Freeware version installation package (dmg) includes executable, being able to run on iMac, MacBook. Active KillDisk for Mac is an easy-to use & compact freeware utility that allows to sanitize attached media storage with the 24 international data sanitizing standards.It permanently erases all data on Hard Disks, Solid State Drives, Memory Cards & USB drives, SCSI storage & RAID disk arrays. One useful feature of Disk Utility is its ability to create a disk image from the contents of. Quickly create disk images from folders. It’s clean because it isn’t simply installed on top of your existing files, and it’s a re-install because those system files are there already.defaults delete com.apple.DiskUtility advanced-image-options.You boot into Recovery Mode, use Disk Utility there to wipe your boot volume, then re-install macOS from the main window. This program is designed to write a raw disk image to.In Mojave and earlier, a clean re-install is straightforward if time-consuming. A Windows tool for writing images to USB sticks or SD/CF cards.
![]() Disk Utility : Erase With Images Install Because ThoseMy drive was formatted as Mac OS Extended, and it had become corrupted. A disk image can be used to store and encrypt files.The Erase button will also be greyed out if the drive was formatted with a format no longer supported by disk Utility. However, Disk Utility can not only manage your hard drives and other forms of storage, it can also create disk images. Psle science notes pdfHowever, as of 10.15.2 that doesn’t work, and results in the creation of yet another Data volume named Macintosh HD – Data – Data.Deleting the Data volume does make a difference to the end result: when you delete the Data volume then add it back, its Unix-style volume number has changed, perhaps from 2 to 1, and that of the System volume goes from 1 to 5. If that happens, restart into Recovery mode and repeat the process of erasing the System volume, which should succeed on the second try.If you’re performing this clean re-install to try to fix a problem, and don’t want to make its current data particularly inaccessible, then all you should need to do is select the Data volume and erase it when you re-install macOS that should overwrite everything on the System volume, which is, after all, read-only in normal use. This is described by Apple in this detailed support note, but commonly fails with an error reporting that ‘The volume “Macintosh HD” on disk2s5 couldn’t be unmounted because it is in use by the process 734 (kextcache)’. Sadly, that’s wrong and will fail.To perform a clean re-install in Catalina, once in Recovery Mode, you need to delete your Data volume, that’s the one named Macintosh HD - Data, or something similar if you’re using a custom name, and to erase your System volume.In Recovery Mode select the Macintosh HD - Data volume at the left of Disk Utility’s window then use the Delete APFS Volume command from the Edit menu, or use the shortcut by clicking the – tool.Once that’s deleted, you’ll then need to erase the System volume, by selecting it at the left and clicking on the Erase tool. Because you want to re-install macOS, the logical thing to do would be to wipe the System volume, which suggests that you could get away with retaining your own files on the Data volume through a clean re-install. The first of those is the read-only System volume, and the second the read-write Data volume. Delete all the Data volumes and erase (not delete) the System volume, then re-install. Once macOS has completed the installation, it’s worth opening Disk Utility to check that you have the System and Data volumes you expect, and no more.If you have too many Data volumes, it’s best restarting back in Recovery Mode, opening Disk Utility there, and going back through the process of deleting and erasing volumes again. If you try to install macOS onto the original System volume, Macintosh HD, you’ll discover that’s not possible, so select the Data volume here, Macintosh HD - Data instead.The commonest and most peculiar problems arise when the installer gets overenthusiastic about creating new Data volumes, and you end up with additional volumes with names like Macintosh HD - Data - Data. Whichever type of re-installation you have set now requires that version of macOS to be downloaded afresh.Depending on which version of Catalina it’s running and how you erased volumes using Disk Utility, you may be presented with a choice of volumes on which to install macOS, which could be a surprise. At one time, the Recovery volume contained sufficient to restore the current version of macOS if you have entered ‘local’ Recovery Mode using Command-R, but this doesn’t seem to work any more. Rules of survival for mac without emulatorThe ‘clean’ part is preparation performed by the user, not any different behaviour on the part of the installer. It doesn’t, as far as I can see, break the old Volume Group, nor start creating new volumes, either System or Data, nor should it.A clean re-install should behave exactly the same, and respect any System and Data volumes where they already exist. I think what you have seen is a bug, or at least an inconsistency which Apple needs to iron out.When you perform a regular re-install of Catalina, the installer should take the existing System and Data volumes and install a new copy of Catalina onto them. This is then the squeakiest clean of clean re-installs, but should very seldom be necessary.Thanks to Vladislav for information about the difference between volume numbering according to the procedure used.Updated 21 December 2019 with corrections from field testing.Thank you. The reason that this is now unpopular is that, if your Mac has a T2 chip, you can’t boot it from an external disk without entering Recovery Mode first to enable that, rather then running in the default Secure Boot mode.Once booted from that external disk, you can then use Disk Utility to erase the whole internal storage back to a GUID Partition Map, then run the macOS installer of your choice to install macOS onto it, during which it will create the various volumes it requires. Exiting the install process at the start of its customisation steps doesn’t leave your Mac in a position to be able to mount as a Target Disk, for example.To take your internal storage right back to the beginning and set it up from scratch, you should be able to do this when booted into either of the ‘remote’ Recovery Modes, but it’s most reliably done when booted from an external disk. ![]() You could go back to using High Sierra, but you’d first have to back everything up and then reformat the startup disk in HFS (Mac OS Extended journaled) format, and then re-install High Sierra on it. If even opening a folder in Finder has become noticably slower, that’s very likely the reason for it.1. If you are still using hard disks instead of SSDs, then APFS has made them slower, by at least a factor of 2. The reason for it to have become slower is that the upgrade converted your disks from HFS to APFS format. There are also people who do this for you, look for local services.Thank you a lot for this post. First, connect the SSD with an extra purchased external 2.5″ disk enclosure to your Mac, then use a copy program like CCC or SuperDuper to copy everything from your Mac’s disk to the external, SSD, then remove the HD from your Mac and replace it with your SSD. Exchange your Mac’s HD with an SSD. This carried a little problem with it from the old computer, so I thought I’d clean re-install Catalina and then use the TimeMachine backup instead, and as soon as I got the adapters USB-A to USB-C I did it… And now I have the dreadful “Macintosh HD – Data – Data” thing.AND, as I didn’t notice it right away, I also had the computer perform a few TimeMachine backups since, so I believe I shouldn’t use it anymore……So I airdropped all the new files I created in the meanwhile to the old computer, and want to clean install again and solve this “data-data” problem. □I bought a MacBook Pro 16 and made the “migration” from my old MacBook Pro importing straight from the computer.
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