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How do I do hard reset to factory settings on mac

I can't use disks or disk utility to reset hard drive.

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  • mygirl802
    mygirl802 Dec 17, 2012

    Trash is not accessible. The disk images appearing are saying no file system but at the same time taking up the complete drive space so I can not install anything. I tried and was successful in terminal app un mounting the /dev/disk 1-13 that showed when I typed in list. Three of them have mount points for what appears to be actual files. /private/var/tmp /private/var/run and /Volumes. These are apparently the disk image files. I quit disk utility after un-mounting all but when started up in safe mode, they were all back. There is also a /dev/disk0. It belongs to the Hitachi original disk image and won't let me do anything. It says can not eject, is a partition with no file system and no files. Block size 152 bytes and total size 160.
    The other disk images appear to user as Mac OS X Install DVD but all are in listed in disk utility as /dev/disk#'s
    The info I get from the menu info button in utility about the disk is not the same as in list. The disk numbers are different. Example:
    all /dev/disk numbers are 0 through 13. The disk number of the disks showing mounted in utility are disk0s1, disk1s1, disk2s2 etc. and I think each one has 3 numbers and each the same numbers. Example; Disk 0s1 has disk1s1 and disk2s2. One referring to the disk image, another to the directory and ? When I type
    diskutil umount /disk1s1 /dev/disk1 for example
    I get a message back saying all volumes on disk2 successfully unmounted, suggesting that they are moving each time I reboot.
    I found the /private/var files on different disks the second attempt to unmount them. diskutil umountDisk / disk1s1 worked to unmount the image first time but not the second.
    The two that have taken up all the space both say no file system and not mounted in diskutil info disk# and say are partitions that will unmount with the rest even if not a complete part. Nothing unmounts because the files/apps are open.
    If the open files or app are referring to the actual disk utility app, can I rename or move them using something like -a -w? Two are not owner enabled.

  • mygirl802
    mygirl802 Dec 17, 2012

    I tried to eject and unmount from the menu in disk utility. I can boot up with the install CD but I have no space to install. When I open the contents, the file I need is not accessible. The same happens on the Mac Lion Recovery disk. These are all INTERNAL pseudo disks so force eject a CD is irrelevant. Erase, partition, repair do not work with could not unmount disk message.

  • mygirl802
    mygirl802 Dec 17, 2012

    When I booted up in V mode, the white text flashed and then it shut down. Too fast for me to read anything.


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Much like a PC, there isn't a magic button to do a factory reset on the computer. If you're unable to use the current hard drive, you'll need a bootable disc and boot holding the option key to select it as a boot disk. If the drive is bad, you'll need to replace it.

Posted on Dec 12, 2012

  • mygirl802
    mygirl802 Dec 17, 2012

    I can not re-install because until I get rid of the pseudo disks, I have no space on my drive.


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1 Answer

How do i restore my laptops and tablets to factory settings?

Make sure you are connected to the Internet so you can download the latest copy of Mac OS X.
  1. Use an app like SuperDuper or Carbon Copy Cloner to clone your internal hard drive to an external drive. This enables you to access all your old files, and the drive can be re-cloned to the internal drive if you want to restore your Mac.
  2. Deauthorize your iTunes store account. (You should also deauthorize any third-party apps, such as Photoshop, that are locked to your Mac).
  3. Turn off FileVault (if you are using it).
  4. Sign out of iCloud.
  5. Restart the Mac in Recovery Mode (hold down Command and the R key during restart).
  6. Use Disk Utility to erase the hard drive. Click on Disk Utility > Continue. Select the main volume and click Unmount then Erase). Quit Disk Utility (Disk Utility > Quit Disk Utility).
  7. Click Reinstall OS X and Continue. Follow the instructions to reinstall Mac OS X.

How to reset Mac restore your Mac to the original factory settings

Settings-General-Scroll down-Reset-Erase all content and settings-Then confirm. Erase All the Data From Your iPad to Make it Like New

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Formatting an external hard drive with Mac OS X's Disk Utility

Formatting your new external hard drive is not as difficult as you may think. In fact, you don't even have to be a computer techie or uber-Mac geek to perform this procedure successfully.

The tool you would use, to format your drive within your Mac OS X system, is the built-in utility application called Disk Utility.

Disk Utility is Apple Inc.'s defacto utility application, for performing disk related tasks within the Mac OS X volume.


From creating new images, to burning CDs and DVDs to formatting hard drives, Disk Utility performs well enough to keep not only your Mac OS X volume on your hard drive error free, but keep your hard drive healthy and error-free as well.

I could go on in detail, admirably describing more features of this versatile Mac OS X tool, but the purpose of this FixYa tip, is to show you how to easily format your external hard drive. So that is where I will take you now.
There are generally two formats in Disk Utility that you can use to effectively format your hard drive.

Mac OS Extended (Journaled) - if you want a Mac readable hard drive only

MS-DOS (FAT 32) - If you want your external hard drive to be read by both Mac and PC.

• First, make sure your external hard drive is connected securely to your Mac and is turned on.

•Next, from your desktop, click anywhere on a blank space on your desktop. Now you should see Finder listed near the Apple menu icon.

• From the Finder menu, click on Go, then Utilities from the
drop-down menu. This will take you to your Utilities* folder.

(*You can also get to the Disk Utility application via Applications > Utilities folder)

• Now, locate and launch the Disk Utility application.

When Disk Utility opens you will see a left side window, which will show
all connected hard drives and optical drives. It is here that you
should see your external hard drive listed in that window.


• When you locate it, simply select it and then select Partition
from the tabs on the right hand side.


• Change the Volume Scheme from Current to 1 Partition

• Make sure to provide a name for your new external hard drive.

• Select Mac OS Extended (Journaled) from the Format
drop down menu, for a bootable Mac only external hard drive.

• Or select MS-DOS from the Format drop down menu, for a bootable Mac & PC external hard drive.

From there, click the Options button, located toward the bottom of
your window.

This will open a partition scheme selection window as seen in this screen shot:


• Select GUID Partition Table for bootability on a Intel processor based

• Or select the Apple Partition Map for bootability on a PowerPC based Mac.

• Click the OK button.

Finally, click the Partition button and allow Disk Utility to format your new external hard drive.

When this process is complete, you now have a newly formatted, ready to use hard drive.

Believe it or not, this process can be completed faster than you think.
Using this method with Disk Utility, I was able to format my new 1TB Iomega USB external in less than 20 minutes.
Final Note:
I used the external hard drive as the focus for showing you how to format and prepare your hard drive for use on your Mac, but this feature can also work with internal hard drives as well.
For more information about some of the disk repairing features of Disk Utility, here is a great support link for this nifty and quite effective Apple utility for the Mac OS X platforms:

Using Disk Utility to repair a disk


Thanks for reviewing my Mac OS X Tip!



on Feb 11, 2010 | Computers & Internet

1 Answer

What do i do - my iMac 2011 won't turn on - I just hear a whiring sound every so often

Hi Noelle

Probably a bit late now.... but for others
Determine if Hardware Problem or Software.
Remove all peripheral plugs. Just in case of bad shorted device.
Restart & hold Cmd Shift Option Delete keys down. 4 Keys
Resets Parrameter Ram. Eg Clock & mouse settings.
But might help.
Reboot with Shift key Held down. (Safe Boot)
Does it boot up?
Boot with Option key down & choose "Recovery" startup just to prove hardware (CPU) is working.
Internal Hard Drive may be damaged!
Plug another Bootable drive into USB or FireWire Port and reboot with option key held down.
If you can get your Mac to boot.... Install a clean OS X onto a USB memory Stick (16 or 32gb)
Keep this for Booting Problems & Emergency Booting & access to repair software e.g. Apple Disk Utility
or My Favorite Utilities
Bootable Backup Software
Directory Repair & File Testing & Fixing
DiskWarrior 5 The Disk Utility for Mac Disk Repair Mac Directory Repair...

How about an Tick of approval for the effort?

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How to factory reset

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Mac OS X

1 Connect the Western Digital My Passport hard drive to the computer. Power on both.??

2 Open "Disk Utility," located in the Utilities sub-folder of the Applications folder.??

3 Select the drive you wish to reformat. Typically, drives appear twice; choose the furthest left.??

4 Click "Erase," and pull down the Format menu. Choose "FAT32." Enter a hard drive name, if desired.??

5 Click "Erase." A confirmation screen will appear, stating that all information on the drive will be lost if erased. Click "Erase." Once completed, the erased drive will function on both Windows and Macintosh systems.??


1 Download and install the Western Digital FAT32 Formatting Utility.??

2 Connect the Western Digital My Passport hard drive to the computer. Power on both.??

3 Open the FAT32 Formatting Utility and select the desired external hard drive. Ensure that "Restore factory original FAT32 partition" is selected.??

4 Click "Start." A warning message will appear, stating that all data on the drive will be destroyed. Click "OK" to continue. Click "Yes"' to navigate through.?

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My hard drive is a wd2500jb and its only giving me 130 gb of space. How do i get the full 250 gb?

Chances are your disk is partitioned. If it's your Operating System drive, you should reformat with your OS disc. If it's just a secondary drive, check in Disk Management (Windows) or Disk Utility (Mac/Linux) and you can re-partition the drive as you desire.
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This needs to be formatted before it can be used on a Mac.
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