3Com SECPATH U200-CS Installation Manual page 19

At present, the USB interface provided on a U200 series device is a reserved module without
software support.
Use the USB flash drives provided by H3C only, because the U200 series may be incompatible
with other USB flash drives.
Avoid removing the USB flash drive when its LED is flashing. Doing so may cause the file system
on the drive to get corrupted.
CF card
1) Introduction
A compact flash (CF) card is used for storing logs, host files, and configuration files.
A U200 series device provides an external CF card slot for expanding storage space.
Three CF card options of different memory sizes are available:
256 MB
512 MB
1 GB
Use the CF cards provided by H3C only, because the U200 series may be incompatible with other CF
cards.
2) CF card slot
Figure 1-14 CF card
(1) Ejector button
(3) CF card LED (CF)
3) CF card LED
For description of the CF card LED, see Table 1-6.
(2) CF card slot
1-13