There was more than one Inspiron with the "7420" designation. If you have the Inspiron 14R SE 7420, Dell drivers page says that you have a Realtek Memory Card Reader and they have a Windows 10 driver available to download. Free tools like Speccy or Belarc Advisor may be able to identify it, as can various bootable Linux distributions. Before installing drivers, you should install the Intel Chipset Driver and Intel Management Engine Interface Driver.
I recently cleaned reinstall Windows 11, is my card reader Realtek Memory Card Reader Driver or Genesys Memory Card Reader Driver? I do not want to use supportassist
inspiron 14 7420 card reader question