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.
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 a compact flash memory card in a cisco 3631, enter the show flash: command.
if the content of the compact flash memory card displays, the card was formatted with a class b flash file system. if the geometry and format information of the card displays, the card was formatted with a class c flash file system.
the following example shows output for an internal compact flash memory card formatted with a class c flash file system:
the following example shows output for an internal compact flash memory card formatted with a class b flash file system:
formatting compact flash memory as a dos file system
to format a compact flash memory card with a class c flash file system, use the format command.
to format a new internal compact flash memory card, or to remove the files from a previously installed internal compact flash memory card, enter the format flash: command.
the following example shows output for formatting an internal compact flash memory card formatted with a class c flash file system:
formatting compact flash memory as a class b flash file system
to format a compact flash memory card with a class b flash file system (lefs), use the erase command.
to format a new internal compact flash memory card, or to remove the files from a previously installed internal compact flash memory card, enter the erase flash: command.
the following example shows output for formatting an internal compact flash memory card with a class b flash file system:
