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. CoreStorage – if an SSD is part of a CoreStorage ‘fusion’ drive, even if the other drives are also SSDs, then it will be left in HFS+ and cannot be formatted as APFS. When High Sierra is installed on them from High Sierra, though, it will install onto APFS if so formatted, but does not automatically convert. External – not converted when High Sierra is installed on them from Sierra, no option, and installer will not install from Sierra onto APFS, only HFS+ Journaled. Can be converted from HFS+ Journaled to APFS, and formatted as APFS, using Disk Utility in High Sierra. 
Left unconverted if High Sierra installed on external drive. Internal – converted to APFS when High Sierra is installed on them, no option.Here’s a brief guide to the different file systems supported by the first release of High Sierra 10.13 on different types of disk.
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