Router>sh flash

Router>
Router>sh flash

System flash directory:
File  Length   Name/status
  3   5571584  c2600-i-mz.122-28.bin
  2   28282    sigdef-category.xml
  1   227537   sigdef-default.xml
[5827403 bytes used, 58188981 available, 64016384 total]
63488K bytes of processor board System flash (Read/Write)