(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. I have a imac from mid 2011 with 8 GB Memory & 3 TB Hard Drive running Mac OS X 10.10.5. Since yesterday my mac will boot and then shut down. So I went to Mac OS utilities and went to disk and accidentally deleted my 3TB hard drive. Then I wanted to get a fresh copy of Yosemite and it is asking me to choose a disk, there is no disk to choose. If you want to erase a hard drive in OS X 10.9 Mavericks, just choose the option – 'Erase Hard Drive'. Then select the hard drive and click on 'Erase' button. Once the erasing process gets finished, all the data on the selected hard drive will be permanently erased. No data recovery software can recover lost data from the erased hard drive.
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 will be at the top of the list. In this example, Apple SSD is the startup disk:
Select the disk that you want to erase. Can't see your disk?
Click Erase, then complete these items:
Name: Type the name you want the disk to have after you have erased it.
Format: Choose APFS or Mac OS Extended (Journalled). Disk Utility shows a compatible format by default.
Scheme: Choose GUID Partition Map.
Click Erase to start erasing your disk, and every container and volume within it. You may be asked to enter your Apple ID. Forgotten your Apple ID?
When it's finished, 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
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 will be called Macintosh HD, unless you have changed its name. Can't see your volume?
Click Erase, then complete these items:
Name: Type the name you want the volume to have after you have erased it.
Format: Choose APFS or Mac OS Extended (Journalled). Disk Utility shows a compatible format by default.
If you see an Erase Volume Group button, the volume you have 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 may be asked to enter your Apple ID. Forgotten your Apple ID?
When it's finished, quit Disk Utility.
If you want your Mac to be able to start up from the volume you erased, reinstall macOS on that volume.
You want to permanently erase all the 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’ve 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
Best portable storage for macbook pro. 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.
How to choose between APFS and Mac OS Extended
Macbook equivalent of word. 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 (Journalled) 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 (Journalled). Earlier versions of macOS won't work with APFS-formatted volumes.
How to identify the format currently being used
If you want to know which format is currently in use, use any of these methods:
Hard Drives For Macbook Pro
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 process fails
Shut down your Mac, then unplug all non-essential devices from your Mac.
If you're erasing an external drive, make sure it's connected directly to your Mac using a cable that you know is in good working order. 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 may need a 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.
I’ve had a mid-2012 Macbook Air 13' (A1466) since 2013, and it’s finally giving way. Here’s what’s happening to it: Best backup for macbook air.
It's slow. It's very slow. It stops 3/4ths of the way in the loading screen, it takes 30 mins to boot up, and even after it's booted up, applications take ages to load and the cursor lags hard. Typing takes a while too. More than half of its RAM is empty, trash is empty. Did Apple diagnostics and EFI/Drivers/TestSupport.efi can't be loaded. So I'm guessing it's a Hard drive failure.
The battery appears as an 'X' and won't last a second without a charger plugged into it.
I'd like some following advice on the questions below:
From what brands should I purchase the batteries and harddrives from? I really don't want any leaks or components that don't last long.
In terms of harddrive, I'm thinking of getting a 250 GB SSD and a SATA cable, am I on the right track?
Thank you very much. Any help would be very much appreciated.
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