F5030有两块600GB的硬盘，怎么查看剩余的空间大小

<F5080-D_2>dir ?
  /all                   Display all files and directories in the current
                         directory
  /all-filesystems       Display the files and directories in the root
                         directories of all storage media
  >                      Redirect it to a file
  >>                     Redirect it to a file in append mode
  STRING                 [drive][path][file name]
  chassis1#slot0#flash:  Device name
  chassis1#slot1#flash:  Device name
  chassis1#slot2#hda0:   Device name
  chassis1#slot2#hdb0:   Device name
  chassis1#slot2#sda0:   Device name
  flash:                 Device name
  |                      Matching output
  <cr>                  

<F5080-D_2>dir chassis1#slot2#hdb0:/
Directory of chassis1#slot2#hdb0: (VFAT)
The directory is empty.

468736064 KB total (468736032 KB free)

<F5080-D_2>