There are not many things I miss from Mac OS 9. But there’s one that was really useful: the ability to test a hard drive surface. OS 9 disk formatter (I don’t even recall it’s name) had a “Test Disk” option that would perform a surface scan of the selected hard drive. That was awsome to test for bad blocks on the drives.

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Unfortunately, that’s impossible to do with Mac OS X, at least with it’s built-in software. There are some commerical applications to do that (like TechTool Pro), but I get a little pissed off when I have to spend a lot of money buying a software that does a zillion things when all I want is surface scans, and specially when I could do it with the “old” OS and not with the new powerful UNIX-based one.

Well, Linux has the badblocks command that will do just that: test the disk surface for bad blocks. It’s a simple UNIX command, so I thought there must be a port of that to OS X (and, of course, I could try to compile it in OS X as last resource). After some googling, I found out badblocks is part of the ext2fs tools. And, fortunately, Brian Bergstrand has already done the port to OS X, including a nice installer.

The installer installs all the ext2fs stuff, including an extension that will allow you to access ext2fs volumes on OS X. As always, this is a somewhat risky operation. Personally, I avoid as many extensions as I can, because they run too close to the kernel for me to feel confortable. So, if possible, install it on a secondary OS (like an utility/recover system on an exteral hard drive, or so).

The badblocks command will be installed in /usr/local/sbin/badblocks, and it will probably not be on your PATH, so you have to type the entire path when using, or edit your PATH environment variable.

Usage is simple. First, run the “mount” command, so that you know the device names for the drives you want to test. You can obtain something like this:

arroz% mount
/dev/disk0s3 on / (local, journaled)
devfs on /dev (local)
fdesc on /dev (union)
on /.vol
automount -nsl [142] on /Network (automounted)
automount -fstab [168] on /automount/Servers (automounted)
automount -static [168] on /automount/static (automounted)

The internal hard drive is /dev/disk0 (note that /dev/disk0 is the entire drive, /dev/disk0s3 is a single partition). Imagining you want to test the internal hard drive you would type the command (as root):

badblocks -v /dev/disk0

Block

This would start a read-only test on the entire volume. The -v is the typical verbose setting, so you may follow what’s happening. This will take a long time, depending on the hard drive you use. For a 160 GB hard drive, it took between 2 and 3 hours in a G5 Dual 2 Ghz.

I mention this because time is an important factor when testing hard drives! You should run badblocks on a known-to-be-in-good-condition hard drive, so that you can get the feeling of how fast (or slow) badblocks is. Later, if you test a possibly failing hard drive, and badblocks progresses notably slower, it will probably mean that the hard drive is in bad condition (even if it doesn’t have badblocks).

After running the command, you may get two results: your disk has, or hasn’t badblocks! 🙂 You will see many outputs of a successful surface scan, so I leave here an example of a not-so-successful one:

/usr/local/sbin arroz$ sudo ./badblocks -v /dev/disk0
Password:
Checking blocks 0 to 156290904
Checking for bad blocks (read-only test): 120761344/156290904
120762872/156290904
120762874/156290904
done
Pass completed, 3 bad blocks found.

This is the result of a test on a 160 GB hard drive with 3 bad blocks.

After getting something like this, you may try to run badblocks again, in write mode. Note that this will destroy all the information you have on the hard drive! badblocks won’t copy the information to memory, and than back to disk. It simple destroys it. The point of running a write-enabled badblocks check is forcing the hard drive to remap the damaged sectors. Hard drives have a reserved space to use when bad blocks are found. The bad blocks are remapped to that reserved space, until it fills. And this will only happen on a write. So, run badblocks in write mode, and then again in read-only mode. If badblocks finds no bad blocks, your hard drive is fine (for now). If badblocks still finds bad blocks, it means that there are so many damaged blocks on the disk surface that the reserved area is full. Forget it, and throw the disk away. It’s useless.

There are people on this earth who take sadistic pleasure in pestering others, and the phone is the best tool to annoy somebody; if you frequently receive such prank calls or if somebody abuses you on phone, there is a way you can block such pranksters. But what if you want to block a FaceTime call and iMessages on the Mac? We have a solution for this too.

How to Block iMessages on Mac

Step #1. Click on Messages on your Mac from the dock.

Block Max Mac OS

Step #2. Sign in with your Apple ID.

Step #3. Now click on Messages from the top menu.

Step #4. Select and click Preferences.

Step #5. Click on your accounts → Click on your Apple ID.

Block Max Mac Os 11

Step #6. Click on Blocked tab next to Settings.

Step #7. Now click on “+” symbol.

Step #8. Now add contact/s you want to block from your Contacts.

Please note that this action will block all methods of contact for a particular person you have blocked.

How to Unblock iMessages on Mac

You can unblock the contact by selecting the blocked contacts and clicking on the “-” sign.

FaceTime is an amazing feature on iPhone; but when somebody frequently annoys you by making FaceTime calls, you need to block such calls. This app has been used by users since 2010 when Apple launched it’s iPhone 4.

How to Block FaceTime Calls on Mac

Step #1. Click on the FaceTime app from the dock.

You can see a list of callers under the search bar. If you have a number of callers, you can use a search bar to search a name, email or number.

Step #2. Search the caller you want to block.

Block Max Mac Os X

Step #3. Now right click on the caller name. Caller info card will appear with five options: FaceTime, FaceTime Audio, Remove from Recent, Block this Caller, and Show contact card.

Step #4. Click on Block this Caller.

This will block the FaceTime caller.

To unblock the caller, right-click the contact name and click on Unblock this caller.

That’s all!

Do share your feedback with us in the comment below.

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