FORMAT HARD DRIVE FOR MAC OS HIGH SIERRA MAC
Reboot into Safe Mode – To do so, restart the Mac and hold the Shift key while restarting.Before proceeding, make sure to backup all your important data or better perform a Time Machine backup. Regardless of the reason, it’s literally very easy to overcome this ‘error verifying firmware’ issue and normally proceed with the High Sierra installation on a compatible Mac. This error could arise if you’re using a third-party SSD on your Mac and in our case, it’s a Samsung Evo 250GB SSD. If you have any different experiences, please let us know in a comment.Don’t worry, you aren’t alone as several users including me encountered the exact same issue. Other possibilities may be available using command tools. Note that APFS encrypted volumes are completely unusable in Sierra 10.12.6 unencrypted volumes work much of the time, with only occasional errors and problems. Using the case-sensitive version is likely to cause many issues. Unless you know exactly what you are doing, you should only use the APFS or APFS (Encrypted) options.
You can then add additional volumes, if required, by selecting the drive at the left and using the Volume tool above the list of drives. If you experience difficulty getting Disk Utility (High Sierra) to format a disk in APFS, select the drive at the left, then click on the Partition tool above, and select the APFS option if offered. Avoid if possible, using HFS+ or iCloud Drive as an intermediate store. under Sierra – unsupported and prone to error and problems.
under High Sierra – fully supported and appears reliable.Problems were experienced during beta testing, so do not try. Home-brew ‘fusion drives’ could be defused into separate SSD and hard disks, then the SSD formatted in APFS, if you wish.Ĭannot currently be converted to APFS.Cannot currently be converted to APFS.Behaviour appears inconsistent, and can also result in errors when formatting or in use.įusion Drives (combined SSD and hard disk, united in CoreStorage): Others can be, at least in Disk Utility, but this must be performed using the Partition tool, not Erase. Disk Utility (High Sierra) either does not offer the option, or returns an error when attempted.
Some cannot be converted to, or formatted in, APFS. If you want to convert it to APFS, you must defuse it by uninstalling CoreStorage and turning the SSDs back into separate drives again.
FORMAT HARD DRIVE FOR MAC OS HIGH SIERRA INSTALL
When High Sierra is installed on them from High Sierra, though, it will install onto APFS if so formatted, but does not automatically convert.
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