I use my sd card slot for additional storage by buying this: https://www.amazon.com/Transcend-JetDrive-Expansion-MacBook-TS1TJDL330/dp/B09R4G9Z79?ref_=ast_sto_d

I use my sd card slot for additional storage by buying this: https://www.amazon.com/Transcend-JetDrive-Expansion-MacBook-TS1TJDL330/dp/B09R4G9Z79?ref_=ast_sto_dp&th=1 https://www.amazon.com/Transcend-JetDrive-Expansion-MacBook-... I use it for noncritical data because the sd card is slow and it could fail. Mainly recent downloads or video files.