For old ThinkPads: Retrofit NVMe SSD with an ExpressCard adapter - storage
New ThinkPad Mod: ExpressCard to NVMe SSD Adapter - Thinkpads Forum
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128GB Wintec FileMate SolidGO ExpressCard 34 SSD
Buy MZHOU PCI-E to USB 3.0 PCI Express Card incl.1 USB C and 2 USB A Ports,Adding M.2 NVME SATA III SSD Devices to a PC or Motherboard Using M.2 NVME to
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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
Verbatim SSD ExpressCard – up to five times faster than USB based ExpressCards