In this example, the startup disk (APPLE HDD) has one container and two volumes (Macintosh HD, Macintosh HD - Data). BUT when I try to make it the default startup disk in system preferences it does not appear in the menu for selection. Reformat Mac Startup Disk. How to change your default startup disk. This will list all available drives and tell you if they can be initialized or not. Select the virtual disk in Disk Utility left panel, then click Erase button at top bar, it will popup a window. Connect your hard drive and follow these instructions: Go to System Preferences > Disk Utility. Select your startup disk, then restart your Mac. Restart your Mac and reconnect hard drive to Mac. Here is the deal, before you can install and use your new solid-state drive (SSD) on your Mac computer, you have to reformat your Mac Startup disk. If you do not have time to manually clean up your startup disk, we recommend using MacCleaner Pro to both analyze disk space usage and free up disk space. Click Repair. Hopefully your USB should be listed as one of the bootable disks in the Startup Manager. Screen shot … 'About this mac' shows it in 'Storage' and it's there in Disk Utility ... but nothing in System Preferences > Startup Disk. Most people do not know, actually, that their Mac is converting a free startup disk space into virtual memory, which you use for daily operations. Sometimes Mac won't boot from USB as expected. This is another important solution to fixing the Macbook profile with a question mark. If the drive greyed Out? If you see a message that your security settings do not allow this Mac to use an external startup disk, check the External Boot setting in Startup Security Utility. Shut down your Mac and then unplug the power cord and all USB connections. Let’s take a look at some of the causes of a flash drive not showing up on a Mac to determine if you can resolve your particular issue. 4. Apr 06, 2020 Choose Apple menu System Preferences, then click Startup Disk. – Steve Chambers Jul 31 '15 at 13:50 hello, probably the operating system has lost the boot files, should not be physically dead. Your disk might not have a container, and it might have a different number of volumes. macOS startup disk is now showing on "windows 10 bootcamp Control Panel " on the iMac but not on MBP. At "this" point, insert the Bootable USB Disk you created and press and hold the option key. choose Disk Utility from the Utilities window, or from the Installer menu if you're started from an installation disc. Note: this doesn’t apply if Windows disappears from the Startup Disk selector, but still shows up when holding Option on boot. As soon as you have created a backup, restart your Mac and check if it has freed up the disk space. If your Mac is not recognizing a USB or external hard drive after this, you’ll have to try mounting it manually. Hopefully, the hard drive has shown up now. Now press Startup (or “Set as Startup” in NTFS for Mac 14) button. I have applied this update on iMac and MBP. When the Mac startup disk achieves its absolute performance, this means 2 things, precisely speaking 2 consequences: Your Mac’s storage space will get to its limit very soon. Mount an external hard drive on Mac. Click the lock and enter your administrator password. For those cases, see this article: “After installing NTFS for Mac, NTFS partitions don’t show up in Startup Disk menu” . Attempting to do so will cause your Mac to display a message that your security settings do not allow this Mac to use an external startup disk. To tell your Mac to automatically use a specific startup volume each time your restart or turn it on, open the System Preferences application in the Dock and click the Startup Disk pane. Tip: You can also attach external hard drives with an operating system: Startup Manager will automatically add bootable volumes as you connect them. 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