The bootable Mac OS X Snow Leopard Install DVD-ROM is important if your Mac ever refuses to boot like normal. If you don’t have a bootable DVD-ROM — preferably a Mac OS X Snow Leopard Install DVD-ROM — call Apple or your Apple dealer to arrange for a replacement.
To boot your Mac from a DVD-ROM installation disc, follow these steps:
(Apple just changed this behavior with 10.12.4, but if you’re using Internet Recovery for a clean install on an erased drive, the new behavior should be active as it will be pulled from the. Click “Clone” to start the cloning process. The content of the USB drive will be overwritten and replaced with the clone of the boot drive. Booting from a USB Drive. Once you’ve installed macOS on a USB drive or cloned your hard drive to a USB drive, you will need to restart your computer and boot from the clone drive. Insert the Mac OS X Install DVD into the DVD drive. If your Mac uses a tray to hold the DVD, make sure that it retracts and that the disc is in. If you have a tray-loading DVD-ROM drive and it’s closed, you can get it to open by restarting (or starting up) your Mac while pressing the mouse button. May 15, 2020 Before you format hard drive without OS, you could prepare a bootable media so to boot the computer and then format hard drive with partition manager contained. A bootable media including ISO file, USB flash drive and CD/DVD, based in Windows PE (Windows Pre-installation Environment), can load an operating system and run the partition manager.
- Insert the Mac OS X Install DVD into the DVD drive.If your Mac uses a tray to hold the DVD, make sure that it retracts and that the disc is in.If you have a tray-loading DVD-ROM drive and it’s closed, you can get it to open by restarting (or starting up) your Mac while pressing the mouse button. Continue pressing until the drive tray pops out; then release.
- Shut down or restart your Mac.If you shut it down, wait a few seconds and then start it up the usual way.Paragon Driver for macOS (10.10 and above) This driver provides write access for Seagate external drives in Mac OS without having to reformat. Seagate has evaluated current product lines to determine which ones will be supported in macOS 10.15. Older drives that are not listed here may work, but have not been tested. Notes: This is a general compatibility article and not a troubleshooting article. If the drive is not being detected by the computer, click here to see this article. Format your Seagate hard drive to Mac OS Extended (Journaled) file system and And use your Seagate hard drive for a Time Machine backup of your MacBook Pro, MacBook Air or iMac. Plus you can drag and drop your files. Copy and paste your files to and from your Seagate external hard drive onto your Mac.
- Press and hold down the C key immediately, and keep it pressed until your Mac either boots from the DVD or doesn’t.If it does boot from the DVD-ROM, you see a Welcome screen.If it doesn’t boot, you see a prohibitory sign, spinning-wheel-of-death, or kernel panic alert. . . anything but the first screen of the Mac OS X Installer, the login window, or the Finder. Any of those is your cue to try Step 4.
- If your Mac doesn’t boot after Step 3, hold down the Option key while booting to display the built-in Startup Manager.Use the built-in Startup Manager when you boot from a DVD.It displays icons for any bootable discs that it sees and allows you to select one (including the installation DVD).
- Click the DVD-ROM icon to select it, and then press Return or Enter to boot from it.This technique is quite useful if your usual boot disk is damaged or having an identity crisis during startup.
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If you can’t boot from DVD then either you just installed something new that’s aggravating your Mac, or your Mac needs to go in for repairs (usually to an Apple dealer).
To get your Mac up and running again, you can try any of the following:
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- Call the tech-support hotline: Before you drag it down to the shop, try calling 1-800-SOS-APPL, the Apple Tech Support hotline. The service representatives there may be able to suggest something else that you can try. If your Mac is still under warranty, it’s even free.
- Ask a local user group for help: Another thing you might consider is contacting your local Macintosh user group. You can find a group of Mac users near you by visiting Apple’s User Group Web pages.
- Try Dr. Mac Consulting: You can check out consulting services or call 408-627-7577. A team of expert troubleshooters does nothing but provide technical help and training to Mac users, via telephone, e-mail, and/or Internet-enabled remote-control software.
- Check whether you have RAM issues: If you have problems immediately after installing random-access memory (RAM) — or any new hardware, for that matter — double-check that the RAM chips are properly seated in their sockets. (Warning: Don’t forget to shut down your Mac first.) With the power off and your Mac unplugged, remove and reinsert the RAM chips to make sure they’re seated properly. If you still have problems, remove the RAM chips temporarily and see whether the problem still exists.Follow the installation instructions that came with the RAM chips — or the ones in the booklet that came with your Mac. But even if they don’t say to get rid of the static spark, you should (by using an antistatic strap available from most RAM sellers or by touching an appropriate surface, such as the power-supply case inside your Mac) before you handle RAM chips.
Erasing your disk: For most reasons to erase, including when reformatting a disk or selling, giving away, or trading in your Mac, you should erase your entire disk.
Erasing a volume on your disk: In other cases, such as when your disk contains multiple volumes (or partitions) and you don't want to erase them all, you can erase specific volumes on the disk.
Erasing a disk or volume permanently deletes all of its files. Before continuing, make sure that you have a backup of any files that you want to keep.
How to erase your disk
- Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the disk your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. - Choose View > Show All Devices from the menu bar in Disk Utility. The sidebar now shows your disks (devices) and any containers and volumes within them. The disk your Mac started up from is at the top of the list. In this example, Apple SSD is the startup disk:
- Select the disk that you want to erase. Don't see your disk?
- Click Erase, then complete these items:
- Name: Type the name that you want the disk to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- Scheme: Choose GUID Partition Map.
- Click Erase to begin erasing your disk and every container and volume within it. You might be asked to enter your Apple ID. Forgot your Apple ID?
- When done, quit Disk Utility.
- If you want your Mac to be able to start up from the disk you erased, reinstall macOS on the disk.
How to erase a volume on your disk
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- Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the volume your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. - In the sidebar of Disk Utility, select the volume that you want to erase. The volume your Mac started up from is named Macintosh HD, unless you changed its name. Don't see your volume?
- Click Erase, then complete these items:
- Name: Type the name that you want the volume to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- If you see an Erase Volume Group button, the volume you selected is part of a volume group. In that case, you should erase the volume group. Otherwise, click Erase to erase just the selected volume. You might be asked to enter your Apple ID. Forgot your Apple ID?
- When done, quit Disk Utility.
- If you want your Mac to be able to start up from the volume you erased, reinstall macOS on that volume.
Reasons to erase
You can erase at any time, including in circumstances such as these:
- You want to permanently erase all content from your Mac and restore it to factory settings. This is one of the final steps before selling, giving away, or trading in your Mac.
- You're changing the format of a disk, such as from a PC format (FAT, ExFAT, or NTFS) to a Mac format (APFS or Mac OS Extended).
- You received a message that your disk isn't readable by this computer.
- You're trying to resolve a disk issue that Disk Utility can't repair.
- The macOS installer doesn't see your disk or can't install on it. For example, the installer might say that your disk isn't formatted correctly, isn't using a GUID partition scheme, contains a newer version of the operating system, or can't be used to start up your computer.
- The macOS installer says that you may not install to this volume because it is part of an Apple RAID.
About APFS and Mac OS Extended
Disk Utility in macOS High Sierra or later can erase using either the newer APFS (Apple File System) format or the older Mac OS Extended format, and it automatically chooses a compatible format for you.
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How to choose between APFS and Mac OS Extended
Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If it can't, it chooses Mac OS Extended, which works with all versions of macOS. If you want to change the format, answer these questions:
- Are you formatting the disk that came built into your Mac?
If the built-in disk came APFS-formatted, Disk Utility suggests APFS. Don't change it to Mac OS Extended. - Are you about to install macOS High Sierra or later for the first time on the disk?
If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled). During installation, the macOS installer decides whether to automatically convert to APFS—without erasing your files. - Are you preparing a Time Machine backup disk or bootable installer?
Choose Mac OS Extended (Journaled) for any disk that you plan to use as a Time Machine backup disk or as a bootable installer. - Will you be using the disk with another Mac?
If the other Mac isn't using macOS High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't work with APFS-formatted volumes.
How to identify the format currently in use
If you want to know which format is currently in use, use any of these methods:
- Select the volume in the Disk Utility sidebar, then check the information shown on the right. For more detail, choose File > Get Info from the Disk Utility menu bar.
- Open System Information and select Storage in the sidebar. The File System column on the right shows the format of each volume.
- Select the volume in the Finder, then choose File > Get Info from the menu bar. The Get Info window shows the Format of that volume.
If your disk or volume doesn't appear, or the erase fails
- Shut down your Mac, then unplug all nonessential devices from your Mac.
- If you're erasing an external drive, make sure that it's connected directly to your Mac using a cable that you know is good. Then turn the drive off and back on.
- If your disk or volume still doesn't appear in Disk Utility, or Disk Utility reports that the erase process failed, your disk or Mac might need service. If you need help, please contact Apple Support.
Learn more
- If you can't start up from macOS Recovery, you can use a different startup disk instead.
- If Disk Utility shows a Security Options button in the Erase window, you can click that button to choose between a faster (but less secure) erase and a slower (but more secure) erase. Some older versions of Disk Utility offer the option to zero all data instead. These secure-erase options aren't offered or needed for solid-state drives (SSDs) and flash storage.