You are wasting your money and wasting your time. It can actually do more harm than good. Defragging is a Windows solution to a Windows problem. Apple explicitly recommends that Mac users not do it. MacOS X defrags automatically.... I want to run a full defrag. ...
hey, if he wants to defrag an HFS system, let him.....
Hi there
I want to run a full defrag. Can I use the CDs that came with Mac to boot the system from them and run the defrag? Or do i need to make a boot cd another way?
Thanks!
Um-m-m-m, yes it does....
3. Apple doesn't explicitly say EITHER that defragging should NOT be done. ...
You are also aware that a full defrag will actually slow down your system as it's far slower to read data from a single contiguous area on an HD rather than from several areas/platters simultaneously, yes?
2. How can reading a file that's scattared on a HD be faster than reading from one single defragged file? Simply not true. The drive head has to move constantly to different parts of the disk.
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 Panther 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.
For these reasons, there is little benefit to defragmenting.
Note:Mac OS X systems use hundreds of thousands of small files, many of which are rarely accessed. Optimizing them can be a major effort for very little practical gain. There is also a chance that one of the files placed in the "hot band" for rapid reads during system startup might be moved during defragmentation, which would decrease performance.
Where? Can you link please?
Apple's support site About disk optimization with Mac OS X said:"If your disks are almost full, and you often modify or create large files, there's a chance the disks could be fragmented. In this case, you might benefit from defragmentation, which can be performed with some third-party disk utilities.
Another option is to back up your important files, erase the hard disk, then reinstall Mac OS X and your backed up files.
Uh. No.
lol
Actually, you are. If the read head is going to constantly be scanning the drive and across platters for a string of data, of course it's going too be faster for it to read if it's in a continuous string, not spread out across the drive. Especially if it's a larger capacity drive that's almost full. There have also been instances where drives have become so fragmented that they won't even boot. Seriously, do your homework before you shoot your mouth off
Take your own advice there.
Firstly, Mac OS X does its own optimization of system files. Moving them around with the intention of putting them in neat, pretty little rows may seem like a good idea, but it can actually destroy the ordering of these files.
Second, files are not static things. Oftentimes, existing files need to be modified. On a just-defragged disk, all the files are bunched up together with no room to grow. Adding data to any file means the entire file has to be duplicated somewhere else or (you guessed it) fragmented, whereas "fragmented" disks often have plenty of "in between" space all around the disk.
The idea of defragmenting files into neat little rows appeals to the obsessive-compulsive mind, but usually is just a waste of time on modern systems.
The idea of defragmenting files into neat little rows appeals to the obsessive-compulsive mind, but usually is just a waste of time on modern systems.