I have no Firewire drives, Time Machine backup, blank DVDs, etc.
This saved my day!! I have a late-model 1.67GHz Powerbook which was ruined beyond Disk Utility's reach, due to a frozen OS update that forced me to power down. Type dev / ls to get the device tree list. Restart your iMac while holding down Command+Option+O+F. Also you can check it on Disk Utility, select the hard drive - right click on it and select 'Information,' and write down the 'Partition Number.'Ĩ. This might be disk1s3 in which case the partition number is 3. an MacOSX DVD or DMG restored to a partion with Disk utility's restore). Determine the partition where your bootable image it situated (e.g. Then drag the appropriate partition (in my case, the USB external drive) to the destination field.Ħ. Select the Restore tab of Disc Utility and drag the Disk Image (or the DVD in case you have an external drive) for the Installation Media onto the Source field.ĥ.
Once the drive is in the Apple Partition Map scheme.Ĥ. Make sure that the drive is formatted using an Apple Partition Map scheme, not GUID or MBR (you may need to reformat your drive to get it in this form). Select the drive in Disk Utility and then select the Partition tab. Connect your external drive and launch Disk Utility.ģ. Note: you can skip this step and make the restore directly from theDVD - just dragging the DVD into the Source field - explained in step 4.Ģ. In my case I used an external DVD (Dual Layer) drive with the Installation media to make the image - because the system doesn't recognize that drive in the Startup Manager (when I restart it while holding down Option key), neither was listed at System Preferences » Startup Disk.
Start by creating the disc image of the installation media (this can be DMG, CDR, ISO or any of the disc image formats supported by Mac OS X).
This works for PowerPC Macs that don't have a Dual Layer DVD, and you wish to install Leopard using an external USB Drive instead.ġ.
If you booted from a USB disk, click “Continue” to advance to the installer.After doing a lot of research and trying out some hints, finally I could install Mac OS X 10.5 Leopard on an iMac G5 1.8 GHz, and I would like to share with you the solution that I got. If you booted from a functioning recovery partition, click the “Reinstall macOS” button. With your information wipe complete, you are now ready to reinstall macOS. If you choose three or five passes, you might want to leave this running overnight. If you opted to wipe your drive securely, this might take a while-30 minutes to an hour is not unreasonable for one pass. Just give your drive a name (I recommend “Macintosh HD”, just for consistency’s sake), then click “Erase” to start the overwriting process. You only need to write over a drive once to securely wipe it, but if you’re paranoid you can also wipe it three or five times.Ĭlick “OK” once you’ve decided, but remember: if your Mac has a solid state drive, you do not need to use these options. Now move the dial up, to randomly write data over your entire drive. You still need to wipe the drive, however, or your files will remain in place, so skip to the end of this step to do so.) (If your Mac has a solid state drive, you can skip this part: your SSD will already securely erase files thanks to TRIM. If you’re wiping a mechanical drive, click “Security Options” in the window that pops up. Click your primary drive, then click “Erase” If not you can find Disk Utility in the menu bar: click Utilities then Disk Utility. To get started, click the Disk Utility option.ĭepending on how you started Recovery Mode, you may be presented with the option to start Disk Utility right away, as seen above.
We’ve shown you how to securely wipe a hard drive with your Mac, and doing so in Recovery Mode isn’t really different from doing so within macOS. If you want a truly clean installation, however, you need to first wipe your hard drive. We recommend backing up files before you do this, just in case, but otherwise you’re ready for step three. Your user accounts and files will stay exactly where they are-only your operating system will be overwritten. If you want to re-install your operating system, but leave your files in place, you can skip this step. RELATED: 8 Mac System Features You Can Access in Recovery Mode Step Two: Securely Wipe Your Hard Drive (Optional) Once you’ve managed to open up the Recovery Mode in some fashion, we can move on to wiping your drive securely. You can access recovery without a partition using Network Recovery: hold Command+Shift+R while turning on your Mac and it will download the Recovery features for you. Failing that, you can create a bootable USB installer for macOS Sierra, and boot from that by holding “Option” while turning on your Mac.
If neither of these options work, don’t panic! You’ve got a couple of options yet.