How to use the PC CardExpressCard slot

Another major hardware and device change has been the shift in markets from traditional desktop computers to laptop computers In the days of

An industry standard architecture expansion slot is an older type of slot that was commonly used in early personal computer systems These slots

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slot easy slot? And is it possible to have a SSD drive in a HDD slot? I'm not planning on replacing the current SSD, but adding another SSD into my pc