SD card does not mount on startup after 13.4.1 update?

SD card does not mount on startup after 13.4.1 update?

SD card is used for Time Machine and left in the slot.


MacBook Pro 16 inch, 2021

MacBook Pro 16″, macOS 13.4

Posted on Jul 5, 2023 4:47 AM

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Question marked as Best answer

Cracked it. 

Apple have changed some Security setting in 13.4.1:


Went to ‘System Settings’ > ‘Privacy & Security” then Scrolled Down to ‘Allow Accessories to Connect’ - then changed setting from ‘Ask for New Accessories’ to ‘Automatically When Unlocked” and ...


(Needless to say ‘Allow Accessories to Connect’ had not been touched before this problem.)


SD card now does mount on startup after 13.4.1 update


AppleCare were semi-useful on this problem. 

Posted on Jul 6, 2023 4:33 AM

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Question marked as Best answer

Jul 6, 2023 4:33 AM in response to VAIO

Cracked it. 

Apple have changed some Security setting in 13.4.1:


Went to ‘System Settings’ > ‘Privacy & Security” then Scrolled Down to ‘Allow Accessories to Connect’ - then changed setting from ‘Ask for New Accessories’ to ‘Automatically When Unlocked” and ...


(Needless to say ‘Allow Accessories to Connect’ had not been touched before this problem.)


SD card now does mount on startup after 13.4.1 update


AppleCare were semi-useful on this problem. 

SD card does not mount on startup after 13.4.1 update?

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