case they usually contain partition maps (unlike software RAID slices, which usually do not).

I don’t really think, on the basis of your comments, that it’s fair to give us a half star review, though it probably is fair to say that iPartition is less useful with a software RAID if you’ve sliced it rather than using partitioning.


Wow. 8 months for a response.

Anyway, I have not tried the current version (3.4.3) but my review stands. Boot drive partitioning did not work (I did try from another drive at the time--been around Macs since 84).

The response is just a bunch of excuses. Bottom line is iPartition does not handle many situations you ought to expect AND does not protect the user well from causing undue damage. For such a utility that is inadequate, to say the least.

Chrisyboy Member IconReview+8

I bought this a while back and I don't exactly use it regularly, but whenever I do need it it never lets me down.

This time I was updating from Snow Leopard to Lion. Firstly it turned out my system disk used the older Apple partition scheme rather than GUID, which iPartition allowed me to change without deleting all the partitions (unlike Disk Utility), and then that it didn't have an EFI System Partition, which I created using iPartition.

It took a bit of time, but hey that's how it goes when you're moving sizable partitions around, but I finally managed to upgrade to Lion, and it's thanks to iPartition.

Reply5 replies
Version 3.3.1

Yeah, but it sure is expensive for a one-trick pony I'm only like to use 1-2 times, ever! :-(

B. Jefferson Le Blanc

@ Chrisyboy: I'd be interested to know how you used Snow Leopard on a non-GUID partition, since Snow Leopard and Lion are Intel only. You cannot boot an Intel Mac from an Apple Partition Map formatted volume; the latest iteration of OS X that will run on such a volume is the PPC version of OS X 10.5.8.

This does not change the fact that you may be able to change the partition scheme with iPartition without reformatting or repartitioning the drive and, thus, without losing data. Since I don't own the app I cannot speak to its capabilities. But this would be a neat trick if it can be done.


Clarification re B Jefferson Le Blanc comment.

It is possible to boot an Intel Mac from an APM formatted external drive. I have done so.
The Apple requirement for partition map refers to what is allowed for a fresh install of OS X. So, to install OS X to an Intel Mac, yes the internal drive must be partitioned GPT/GUID.
But it is possible to clone a working OSX Intel drive onto an APM formatted disk and it will boot the Intel Mac. (of course, as long as minimum OS versioning is met for the particular Mac)


@ B. Jefferson Le Blanc: Sorry, only just seen your post! It's a good question, and I'm not 100% but I'm guessing it was something to do with this: I was running Snow Leopard on my Intel iMac and using Time Machine as a backup. Then my iMac's internal drive completely failed, wouldn't even spin up. So using Time Machine I restored to another external drive so that now my iMac is essentially a dumb terminal; my system drive is a FW drive and my Time Machine drive is another. And this is how my system was when I upgraded tried to update to Lion; I'm guessing at some point during the whole process the system drive was formatted as an APM partition and because it was a restore rather than a fresh install or upgrade it worked. That's all I can really say apart from what I said before!

B. Jefferson Le Blanc

@ Chrisyboy: It may be that the external drive you used to restore your system was formatted to APM. It's highly unlikely, though, that your Intel iMac's drive was anything but GUID. Likewise, your Time Machine drive would have to be GUID - Time Machine will not use anything else and will throw up an error message if you try. The important point of your story, however, is that iPartition was able to change your APM formatted drive to GUID without destroying the data on the drive, enabling you to upgrade to Lion without doing another restore from Time Machine. That speaks to the power and stability of iPartition compared to other utilities, which is, ultimately what we need to learn from a review.

Kzx72 Member IconReview+121

Took a couple minutes to figure out but once setup, did exactly what I wanted it to.

Repartitioned hard drive from 12 to 30GB in about twenty minutes without any issue.

Beautifully designed program (and icon :)

Reply0 replies
Version 3.3.1
Albestar Member IconReview+1

Having used many partitioning apps on linux/win/osx I dare say iPartition deserves the shiny gold medal. Simply to use yet very indepth.
As a real world scenario, once I looked for a quick way to resize my bootcamp partition and I used Camptune from Paragon for that (just because their app is specific, bought it some time ago with a bunch of other tools).
My disk was immaculate, no hw or sw erros but Camptune failed at the end.
Fired iPartition and instead, voila', osx shrinked, win resized, 0 erros. It was even quicker!

Reply0 replies
Version 3.3.1
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Current Version (3.x)


Downloads 175,327
Version Downloads 29,460
Type Utilities / Backup
License Demo
Date 01 Sep 2013
Platform Intel 64 / OS X / PPC 32 / Intel 32
Price $46.95
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