Scan bad blocks mac os x

To the best of my knowledge, no other tool on the market can detect that. With all that said, regarding other tools, the idea of using an old MS-DOS based tool such as Spinrite or something from a Linux distribution is likely impractical for most Mac users. I would be willing to bet most Mac users aren't even sure what Linux is, and they often likely don't know or want to know how to specifically isolate a drive so a product with its origins in MS-DOS can work, and potentially damage their drive.

Such tactics may be OK with hard core techies, but they're utterly impractical for most people. I would also add that applications that appear to be doing little more than exec'ing system calls to the command line version of Disk Utility aren't terribly impressive, IMHO. Before you start doing anything like this, open Console. A typical way to do this is to use Time Machine to create a backup, and then change the drive and then reinstall OS X anew, and tell the installer to reestablish from Time Machine.

Personally I used a simple shell script that went through all files on disk and used dd to read them and print any read errors while continuing.


  1. Reviving a Hard Drive for Use With Your Mac.
  2. Fix random lengthy pauses in OS X by correcting bad blocks;
  3. Check Hard Drive Health of a Mac with Disk Utility;
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I then renamed the files containing the bad blocks so I would not use them again. Try to use stellar drive defrag. We're looking for long answers that provide some explanation and context.

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Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed. Disk Warrior is for repairing index files on drives that have corrupted index files. A corrupted index file often makes the drive unusable. Drive Genius can do some index repair but it's best known for defragmentation. Its surface scanning is very basic.

An entire list of drive testing tools can be found at the following:. Do you recommend Scannerz? If so, please add some technical explanation for the recommendation; and consider a separate answer. I can't vote up this answer whilst DiskWarrior is amongst the three products. I'm not sure "recommending" products on this forum is really appropriate, since it might be taken as spam. What I will do is tell you my own experience with Scannerz and another "famous" much more expensive tool. We had several older systems in house, all PPC, all running Leopard that we needed to sell.

Several of these items about 5 if my memory serves me correctly were showing what I could only call odd behavior. They would periodically give us the spinning beach balls, lock up a little, etc.

1. Disk Utility

We ran the "famous" tool on them to do diagnostics, and AHT on at least 3 of them. They all came back with a clean bill of health.

10 Worst Mac Hard Disk Drive Problem with Solutions

I thought, "Well, it must be my imagination. We gave these things a 90 day warranty so our only option was, at the customers discretion, either refund the money and the shipping costs, or repair the systems at our expense and ship them back. In each case, it was the exact same problem: the hard drive either failed or was in the process of failing and neither the "famous" tool or AHT picked it up.

We had more units to process, and having learned my lesson, this time we ran across some more units with similar problems. I did this while using the "famous" tool. Scannerz was new on the market and it was cheap, so I figured I might as well give it a shot. Scannerz was picking up every single problem plus others! It was not missing the problems the "famous" tool missed.

In addition I found that if a unit had a bad internal drive cable, I could open the unit up, start a Scannerz session, and probe the cable with a non-conductive probe and Scannerz would either start tossing out tons of errors or irregularities. The only tools I will use are Disk Warrior for fixing drive index problems Disk Utility, for some reason, won't touch, and Scannerz for evaluating drive problems. That's my choice. If errors occurred, you probably won't be able to use the drive.

You can try repeating the entire process, but it will take a great deal of time, and the chances of success are slim. Now that you have a working drive, you may wish to put it in service right away.

How To Check Your Mac Hard Drive Health

We can't say we blame you, but if you're going to be committing important data to the drive, you may wish to run one more test. This is a drive stress test, sometimes referred to as a burn-in. The purpose is to exercise the drive, by writing and reading data from as many locations as possible for as much time as you can spare.

The idea is that any weak spot will show itself now instead of sometime down the road. There are a few ways to perform a stress test, but in all cases, we want the entire volume to be written to and read back. Once again, we will use two different methods. When the test is complete, if no errors are listed, you can feel confident that your drive is in very good shape and can be used for most activities.

Once the erasure is complete, if Disk Utility shows no errors, you're ready to use the drive knowing it's in great shape. Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About. He is the president of Coyote Moon, Inc. You can find out more about external drive enclosures in our guide:.

On to the process of reviving the drive. With the patient, er, drive hooked up to your Mac, we're ready to start the revival process.

Part 2. Replace the Disk with a Good/Bigger One

Make sure the drive is powered on and connected to your Mac. The drive will appear on the Desktop , indicating that it mounted successfully, or you'll see a warning message about the drive not being recognized.

Mac Hard Drive scan for errors, Scan for bad Sectors How To Windows

If you see this warning, you can ignore it. What you don't want to want is Door 3, where the drive doesn't show up on the Desktop and you don't see any warning. If that happens, try shutting down your Mac, powering off the external drive, and then restarting in the following order. Turn the external drive on. Wait for the drive to get up to speed wait a minute for good measure. Start up your Mac. If the drive still doesn't appear, or you don't get the warning message, there are still a few more things you can do.

You can try shutting down the Mac, and changing the external drive to a different connection, using a different USB port, or changing to a different interface, such as from USB to FireWire. You can also swap out the external for a known good drive, to confirm that the external case is working correctly. If you still have problems, then it's unlikely that the drive is a candidate for revival.


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In Disk Utility's list of drives, locate the one you are attempting to revive. Externals usually show up last on the list of drives. If you are unsure which drive is which, simply unplug the external drive and see which one disappears from the list. Then plug it back in again to confirm it reappears.

Defragment the hard disk and check for errors | Mac OS X

The last thing you want is to erase the wrong drive. Select the drive; it will have the drive size and manufacturer's name in the title. Click the Erase tab. Give the drive a name, or use the default name, which is Untitled. Click the Erase button. You will be warned that erasing a disk deletes all partitions and data. Click Erase. If all goes well, the drive will be erased and will appear in the Disk Utility list with a formatted partition with the name you created, above. Quit Disk Utility, if it's running. In the list of devices, select the hard drive you're attempting to revive.

Click the Start button. So, as things stand: to verify the sectors of a disk on USB with OS X , we're probably limited to using utilities that may cause relocation.


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I can't estimate the degree of risk of associated dataloss, but if that risk is acceptable then I should steer first towards:. The OS alone can not use S. If you try this KEXT with Lion then — as with any third party kernel extension — proceed with caution. From the official man page :. It will attempt to map the blocks with errors to names, similar to the -B option. Only way to really know is to write to each sector and read it back to see if you get the same thing back, checking for errors on the way.

It is also non-destructive but I'm not sure if it actually writes to each sector to test. This Superuser answer suggests that SpinRite 6 may also do the same thing but I haven't tested. Home Questions Tags Users Unanswered. Ask Question. JakeGould 34k 10 10 gold badges silver badges bronze badges. It's sometimes inappropriate to use the automatic sector relocation capabilities of a drive, so the question raised by ohho becomes distinctive: it's about discovery.

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