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Software Configuration Guide For Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-04
A P P E N D I X
B
Formatting the Compact Flash Memory Cards
This appendix describes how to format the compact Flash memory into a Class B Flash file system,
known as the low-end file system (LEFS), or into a Class C Flash file system, which is similar to DOS.
It also describes how to perform file and directory operations in each file system.
Formatting Procedures for Compact Flash Memory Cards
The following sections describe formatting procedures for internal and external compact Flash memory
cards.
Formatting Procedures
Cisco recommends that you erase (Class B) or format (Class C) new compact Flash memory cards to
initialize them with either a Class B or Class C Flash file system. This ensures proper formatting and
enables the ROM monitor to recognize and boot the Flash.
The Class B Flash file system is also known as the low end file system (LEFS).
The Class C Flash file system is similar to the standard DOS file system.
Note A compact Flash memory card formatted with the standard DOS file system does not support booting
from the ROM monitor.
Determining the File System on a Compact Flash Memory Card
To determine the file system of an external compact Flash memory card, enter the show slot0: all
command. To determine the file system of an internal compact Flash memory card, enter the
showflash:all command.
• If geometry and format information is not displayed, the card is formatted with a ClassB Flash file
system.
• If geometry and format information is displayed, the card is formatted with a ClassC Flash file
system.
The following examples show outputs for Class B and Class C Flash file systems:
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