SanDisk 64&128GB Extreme PRO UHS-I SDXC Memory Card WARNING!
Several readers alerted me to SanDisk 64 GB & 128GB Extreme PRO UHS-I SDXC memory card incompatibility problems in Sony a7 III, a7R III & a9 card slot 1
Sony a7R IV review: The Hybrid Shooter’s Dream Camera - Videomaker
The Sony a7R IV supports SD/SDHC/SDXC (UHS-I and UHS-II) memory cards in both slot 1 and slot 2. You can also use microSD memory cards with this camera providing you use an appropriate adaptor.
Sony A1 vs Canon EOS R5
The Sony A1, with its dual memory card slots, can take two types of Memory Cards: SD cards and CFexpress Type A cards.