Verbatim SSD ExpressCard 64GB Review: Unlock the potential of that unused ExpressCard slot on your laptop by adding up to 64GB of SSD storage, courtesy of the Verbatim SSD ExpressCard - PC
I-O Data Readying ExpressCard SSDs | TechPowerUp
New ThinkPad Mod: ExpressCard to NVMe SSD Adapter - Thinkpads Forum
For old ThinkPads: Retrofit NVMe SSD with an ExpressCard adapter - storage