Cisco Cisco ASA 5512-X Adaptive Security Appliance Release Notes

You can check the size of internal flash and the amount of free flash memory on the ASA by doing the 
following:

ASDM—Choose Tools > File Management. The amounts of total and available flash memory 
appear on the bottom left in the pane.

CLI—In privileged EXEC mode, enter the dir command. The amounts of total and available flash 
memory appear on the bottom of the output.

For example:

hostname # dir

Directory of disk0:/

43     -rwx  14358528    08:46:02 Feb 19 2007  cdisk.bin

136    -rwx  12456368    10:25:08 Feb 20 2007  asdmfile

58     -rwx  6342320     08:44:54 Feb 19 2007  asdm-600110.bin

61     -rwx  416354      11:50:58 Feb 07 2007  sslclient-win-1.1.3.173.pkg

62     -rwx  23689       08:48:04 Jan 30 2007  asa1_backup.cfg

66     -rwx  425         11:45:52 Dec 05 2006  anyconnect

70     -rwx  774         05:57:48 Nov 22 2006  cvcprofile.xml

71     -rwx  338         15:48:40 Nov 29 2006  tmpAsdmCustomization430406526

72     -rwx  32          09:35:40 Dec 08 2006  LOCAL-CA-SERVER.ser

73     -rwx  2205678     07:19:22 Jan 05 2007  vpn-win32-Release-2.0.0156-k9.pkg

74     -rwx  3380111     11:39:36 Feb 12 2007  securedesktop_asa_3_2_0_56.pkg

62881792 bytes total (3854336 bytes free)

hostname #

In a failover configuration, the two units must have the same hardware configuration, must be the same 
model, must have the same number and types of interfaces, must have the same feature licenses, and must 
have the same amount of DRAM. You do not have to have the same amount of flash memory. For more 
information, see the failover chapters in Cisco ASA 5500 Series Configuration Guide using the CLI.

If you use two units with different flash memory sizes, make sure that the unit with the smaller flash 
memory has enough space for the software images and configuration files.

ASA 5500 Series CompactFlash, 256 MB

ASA5500-CF-256MB= 

ASA 5500 Series CompactFlash, 512 MB

ASA5500-CF-512MB=