Replace the SSD
As mentioned in Solid State Drive, the ASA ships with an SSD installed. You can replace this SSD should it fail; you do not need to power off the ASA to do so.
Follow these steps to replace a failed SSD in an ASA:
Loosen the thumb screws on both sides of the SSD bay and pull the existing SSD out of the bay.
Insert the new SSD into the bay and push it in until it is seated.
Tighten the thumb screws on both sides of the SSD bay.
Check the SSD LED to make sure the SSD is seated properly and functioning. See LEDs for a description of the SSD LED.
When you replace the SSD, you need to reinstall the module using the appropriate boot image.
For more information, refer to the list of ASA-related Quick Start guides on cisco.com: http://www.cisco.com/c/en/us/support/security/asa-5500-series-next-generation-firewalls/products-installation-guides-list.html