https://github.com/alistairmcmillan/testiosapfscheck

Trying to programmatically detect if filesystem is APFS
https://github.com/alistairmcmillan/testiosapfscheck

Last synced: 27 days ago
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Trying to programmatically detect if filesystem is APFS

• Host: GitHub
• URL: https://github.com/alistairmcmillan/testiosapfscheck
• Owner: alistairmcmillan
• Created: 2017-03-26T06:47:01.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2017-03-26T10:36:30.000Z (almost 8 years ago)
• Last Synced: 2024-11-06T05:04:39.405Z (3 months ago)
• Language: Objective-C
• Size: 1.04 MB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
##What is this##

An experiment, trying to programmatically detect if filesystem is APFS when running on iOS.

Based on https://twitter.com/catnapgames/status/833745955589611520

##How to detect APFS on iOS##

- First try: write new file, check difference in free disk space. This tells us the block size. Not sure if useful, but currently getting 8192 on iOS simulator on HFS+ and 4096 on iPhone 5 running 10.3 beta 3. **Turns out this is not significant**

- Second try: file timestamp resolution. Create a series of files, check if timestamps differ by seconds or milliseconds. **Seems like I'm getting sub-second resolution on some devices.**

##Results##

So the 2nd attempt seems to have some results. I got sub-second timestamp diff on an iPad Pro running 10.3 beta. iPad Air 2 running iOS 9 gets 1-second resolution. iPhone 5 running iOS 10.3 beta gets 1-second resolution as well - maybe the rumors about APFS running only on 64bit platforms is true?

### iPad Air 2 iOS 9 ###

![iPad Air 2 iOS 9](Screenshots/IMG_0099 iPad Air 2 ios 9.PNG)

### iPad Pro iOS 10.3 beta ###

![iPad Pro iOS 10.3 beta](Screenshots/IMG_0916 ipad pro ios 10.3 beta.PNG)

### iPhone 5 iOS 10.3 beta ###

![iPhone 5 iOS 10.3 beta](Screenshots/IMG_5809 iPhone 5 ios 10.3 beta.PNG)