A Debian system performed a 'lazy' unmount of a portable hard drive when the drive was unplugged from a USB 2 port.
A card reader was then plugged into the port and an SD card was inserted into the card reader. Normally the SD card would be automatically mounted, but this time nothing happened. Some days later, a new card reader was plugged into the port and the SD card inserted into the new card reader. This time, the SD card was automatically mounted. Can anyone please explain why the above happened.
