The Memory Stick is a proprietary memory device, in the beginning only used in
devices made by SONY. But now they are available in mobile computers made by
other manufacturers, too. The current sticks are USB devices and work with
all recent kernels. After loading the
you may mount them as SCSI devices, often as
For older laptops see the appropriate pages at Linux-on-Laptops.
There is also a SONY Memory Stick Floppy Adapter - MSAC-FD2M. I don't know whether this works with Linux.