It may seem odd but the usual cause is a corrupt installer, and simply deleting the installer app and downloading a new copy will likely fix the issue.
This message usually shows up as a sheet that drops down from the macOS or OS X installer shortly after you start the install process. With the backup recommendation out of the way, let’s get started with the error messages.Ĭould Not Write Installation Information to Disk
You can find a large number of external enclosures, drives, and SSDs, as well as a portable and easily-carried-with-you Envoy Pro EX high-performance USB 3 or Thunderbolt bus-powered SSD storage. If you don’t have a backup system in place, I highly recommend investing in one before you install a new version of macOS. Having a Time Machine backup or a clone of your current system can be a lifesaver. Some of the installation issues we’re going to mention can cause loss of data. Installation Issues Commonly Seen with macOSīefore we get too far along, I want to point out the obvious: don’t install a new version of the Mac operating system without having a current backup. With any luck, you may be able to either correct the issue, allowing you to finish the installation, or prevent the problem from occurring in the first place. The erased volume is written seven times to ensure the data can't be restored.In this guide, we will look at some of the installation problems that tend to occur with new releases of the Mac operating system. Department of Defense (DOD) 5220-22M standard for securely erasing magnetic media. Most Secure: This method of securely erasing a volume or disk meets the requirements of the U.S.It writes two passes of random data to the volume or disk and then writes a single pass of a known data pattern to the volume or disk. Three-Pass: This is a DOE-compliant three-pass secure erase.Advanced recovery techniques could restore the data, but it would require a great deal of time and effort. Zero Out the Data: This erase method writes a single path of zeros to all locations on the selected volume or disk.It doesn't scramble the file data, which means a recovery app may be able to resurrect the erased data. Fastest: This is the quickest erase method.The drop-down Secure Erase Options menu presents options similar to the ones in earlier versions of the operating system, but it uses a slider for making choices instead of an options list. Options for OS X Lion Through OS X Yosemite Don't expect this erase method to finish any time soon. It writes over the data on a volume 35 times. 35-Pass Erase: This is the highest level of data erase security that Disk Utility supports.
Department of Defense's 5220-22M standards for erasing magnetic media. 7-Pass Erase: This method meets the security requirements of the U.S.
The length of time this method takes depends on the size of the volume. It erases the volume's data by writing over it with zeros. Zero Out Data: This method provides a good level of security.It removes the volume's catalog directory but leaves the actual data intact. Don’t Erase Data: This method is quick but not secure.Options for OS X Snow Leopard and Earlier