![]() ![]() The mapout table file is now the authority, and it's full of junk). "Clear Free Space" not only writes clean tracks/sectors, but also tests and maps out bad clusters (that's why the drive becomes unusable if the routine FAILS before completion. This task is the only way to make sure that the newly manufactured drive is cleanly formatted and that all the media actually works (hard errors are trapped out by "Clear Free Space"). One only does this on a clean drive, newly formatted, and only on a drive you have recently bought new. Firstly, it is NEVER a good idea to "clear free space" on a drive with an existing system (anybody that says otherwise, is opening your system for obscure system or media errors that cannot be easily solved, better to stay away from it altogether, except to setup a new drive). Now let's see if we can fix this without getting really depressing !ġ). If your problem is hardware related, you are toast. Sometimes it is bad media on the Boot-drive, sometimes it is bad software in the OSX, and sometimes it is hardware related. ![]() I am presently the only Macintosh Technician in my town, and I've seen your kind of problem before. I've been doing computing since 1971, and my first decent personal computing ownership experience started with Microware OS9 (a UNIX clone) on a Radio Shack Color Computer 3. You might know about other methods but what I think this methodology is new for you, so, give it a try and I am sure you will feel at home.Signed in specifically to reply to your problem, Psykamaholik. This is the method or application where you can easily create any MacOS Bootable USB. Now open R-Drive Image app from desktop and follow the below steps to create MacOS High Sierra Bootable USB. To format the USB drive drive, click the Apply button in the lower right. Bear in mind that this will erase all data from the USB drive, so backup any important files before proceeding. Click the Partition tab Under the Partition Layout header click on the 1 Partition option in the drop-down menu Click the Format drop-down menu and select Mac OS Extended (Journaled). This can take fairly long, depending on the speed of your external drive and its connection to your Mac, so it’s best to have a fast hard drive with Thunderbolt, USB-C, or USB. Click “Restore,” and Disk Utility will start the copying process. ![]() You can also choose an ISO image, but that doesn’t have much use here. ![]() Your Mac will start up to macOS Recovery. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. After creating the bootable installer, follow these steps to use it: Plug the bootable installer into a compatible Mac. ![]()
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