How to unforget SD card?

SD readers do not end to have a spring to fling the device across your desk. So the drive would seem to be 'forgotten' after a successful 'eject'.

To read it again, you must completely remove the ejected drive, wait a short while, then re-insert it again later. if no joy, restart your Mac and try again.

Hi,

If you mean you initialized SD card, I think you can't salvage data on SD card.

I am not familiar with any command in any Application resembling "forget".

¿What were you running, and what command did you choose to accomplish "forget" ??