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Question: APFS questions

My sister just bought a 2013 refurbished 15" MacBook Pro (don't know if it is an Early or Late 2013). I don't know which Mac OS is installed but if she wants Mac OS High Sierra, will it convert the internal storage to APFS during the installation process? I'll be going down to her house either at the end of this week or on Thanksgiving to help her with files migration and setting up her email.


What will happen during the migration from her old 2009 MBP with HFS+ format internal storage, will her files be corrupted since they are currently saved to a non-APFS drive?


Will we have to convert all her external storage to APFS if the new MBP has High Sierra installed?

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Nov 13, 2017 4:15 PM in response to romad In response to romad

If the internal storage is an SSD then High Sierra will convert the disk to APFS by default, but as the user, you can opt out of the conversion. But you must be aware of what's going on or you may miss the alert panel. I recommend opting out of APFS at this time until it is finished and more polished than it is now.

Nov 13, 2017 4:15 PM

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Nov 13, 2017 6:07 PM in response to romad In response to romad

Thank you for all the replies, everyone. The main reason I'm concerned about file corruption is because the MBP will replace the one used in their part-time wine business. I may try installing High Sierra on my 2011 MacBook Air so I can see what happens when.

Nov 13, 2017 6:07 PM

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Nov 13, 2017 6:19 PM in response to romad In response to romad

There is no reason not to allow High Sierra to format your internal ssd to APFS. This formatting does not affect files. If this is a business computer or if it contains important information make sure, as always recommended, to have a current backup prior to upgrading.

Nov 13, 2017 6:19 PM

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Nov 13, 2017 6:20 PM in response to gamegambier101 In response to gamegambier101

gamegambier101 wrote:


You won't see any difference though all your old file would be converted to apfs format so if you have a lot of file than installing would take forever so there would be almost nothing that would change.

Files are not changed. Converting a drive to APFS has no affect on files.

Nov 13, 2017 6:20 PM

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Question: APFS questions