Decrypt Mac Osx Disk For Upgrade To High Sierra

Sadly, there is no simple solution to install macOS High Sierra on RAID systems When I went to upgrade my the other night, I made a very unpleasant discovery. I have multiple 1TB SSD drives in my old iMac, three in fact, two of which are combined together in a RAID set and act as one single drive. This gives me the benefit of a roomy 2TB boot drive that performs at about twice the speed of a single SSD.

It makes my old iMac perform even better than most newer models. But High Sierra won’t let me upgrade it. Whaddya mean I can’t select it? I’ve got 2TB of super-fast storage right there, currently housing my macOS Sierra installation, and it might as well be in another time zone.

Upgrade Mac OS: How to Upgrade to macOS High Sierra. By Carrie Murray, Thursday, January 18. Therefore, before installing macOS High Sierra on your Mac, check your Mac storage before the upgrade. You need 2GB RAM to run High Sierra, which won't be a problem since all supported Mac models have at least 4GB RAM.

The High Sierra installer has my boot drive greyed out. When I mouse over it, the tooltip reads that it can’t use that drive because it’s an AppleRAID set.

I reached out to Apple and didn’t hear back, so I went next to the. Their take on macOS High Sierra was that “some developers have gotten word that Apple prevented High Sierra from being installed on a RAID set” but that “installing on a RAID set is only an issue during the install.” So the good news is that, if you have a RAID system, your data isn’t lost. Once you have High Sierra installed, you’ll be able to access your RAID set again. The problem, then, is how to get the latest version of macOS installed in the first place. Click Continue to find out how I got around the issue. So near and yet so very far The Good If you’re lucky enough to have additional storage installed on your iMac, you can load High Sierra on that drive.

The installer needs 5GB of space, so plan accordingly. You can even use an external drive, but make it a fast one, because it’s going to be your new boot drive (alternately, if you have a really big extra drive, you can clone your data to that drive, install High Sierra on that, then clone everything back to your RAID set). Unless you have enough room to transfer your entire system, resist the temptation to pull over tons of files when the “Transfer Data to your Mac” assistant pops up during installation. Otherwise, you’re in for a long night. Remember, once you install High Sierra on the target drive, you’ll be able to access your files in the RAID set again.

The good news is that if you install High Sierra on a SSD, it will automatically be converted to APFS, Apple’s new, speedy, file system. The Bad In case you’re like me, though, and ignore that advice, you’re going to end up with a nasty surprise when High Sierra (finally) completes transferring data hours later. You’ll have a (mostly) cloned system with duplicates of all of your data.

I went from having a completely empty spare drive to having barely any space at all left on my iMac. The Ugly The only thing to do once that happens is to dig through and manually delete files. Your personal libraries are going to be the biggest (Movies, iTunes, and Photos). Unless you have already started saving new data to the drive with High Sierra, you can go ahead and delete them from your new boot drive. Excel for mac watermark. Just make sure that, when you open the programs, you hold down the Option key and select the location of the original library. Otherwise, High Sierra will create a new, empty one for you.