macOS Ventura users please read

[Jeff8356]

With macOS Ventura (13) there is a new security feature for USB and Thunderbolt devices.  This new feature will not allow your Mac to communicate with these devices until YOU approve them.  Which means you will likely not be able to read your SD card data from your xPAP until you change the setting.  They specifically state "portable computers" but it might be worth trying on iMac's also.

From the Apple Developer Release Notes:

Accessory Security
New Features

• On portable Mac computers with Apple silicon, new USB and Thunderbolt accessories require user approval before the accessory can communicate with macOS for connections wired directly to the USB-C port. This doesn’t apply to power adapters, standalone displays, or connections to an approved hub. Devices can still charge if you choose Don’t Allow.
  
  You can change the security configuration in System Settings > Security and Privacy > Security. The initial configuration is Ask for new accessories. Configuring an accessibility Switch Control sets the policy to always allow accessory use. Approved devices can connect to a locked Mac for up to three days.
  
  Accessories attached during software update from prior versions of macOS are allowed automatically. New accessories attached prior to rebooting the Mac might enumerate and function, but won’t be remembered until connected to an unlocked Mac and explicitly approved. (43338666)
  

Source: https://developer.apple.com/documentatio...ease-notes
It's unclear if you would need to logout or reboot after changing this setting.