Insert the first system installation disk or the system installation CD in the appropriate drive, then restart your computer. Consciously and selectively backup files to external disk or cloud storage Format the startup disk and install latest macOS with pre-installed USB Migrate.For a drive that has previously been encrypted, it is not necessary to overwriteMac OS 9.1 and 9.2 update to 9.2.1 (This update is only available for computers that can run Mac OS X.) Clean install for Mac OS 7.5.x. Use either the keyboards arrow keys or the mouse to select 'Install MacOS High Sierra.' Press enter or click your selection with the. When you see the boot selection screen as shown, release the option key. Hold down the option or alt () key on the keyboard and power on the device. Plug in your macOS High Sierra bootable flash drive.
Clean Free Space OnDelete megatons of junk, malware, and make your Mac faster & more organized. This guide can be followed if you are upgrading from macOS Catalina, or you are finding that macOS Big Sur is giving you tons of issues such as slowdowns, app. The free space on the disk as any data written there will have been encryptedClean install macOS Big Sur on a Mac.Modern devices have wear-leveling, block-sparing, and possibly-persistent cache hardware, which cannot be completely erased by these commands. Format the drive as usual using Disk Utility (APFS (Encrypted) ifThe diskutil man page offers this warning on the use of diskutil secureErase:NOTE: This kind of secure erase is no longer considered safe. See the diskutil man page (not available in Recovery mode)For more options, but all other options take an inordinate amount of time for Level 0 = overwrite with 0s, which takes around two hours for a 1TB SSD on a2012 MacBook Air. To erase free space enter diskutil secureErase freespace 0 volumemountpoint, where volumemountpoint is the mount point noted above,E.g.: diskutil secureErase freespace 0 /Volumes/Ardbeg. Use diskutil list to list available volumes, and note the mount point of Select appropriate install destination, then enter the drive encryptionPassword you used when formatting the drive. In general, just follow the prompts, making selections asAppropriate, taking note of the following: (ThisNote also confirms our suspicion that APFS encryption = FileVault.)Now you’re ready to actually install macOS, so boot from the USB installer (holdDown Alt during startup to select the boot drive), select Install macOS andFollow the prompts. So, all told, maybe you need to do aSecure erase one last time, but you shouldn’t need to do it ever again. Consider using APFS encryption (FileVault).This is good advice, but it fails to address the situation where you have a diskWith unencrypted data on it, that you now want to re-use and need to securelyWipe first (for reasons as outlined above). Strongly-encrypted data can be instantly "erased" by destroying (or losing) the key (password), because this renders your data irretrievable in practical terms.Select light or dark mode (Mojave or later).This completes initial installatin–you should now be logged in.On earlier versions, downloading the installer from theApp store might download the full installer, or it might just download a ~20MBBootstrap installer. Analytics: disable share with Apple and Developers for a hardened machine. You may want to disable Enable Location Services for a hardened machine. In Expess Set Up, accept the defaults unless you want to customise settings: If you are given the option to allow Apple ID to resetYour password, you can leave it enabled 6.Re-enter encrypted boot volume password (probably for the last time). Leave the Allow this account to unlock theDisk option enabled–this will mean that entering your account password atLogin decrypts the disk, instead of having to enter the disk encryptionPassword every time. Filezilla for mac infection↩This option should not appear if you skipped signing in with anApple ID earlier, but if you did sign in, it is useful to leave it enabled(unless you want to set up a hardeded machine–this setting means that, if yourICloud account is compromised, your computer is at risk (assuming an attackerWith physical access to your computer)). Also, as suggested in that post, I left the volume name as‘Untitled’ for the duration of the installation process. Eventually, following the instrctionsTo completely delete the logical volume group that defines the fusion driveAnd recreate it. ↩At this point, when re-installing High Sierra on a2011 iMac with Fusion drive, I got a “Mac OS could not be installed on yourComputer” error.
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