Restore it from backup if you have to, or try to open it using an alternate program and then resave it to restore its contents in a fresh file format. To address file corruption, your best bet is to find a way to replace the file. Therefore, even if a file's permissions differ from Disk Utility's expectations in its permissions database, the files may still be perfectly accessible. Usually processes just need to be able to access a file, and there are many permissions permutations that can result in granting proper access to the file. To fix permissions problems you can run a permissions fix on the boot drive using Disk Utility however, do keep in mind that the requirements for permissions are, for the most part, much less strict than filesystem or physical drive integrity.
#Disk warrior vs drive genius manual#
This can happen from system migration, manual alteration of files (especially with untested software), and installing applications and system updates. These are mainly permissions problems, where files may not be accessible because some action you performed on your system altered the permissions of a files, but can also be seen in file corruption. The last potential problem with hard drives are file-related issues that have more to do with the system and the way you use it rather than the drive itself.
In these cases you can try to fix the disk using Disk Utility's Repair Disk routine (you will have to run this from the OS X installation DVD for your boot drive), but your best bet would be to use a more robust volume management tool like Disk Warrior. To address file-system problems you can use Disk Utility's "Verify Disk" routine to check the disk's catalogue files, which should complete and give entry miscounts, unexpected numbers of entries, or other errors with "b-tree," "extents, " or "volume bitmap" files. Each volume on the drive contains a number of directory files on it that are used to catalog where the data is stored, and these files may get corrupted through abusive use and result in the inability to locate data. It may also happen if you perform routines like resizing or creating new drive partitions. These may happen through regular use of the system, especially if you experience any system crashes, power outages, or other problems that result in the sudden and unexpected ejection of your drive. One additional thing to consider is that while it may be possible to get the drive working again, drives are cheap and replacing a faulty one may be a far easier and lower risk task than fixing a bad one.īeyond physical problems are issues with the filesystem setup on the drive (the formatting), which like physical problems can also result in hangs or crashes. If you decide to run a "Verify Disk" routine with Disk Utility or other file-system management tools, you may find the disk repair routine will not be able to complete.
#Disk warrior vs drive genius pro#
If you suspect physical problems in a drive, either by major pauses in the system, kernel panics, or numerous I/O errors in the system logs (you can check this with the Console application), then your best bet is to immediately back up your files and then use a robust utility like TechTool Pro, Drive Genius, or Disk Tools Pro to run diagnostics on the drive. is a bit hit-or-miss as it many times does not detect defects in a drive. monitoring tools (including Disk Utility), but the use of S.M.A.R.T. technology may kick in and issue a warning to any S.M.A.R.T. If this happens, then the drive's S.M.A.R.T. Physical problems with hard drives include I/O errors that can happen because of bad blocks, overheating, or problems with the drive's firmware or controllers that result in an inability to read data. Unfortunately this is not the case, and it may help to understand various realms of where problems may happen on hard disks. Some people may take this to mean that if they get other problem warnings in Disk Utility, like file-system errors when running Disk Utility's Verify Disk routine, then they can similarly fix it by reinstalling their OS. Apple lumps the management of some of these problems into its Disk Utility program, which is convenient but does have the effect of blending their meanings together, such as assuming a permissions fix and a disk fix are the same thing.įor example, if you are experiencing permissions errors, then if you reinstall your OS, you likely will eliminate the problems. All of these can result in the inability to read or access files, and may, depending on the severity, result in anything from errors and brief pauses to system hangs or crashes. When managing your hard drive in OS X there are several potential problems that can crop up, including issues with the drive itself as well as those pertaining to the file setup on the drive.
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