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MAC DISC DRIVE SET UP MAC OS
MAC DISC DRIVE SET UP SERIAL NUMBER

You can format these devices as APFS and try to make a bootable backup, but if the performance of the device is too slow to be practical, then we recommend you choose Mac OS Extended (Journaled) for the format. "Slim" backup devices, 2.5" disks) APFS is not designed for these devices, macOS boot performance may be poor. If your destination device is an HDD with a rotational speed of 5400RPM (or slower): (e.g. Choosing a Format for your destination volume If you do not see the Scheme option, go back two steps and select the whole disk device, not one of the volumes on the disk. You can set the name to whatever you like, but set the Scheme to GUID Partition Map. Erase the specified diskĬlick on the Erase button in Disk Utility's toolbar, then configure the name, format, and partitioning scheme of your disk. Click the Eject button next to any volumes on the disk to preemptively unmount them before erasing the disk. because Spotlight prevents the unmount request). Unmount any volumes on the specified diskĭisk Utility occasionally has problems with unmounting a volume while attempting to erase it (e.g. If your disk is a Fusion device, you may erase the "container" within it instead. You must select the whole disk to correctly initialize the device. Please pay particular attention to selecting the disk, not one of the volumes on the disk.

MAC DISC DRIVE SET UP SERIAL NUMBER

A startup disk will often include the manufacturer's serial number in the title (e.g. The name of a new disk will often include the manufacturer’s name (e.g. This disk should not be the same as your startup disk. Before doing anything else in Disk Utility, choose Show All Devices from the View menu, or from the View popup button in Disk Utility's toolbar.Ĭlick to select the disk that you would like to use as the destination for your CCC task. Unfortunately, this hides the devices that you need to select to modify the partitioning of your backup disk. Watch a longer, in-depth tutorial about using Disk Utility Show All Devicesĭisk Utility offers a very simplified view of your devices by default.

Watch a video of this tutorial on YouTube Instructions for Big Sur, Catalina, Mojave, and High Sierra

macOS 10.12 Sierra and OS X 10.11 El Capitan.

macOS 11Big Sur, 10.15 Catalina, 10.14 Mojave, and 10.13 High Sierra.

Choose About This Mac from the Apple menu to determine your current OS, then make a selection below. Neither one had any issues.The remaining steps vary considerably depending on the operating system you are running. So I quit Startup Disk and went back to Disk Utility, and I tried running First Aid on both Macintosh HD and OS X Base System. Startup Disk could not gather enough information on the selected disk. You can’t change the startup disk to the selected disk. Clicking restart, as one might expect, yields the following error message: So I thought I’d try quitting OS X Utilities without reinstalling OS X and see what happens.Īfter clicking on Choose Startup Disk, I get a blank list to choose from, with a restart button. But when I hit continue, it gives me an error message:Īn error occurred while preparing the installation. I restarted with cmd R to load OSX Utilities, and I used Disk Utility to wipe Macintosh HD, overwriting it three times and formatted as OS X Extended (Journaled).Īfterwards, after successfully connecting to my Wi-Fi, I clicked on Reinstall OS X, and it’s giving me the option to set up El Capitan (the OS X that’s installed, and from what I can tell, the latest that can be installed). I’m helping someone with their old laptop (17”, mid-2009, if that matters).