@Felthry Basically? USB supplanted it.
@LexYeen PCMCIA (which was just miniaturized PATA) could do 133 MB/s, while USB 2.0 high speed was limited to 60 MB/s (480 Mbps), so it seems like USB wasn't quite fast enough to really supplant PCMCIA until USB 3 came out in the 2010s, though
-F
@LexYeen and it feels like a SATA-based PCMCIA-equivalent could have been far faster than USB 2, given that by 2004 you could have 300 MB/s SATA II speeds
Or even better, a PCIe-based replacement, with 250 MB/s per lane--you could probably fit four lanes in a PCMCIA-sized form factor, possibly even more, giving you a GB/s or more transfer speeds
-F
@LexYeen sorry i got a bit rambly there
-F
@Felthry Saaaaaaaaaaaaaaaaaa-[48 hours later]-aaaaaaame.