5 Replies Latest reply: Jun 30, 2014 11:27 PM by Eric Welch1
lime-iMacG3 Level 1 (20 points)



the title says it, can DiskTool Pro do any harm?


I often find people say, you do not need extra maintenance/disk utilities other than the ones included in Mac OS X and that third party thing often can do more harm than good and also mostly do, what disk utility does anyway.


I found an article here by one member that made a list of what and what not to do, but I can find it anymore. (it seemed to be one person here, who has big knowledge about it and had already written a guide for it).


When I look into DiskTool Pro, 3.8.3 (I havent used it yet) I see some things like "repair permissions" which is allready in disk utility.

But there is "testing for bad sectors" as well and from using SMART Uitlity, I learned that Mac OS X does even do a very bad job in finding them, when the HDD is allready clustered with bad sectors.

Then there is "show SMART status", which should allready include showing bad sectors, right? (Which I have volitans SMART Utility for, already.)


Then there is defrag, you allways here, OS X does that on it's own, with every restart. But then I hear people do a complete new install every one to two years and their drive gets faster. Then again I hear, defraging some files can lead to Mac OS X not finding them anymore (breaking the system).


Thanks in advance!

PowerMac, Mac OS X (10.4.11), PowerMac G4 AGP or Gigabit Ethernet
  • Klaus1 Level 8 (47,775 points)

    I am not familiar with the application, but it has not had good reviews:




    Much of it is superfluous, and in the old days when I was running Tiger all I had to do was keep my hard drive at least 35% free, and I never, ever had to do a reinstall of Tiger. That is such a 'Windows thing' to do!


    But whether it can or will do any harm? No idea!


    As for defragging, this is not normally carried out on a Mac as OS X mostly does this itself.


    Frankly, I would file it under the general heading of 'waste of money' - like most commercial utilities.

  • lime-iMacG3 Level 1 (20 points)

    Thank you!


    The bad Amazon reviews are more about critizising the company/support, but not about the features.


    Well, I understood OS X does self-defragmentation, but people seem to say, that after years of use some hurdle adds up and OS X is not able to handle every defragmented file.


    Also I remember there were some nightly task done by Mac OS X in the background. Was chron-jobs he right word?



    PS: is it right to put the comma in front of "that" in this sentence?

  • Klaus1 Level 8 (47,775 points)

    OS X performs 'cron jobs' at night if you leave the Mac running (not if you sleep it).


    The best way to 'clean up' you files is to clone your entire startup hard drive to an external drive, delete the startup drive, then clone back. If you want guidance on this, post back.


    Here is the full nine yards:


    Defragmentation in OS X:


    http://support.apple.com/kb/HT1375  which states:


    You probably won't need to optimize at all if you use Mac OS X. Here's why:

    • Hard disk capacity is generally much greater now than a few years ago. With more free space available, the file system doesn't need to fill up every "nook and cranny." Mac OS Extended formatting (HFS Plus) avoids reusing space from deleted files as much as possible, to avoid prematurely filling small areas of recently-freed space.
    • Mac OS X 10.2 and later includes delayed allocation for Mac OS X Extended-formatted volumes. This allows a number of small allocations to be combined into a single large allocation in one area of the disk.
    • Fragmentation was often caused by continually appending data to existing files, especially with resource forks. With faster hard drives and better caching, as well as the new application packaging format, many applications simply rewrite the entire file each time. Mac OS X 10.3 onwards can also automatically defragment such slow-growing files. This process is sometimes known as "Hot-File-Adaptive-Clustering."
    • Aggressive read-ahead and write-behind caching means that minor fragmentation has less effect on perceived system performance.

    Whilst 'defragging' OS X is rarely necessary, Rod Hagen has produced this excellent analysis of the situation which is worth reading:


    Most users, as long as they leave plenty of free space available , and don't work regularly in situations where very large files are written and rewritten, are unlikely to notice the effects of fragmentation on either their files or on the drives free space much.


    As the drive fills the situations becomes progressively more significant, however.


    Some people will tell you that "OSX defrags your files anyway". This is only partly true. It defrags files that are less than 20 MB in size. It doesn't defrag larger files and it doesn't defrag the free space on the drive. In fact the method it uses to defrag the smaller files actually increases the extent of free space fragmentation. Eventually, in fact, once the largest free space fragments are down to less than 20 MB (not uncommon on a drive that has , say only 10% free space left) it begins to give up trying to defrag altogether. Despite this, the system copes very well without defragging as long as you have plenty of room.


    Again, this doesn't matter much when the drive is half empty or better, but it does when it gets fullish, and it does especially when it gets fullish if you are regularly dealing with large files , like video or serious audio stuff.


    If you look through this discussion board you will see quite a few complaints from people who find that their drive gets "slow". Often you will see that say that "still have 10 or 20 gigs free" or the like. On modern large drives by this stage they are usually in fact down to the point where the internal defragmentation routines can no longer operate , where their drives are working like navvies to keep up with finding space for any larger files, together with room for "scratch files", virtual memory, directories etc etc etc. Such users are operating in a zone where they put a lot more stress on their drives as a result, often start complaining of increased "heat", etc etc. Most obviously, though, the computer slows down to a speed not much better than that of molasses. Eventually the directories and other related files may collapse altogether and they find themselves with a next to unrecoverable disk problems.


    By this time, of course, defragging itself has already become just about impossible. The amount of work required to shift the data into contiguous blocks is immense, puts additional stress on the drive, takes forever, etc etc. The extent of fragmentation of free space at this stage can be simply staggering, and any large files you subsequently write are likely to be divided into many , many tens of thousands of fragments scattered across the drive. Not only this, but things like the "extents files", which record where all the bits are located, will begin to grow astronomically as a result, putting even more pressure on your already stressed drive, and increasing the risk of major failures.


    Ultimately this adds up to a situation where you can identify maybe three "phases" of mac life when it comes to the need for defragmentation.


    In the "first phase" (with your drive less than half full), it doesn't matter much at all - probably not enough to even make it worth doing.


    In the "second phase" (between , say 50% free space and 20% free space remaining) it becomes progressively more useful, but , depending on the use you put your computer to you won't see much difference at the higher levels of free space unless you are serious video buff who needs to keep their drives operating as efficiently and fast as possible - chances are they will be using fast external drives over FW800 or eSata to compliment their internal HD anyway.


    At the lower end though (when boot drives get down around the 20% mark on , say, a 250 or 500 Gig drive) I certainly begin to see an impact on performance and stability when working with large image files, mapping software, and the like, especially those which rely on the use of their own "scratch" files, and especially in situations where I am using multiple applications simultaneously, if I haven't defragmented the drive for a while. For me, defragmenting (I use iDefrag too - it is the only third party app I trust for this after seeing people with problems using TechToolPro and Drive Genius for such things) gives a substantial performance boost in this sort of situation and improves operational stability. I usually try to get in first these days and defrag more regularly (about once a month) when the drive is down to 30% free space or lower.


    Between 20% and 10% free space is a bit of a "doubtful region". Most people will still be able to defrag successfully in this sort of area, though the time taken and the risks associated increase as the free space declines. My own advice to people in this sort of area is that they start choosing their new , bigger HD, because they obviously are going to need one very soon, and try to "clear the decks" so that they maintain that 20% free buffer until they do. Defragging regularly (perhaps even once a fortnight) will actually benefit them substantially during this "phase", but maybe doing so will lull them into a false sense of security and keep them from seriously recognising that they need to be moving to a bigger HD!


    Once they are down to that last ten per cent of free space, though, they are treading on glass. Free space fragmentation at least will already be a serious issue on their computers but if they try to defrag with a utility without first making substantially more space available then they may find it runs into problems or is so slow that they give up half way through and do the damage themselves, especially if they are using one of the less "forgiving" utilities!


    In this case I think the best way to proceed is to clone the internal drive to a larger external with SuperDuper, replace the internal drive with a larger one and then clone back to it. No-one down to the last ten percent of their drive really has enough room to move. Defragging it will certainly speed it up, and may even save them from major problems briefly, but we all know that before too long they are going to be in the same situation again. Better to deal with the matter properly and replace the drive with something more akin to their real needs once this point is reached. Heck, big HDs are as cheap as chips these days! It is mad to struggle on with sluggish performance, instability, and the possible risk of losing the lot, in such a situation.

  • lime-iMacG3 Level 1 (20 points)

    Klaus, thank you very much! That's a nice find. Thank you very much!


    I have a big drive in my ibook G4 12", 1,33GHz, mid 2005 , already. A WD 320GB IDE drive. I puchased it used for 35,-EUR in 2010. Today these drives from the same year and used cost 90-150,-EUR used on EBay. Since sellers ran already out of stock and WD does no longer produce it.

    But I agree for towers the drive choice is fairly easy and cheap.


    I have filled 31% of the Drive. So that might not be the issue. Also I use SuperDuper for a long time and lately did make a backup and played it back, because I read earlier, that it defrags all files.


    When I think of it, there is actually not really an issue I could name. I guess I just wanted to be super sure, that there is not something slowing down the system, that I could have changed.

  • Eric Welch1 Level 1 (25 points)

    Also remember, NEVER defragment SSDs. It destroys them.