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EDITOR NOTES
The demo only works on 100MB drives and smaller and remains at version 1.6.8. To get the update if you are a paying customer, select 'Check for Updates' in the iDefrag menu within the app or download here (login required).
DESCRIPTION
iDefrag helps defragment and optimize your disk for improved performance. Features include:
- Supports HFS and HFS+ (Mac OS Extended).
- Supports case sensitive and journaled filesystems.
- Supports adaptive hot file clustering ("Hot Zone").
- Four powerful defragmentation algorithms:
- Compact data, moving all free space to one place.
- Optimize filesystem metadata.
- On-line defragmentation.
- Defragment whilst your disk is mounted.
- Advanced programmable optimization.
- Rearrange your disk the way you want.
- B-Tree metadata file compaction/optimization support.
- High performance user-defined file classification engine.
- Per-block and accurate whole disk display.
- Detailed statistics so you know whether you need to optimize.
- Inspector allows you to view details of individual extents/files.
- Quickly jump to specific files to examine them in more detail.
- Altivec accelerated display for improved performance.
- Auto-update feature ensures you always have the latest version.
- Fine-grained security, just like iPartition.
- AppleScript support.
WHAT'S NEW
Version 1.7.1:
- Fixed the cause of a crash that a few customers have reported.
- Fixed the bug report panel so that it will no longer revert changes that you make to the report.
REQUIREMENTS
Mac OS X 10.3.9 or later.
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| iDefrag User Reviews (131 posts) | Write A Review |
 | Nov 5 2009 |
BUMBLEB Good answer, true about the zeroing out mapping out bad blocks.
(Version 1.7.1) | |
| [ Reply ] | |
| Sep 30 2009 |
DJEFIS I never had a problem with this software!!! N° of Defrag 50 (?), on three Mac. I don't succeed in understanding as is possible that someone complains it. They will also have their good motives, but I believe both the case not to exceed. I understand that when an utility as iDefrag it fails they are damages, but great it is the damage to have for years an approximate OS. Fortunately I am very happy to have it.... In this way nobody can understand the utility of iDefrag:To reduce the time of StartUp and the start of all the Applications, In sure and excellent way!
(Version 1.7) | |
| [ 5 Replies - Reply ] | |
Replies:
| Sep 30 2009 |
LOUNGE DELUXE I don't understand a word of what you're saying.
(Version 1.7) | |
| Sep 30 2009 |
ST00P!D M0NK3Y I don't understand what he's saying either.
(Version 1.7) | |
| Sep 30 2009 |
NICOLASD Looks like a bad google translation. Probably not the writer him/herself.
(Version 1.7) | |
| Sep 30 2009 |
ZO219 I apologize to the reviewer, not all English-speaking people are rude clods. Your feedback was valuable.
(Version 1.7) | |
| Oct 11 2009 |
DJEFIS Thanks ZO219 really I am not fine with the English language, at least I don't have anymore now doubts. However I use the Mac very fine! | |
 | Sep 3 2009 |
MAC ADAM Please update for snowleopard 64bits
(Version 1.6.9) | |
| [ Reply ] | |
 | Jun 10 2009 |
TIMBARNES Any software that deals with the low-level structure of your computer's file system has to be 1000% robust. Errors and crashes are an absolute no-no for these kinds of utilities. Unfortunately, I have had a number of hangs while using iDefrag's latest version, and I've also seen file system corruption that has required me to run utilities like DiskWarrior to repair the file system. So while I think there may well be a case for doing defragmentation from time to time, I can't recommend this application.
(Version 1.6.9) | |
| [ 2 Replies - Reply ] | |
Replies:
| Sep 30 2009 |
MITCH_DE I would ALWAYS check the volume with the buildin test volume or disk utiliy BEFORE let idefrag defrag. I use idefrag on 4 HDs for > 3 years and had never any problem or hangs. But i never let it run without check&repair(if needed) the hfs+ volume structure ! So my experience is only good with that app. Also i like that i got lot updated without paying for new version. Some companys make every year an upgrade and you must pay, that company not.
(Version 1.7) | |
| Sep 30 2009 |
ZO219 Strange how one person could have so many bad experiences, yet like another reviewer, I've used iDefrag for several years, on multiple Macs, without a single hang or a glitch, and consider it a highly useful utility.
(Version 1.7) | |
| Jun 8 2009 |
HARV I am not (yet) an iDefrag user, and my knowledge/understanding of defraging/optimization is nil, so I well understand if my question is off base. SuperDuper allows me the option to erase a drive/volume prior to copying the backup. Doesnt the erasing accomplish the same thing? I know iDefrag has more bells and whistles (some are of no benefit to me) and it may defrag faster, but as I use/schedule SuperDuper while I sleep, I see no advantage there. So for folks such as me, why use iDefrag? No offense is intended to the developers, I just dont understand.
(Version 1.6.9) | |
| [ 2 Replies - Reply ] | |
Replies:
| Sep 20 2009 |
BUMBLEB SuperDuper and iDefrag has nothing in common. iDefrag is for defragmenting your main drive.
(Version 1.6.9) | |
| Nov 5 2009 |
SNOWWHITESICKETTE I think Harv is thinking of remapping the disk, not defragging. (To fix bad blocks on a hard drive, Harv?) SuperDuper! does not remap the drive when it erases the data. You can do that with Disk Utility. In the Erase function, there is an option to write zeros to the drive. Zeroing out is what remaps any bad blocks, simply erasing does not. One pass is enough, unless there is very sensitive data being erased. Zeroing out takes a lot longer than erasing, and additional passes multiply that amount of time by the number of passes. Defragging is done as maintenance of the existing files on a drive, which would be pointless if the drive were going to be erased.
(Version 1.7.1) | |
| Jun 8 2009 |
DOM21 What exactly does the "on-line" in "on-line defragmentation" mean? Does it make your hard drive viewable or accessible to Coriolis in any way? If not, then what does it mean?
(Version 1.6.9) | |
| [ 3 Replies - Reply ] | |
Replies:
| Jun 8 2009 |
NORAA Normally when a HD is defragmented by iDefrag it needs to be unmounted. Thus you can't defrag your startup volume. "Quick (on-line)" means that the HD can be defragmented while still mounted, including your startup volume. This method only defrags individual files however, and doesn't defrag free space (a full disk optimization).
(Version 1.6.9) | |
| Jun 8 2009 |
DOM21 So is Coralis using the term "on-line" in a non-traditional sense? On-line normally means connected to the Internet.
(Version 1.6.9) | |
| Jun 15 2009 |
FAHLMAN On-Line means the Hard Drive is mounted.
(Version 1.6.9) | |
| Jun 8 2009 |
SHOTGUNWEDDINGS Where's the iDefrag 1.6.9 demo? I download from here it is 1.6.8 and I download from Coriolis website same thing. 1.6.8 demo did not work for me. Kept hanging when I launched it. It would go into a endless loop looking for drives. eMac PPC with 10.5.7
(Version 1.6.9) | |
| [ Reply ] | |
Replies:
| Jun 7 2009 |
NAOH It depends what you mean 'work with'. The short answer is 'yes'. iDefrag will defragment the data on a RAID. iDefrag will treat a RAID as just another disk. The task of mirroring or striping the information on the disks is usually handled by the RAID controller or the disk drivers in the OS. Since iDefrag doesn't take over from those, it can't see the inner workings of the RAID, and therefore is unaware of the exact nature of the disk. Instead, like most disk defragmenting tools, it will look at the data blocks as they are presented by the OS, and work with that.
(Version 1.6.9) | |
| May 14 2009 |
DANNY365 I have recently purchased iDefrag to help my PowerBook 12'' *60 GB* disk survive after several years of moderate use. The disk was about half full, and I suspected it caused some slowing down. The app. worked fine for me (nothing special, 2 hour job after booting from the disk the supplied app. created.) I do sense some quickening, not dramatic, though. I would still buy the app. not to take the risk of a fragmented disk.
(Version 1.6.8) | |
| [ Reply ] | |
| Mar 22 2009 |
DRDUL As a previous reviewer noted, running iDefrag on a Mac with Time Machine enabled results in Time Machine backing up many of the defragged files. Too bad I didn't realize this before I ran iDefrag. Time Machine is now backing up a whopping 371 GB of files, none of which have actually changed. My 1 TB Time Machine volume was full, which means I have now lost a whole bunch of backups from several months ago so that Time Machine can squeeze in 371 GB of not-at-all-new files. Because of this, I will no longer be using iDefrag. I'd rather have a fragmented disk and keep my old backups.
(Version 1.6.8) | |
| [ 1 Reply - Reply ] | |
Replies:
| Mar 23 2009 |
DRDUL A follow-up to my earlier report. I contacted Coriolis technical support, who indicated that Time Machine should not be re-backing up defragged files. They indicated that following a similar report they received earlier, they tested this and were not able to reproduce the problem I experienced. So, as always, YMMV.
(Version 1.6.8) | |
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