Why is Express card 54 slot used?

Answer 1

It is an expansion slot intended for the addition of external periphal devices (kind of like the slots found internally in the computer for hard-drives or other hardware devices or sound/video cards). USB and firewire have been a more popular way for people to add external devices becasue many devices do not require high bandwidth- external hard drives or flashdrives connected via USB may have slow transfer rates when compared to that of an ExpressCard , however, the speed is not necessarily a big deal because external hard drives are not meant to be continuously accessed but are used primarily for portible/backup storage. A USB port, however, would not be ideal for certain applications such as high bandwidth internet connections or sound cards. ExpressCards are meant to be the new standard that replaces the PC/PCMCIA cards. It is faster and more compact than the traditional PC Cards. They have fast data transfer rates, so they are ideal for TV tuners, ethernet adapters, sound cards, external drives, etc. It's much faster than the PC Card because it directly connects to the system bus via PCI Express and USB 2.0.