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    Category: APSF

    Solve challenges in regards to APSF formatted disk volumes, Apple’s proprietary file system designed to enhance performance and security on macOS.

Blog posts

Schematic visualisation of a broken external SSD drive and the error message Type Unknown

Recover files of an unmountable APFS partition on a portable SanDisk SSD drive

Bugged firmware broke my disk. But recovery worked!

Oliver 14. September 2023
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Teaser image showcasing the macOS Disk Utility cannot mount error for Apple_HFS volume

Recover data from HFS volume when Disk Utility fails with “Could not mount (com.apple.DiskManagement.disenter error 49153)”

How to still recover data from an unreadable Apple_HFS volume/CD/DVD in macOS Catalina

Oliver 29. February 2020
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Screenshot of macOS Disk Utility successfully reformatted internal Volume to APFS

Solution approach: fixing APFS disk issue “fsroot tree invalid” in macOS High Sierra Public Beta 4 (17A315i)

Completely erasing & reformatting a broken APFS volume under macOS High Sierra Beta 4 fixed the “fsroot tree error” – make sure you have an up to date backup before upgrading High Sierra Beta updates.

Oliver 21. August 2017
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Issue: macOS High Sierra Beta 4 (17A315i) breaks APFS formatted drive

Just a quick note, as this seems not to be mentioned anywhere so far:

Apple recently released Public Beta 4 of macOS High Sierra (Build 17A315i) – which broke my APFS formatted external SSD drive; kind of.

[…]

Oliver 16. August 2017
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macOS High Sierra Wallpaper with OS name

Solved: macOS High Sierra beta issues with APSF for a bootable external drive

macOS High Sierra beta is booting successfully from an external APFS formatted SSD disk. Read the full story here.

Oliver 11. July 2017
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