Size, and I’m assuming speed but I don’t know anything about the express card interface so it might be slow.
Also if you just want to cram more drive in your laptop
Also if you just want to cram more drive in your laptop
“What's the speed limit?
The ExpressCard slot is limited to a single PCI-E 2.0 lane. This means the real-world speed bottleneck is 500MB/s, which is roughly the speed of SATA 6Gb/s (SATA 3).
Pre-Sandy Bridge models (T410/X201 and older) are limited to PCI-E 1.1, which is roughly 250MB/s.”
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¹ — https://www.indiegogo.com/projects/thinkmods-expresscard-nvm...