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External SSD not mounting when connected to MacBook Pro. Not showing on Desktop, not showing in Finder, also not showing in Disk Utility.

I am aware of several fixes e.g.:

  • Finder > Settings > General and check Show these items on desktop: check External disks

  • Finder > Settings > Sidebar and check External disks

... however the above won't fix the issue on latest macOS (after update), the drive isn't mounted, can't find the external disk and/or container in Disk Utility. One detail: when the SSD is connected, an unreadable alert window is showing for a fracture of a second.

2 Answers 2

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It's a Security related update in macOS Ventura, the OS will not allow new accessories. The "Allow accessory to connect?", "Do you want to connect ... to this Mac?" alert will flash and disappear.

Solution

System Settings > Privacy & Security > scroll down and find Allow accessories to connect.

Default should be Ask for New Accessories change it to Automatically When Unlocked until this bug is fixed by Apple.

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    Is this Mac model specific? On my two Intel Macs, when I search for "allow accessories", I am directed to "Privacy and Security", but there is no "Allow accessories to connect".
    – Gilby
    Dec 29, 2022 at 8:37
  • Could be, this is an M1. Let’s see, maybe someone will confirm if it is model specific.
    – Yatko
    Dec 30, 2022 at 12:53
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    Aug 1, 2023 this is still Unsolved (Apple M2 2023, Ventura 13.4)
    – Yatko
    Aug 1, 2023 at 15:59
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If this happen after ejecting disk without proper unmounting you can fix this by following next steps:

  • Go to Activity Monitor
  • Quit fsck_exfat (or else if you disk has another file system)
  • Go to Activity Monitor
  • Run First Aid

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