Pure Linux iMac Boot - Revision history

TomHutchison: /* Zeroing the Hard Drive */

2020-11-03T16:07:13Z

‎Zeroing the Hard Drive

2020-11-03T16:02:49Z

‎Zeroing the Hard Drive

2019-10-14T05:39:37Z

2019-10-14T05:38:39Z

2018-03-10T20:20:31Z

‎Zeroing the Hard Drive: pre tag

2018-02-16T18:01:12Z

‎Zeroing the Hard Drive

2018-02-16T17:56:13Z

‎Preliminary Work in OS X: hint

2018-02-16T17:54:45Z

‎Disclaimer. Warning. Caution. Caveat.: warning

2018-02-16T16:42:17Z

‎Removing the Boot Delay: custom title

2018-02-16T16:20:22Z

‎Removing the Boot Delay: note boxes

← Older revision		Revision as of 16:07, 3 November 2020
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	It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.		It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.

−	[[Category:Linux]][[Category:iMac]][[Category:EFI Boot]]{{keywords\|linux,iMac,boot,partitioning,EFI boot}}{{description}}[{ogmeta}}	+	[[Category:Linux]][[Category:iMac]][[Category:EFI Boot]]{{keywords\|linux,iMac,boot,partitioning,EFI boot}}{{description}}{{ogmeta}}

← Older revision		Revision as of 16:02, 3 November 2020
Line 505:		Line 505:
	It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.		It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.

−	[[Category:Linux]][[Category:iMac]][[Category:EFI Boot]]{{keywords\|linux,iMac,boot,partitioning,EFI boot}}{{description}}	+	[[Category:Linux]][[Category:iMac]][[Category:EFI Boot]]{{keywords\|linux,iMac,boot,partitioning,EFI boot}}{{description}}[{ogmeta}}

← Older revision		Revision as of 05:39, 14 October 2019
Line 505:		Line 505:
	It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.		It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.

−	[[Category:Linux]][[Category:iMac]][[Category:EFI Boot]]{{keywords}}{{description}}	+	[[Category:Linux]][[Category:iMac]][[Category:EFI Boot]]{{keywords\|linux,iMac,boot,partitioning,EFI boot}}{{description}}

← Older revision		Revision as of 05:38, 14 October 2019
Line 505:		Line 505:
	It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.		It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.

−	[[Category:Linux]][[Category:iMac]][[Category:EFI Boot]]	+	[[Category:Linux]][[Category:iMac]][[Category:EFI Boot]]{{keywords}}{{description}}

@@ Line 499: / Line 499: @@
 Go through the keyboard detection, but don’t bother with anything else — as soon as you see a <code><go back></code> option, use that to get to the rescue menu. Select <strong>Execute a shell in the installer environment</strong>, and you’ll be presented with a prompt that’s just a <code>#</code> (ie. root access). Assuming your hard drive is <code>/dev/sda</code>, this command will zero out the first GB of the hard drive. That should cover the master boot record (MBR), the GUID partition table (GPT), and any other magic that interferes with partition/OS detection:
-</pre>
+<pre>
 # dd if=/dev/zero of=/dev/sda bs=16M count=64
 </pre>

← Older revision		Revision as of 18:01, 16 February 2018
Line 504:		Line 504:

	It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.		It will <strong>not</strong> touch the Mac’s internal bootloader firmware, nor will it reset any nvram variables such as the internal speaker volume.
		+
		+	[[Category:Linux]][[Category:iMac]][[Category:EFI Boot]]

@@ Line 64: / Line 64: @@
 ==Preliminary Work in OS X==
-If you still have OS X installed, this is a good time to create a [http://support.apple.com/kb/HT4848 recovery disk]. And also make those backups
+{{hint|If you still have OS X installed, this is a good time to create a [http://support.apple.com/kb/HT4848 recovery disk]. And also make those backups
-I told you to make.
+I told you to make.}}
 ===That Stupid Startup Noise===

@@ Line 47: / Line 47: @@
 ==Disclaimer. Warning. Caution. Caveat.==
-This process will wipe OS X and any other data you have on the machine. All of it. That’s the whole point. Make backups. I’m pretty sure this won’t brick a machine (ie. break it irrepairably). But only pretty sure. If all else fails, you should always be able to reinstall OS X from a recovery disk. But there might be subtle differences between machines that make it harder for you to back out if something goes wrong. Therefore, I really don’t recommend trying this unless you’re reasonably proficient with this sort of thing in general. So as a parallel to the equipment list above, here’s a checklist of concepts that shouldn’t phase you:
 <ul>
 <li>You should absolutely be comfortable working from a command line.</li><li>You should not be afraid to work from a GRUB command line.</li><li>You should understand how to identify disks on a live/installer system (ie.

@@ Line 479: / Line 479: @@
 …and now, when you reboot, it should be significantly faster.
-{{note|When I initially searched for a fix for this, I read a lot of posts claiming that using the OS X recovery disk to bless the partition would do the trick. But as far as I can tell, this has no effect, so don’t panic if you don’t have a recovery disk.}}
+{{note|When I initially searched for a fix for this, I read a lot of posts claiming that using the OS X recovery disk to bless the partition would do the trick. But as far as I can tell, this has no effect, so don’t panic if you don’t have a recovery disk.|subject=Note #1}}
-{{note|I am not talking about the usual GRUB delay here. In theory, this can be changed by editing <code>/etc/default/grub</code> and setting all the timeout values to <code>0</code>. However, [https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1273764 bug #1273764] stops this from working, so use [https://gist.github.com/LeahCim/9332432 LeahCim’s extra GRUB scripts] to fix it.}}
+{{note|I am not talking about the usual GRUB delay here. In theory, this can be changed by editing <code>/etc/default/grub</code> and setting all the timeout values to <code>0</code>. However, [https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1273764 bug #1273764] stops this from working, so use [https://gist.github.com/LeahCim/9332432 LeahCim’s extra GRUB scripts] to fix it.|subject=Note #2}}
 ==You’re Done!==