If you need a storage solution to handle your backups, Other World Computing has a large selection of storage options you can choose from. If it does get your Mac going again, remember to back up your Mac before you go any further. If you’ve run into an issue and you didn’t first perform a backup, then with any luck, one of our tips will get you back on track. The most important of these is to back up your Mac before you start the installation process so that you can recover from any installation issues that may arise. You should also take basic steps to ensure you can recover from any install issues you may come across. Even so, it’s a good idea to review our Rocket Yard guides for a clean install of macOS Catalina as well as an upgrade install of Catalina. I boot a working guest and mount the same XYZ.iso in the CD drive while the guest is running, and this happens: scottgus1 Site Moderator Posts: 17862 Joined: 30.Installing a new version of the Mac OS is generally a fairly pain-free process this trend continues with macOS Catalina. I put the same XYZ.iso in a working guest's CD drive in Virtualbox's settings window while the guest is shut down, then I boot the guest, and this happens: I put XYZ.iso in a new guest's CD drive in Virtualbox's settings window, then I boot the guest, and this happens: Try to start a guest with the new ISO (I find that booting with a non-bootable ISO merely gives the No Bootable Medium error, Virtualbox seems to attempt to use the ISO.) If the guest at least gets to the No Bootable Medium error, than your Virtualbox should be able to boot from ISOs and your other ISO's may be bad.Īlso, on one of your non-working XYZ.iso's give some data like this. Becca: It is possible that a file that did work once can get corrupted later.įor the green guys: Is the Boot-from-ISO requirements in Virtualbox different from the Mount-in-a-guest requirements? if not, then a guest which can accept and mount an ISO ought to be able to boot from it.īack to Becca: As a test, try downloading some ISO or other from a worthy site, especially if you can get a md5 or SHA hash on the site, too, then run a hash on your download to confirm.
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