PC slate allows you to expand your devices storage capacity with Compact Flash cards or IBM Microdrive which could be used in the PCMCIA II slot.

Compact Flash are like small floppy disks which come in various capacities ranging from 2MB to 1GB

The IBM Microdrive provides breakthrough storage capacity for portable electronic devices in an industry-standard CF+ Type II form factor. In addition, users can access more applications and maintain large databases, while notebook users can back up and transport their data more quickly and conveniently.

Increased capacity, portability, and value

With capacities ranging from 340 MB to 1 GB on a single hard disk drive, the IBM family of Microdrives provides high-capacity, cost-effective personal storage. Weighing only 16 grams, the IBM Microdrive provides outstanding capacity in a compact, portable package-a key requirement for today's handheld devices. Higher performance, improved productivity With a maximum sustained data rate exceeding 4 MB/sec, the IBM Microdrive provides a significant performance improvement over current flash memory. As a result, large files can be transferred very quickly, and users can be much more productive.