Enable Mode Commands : System administration commands : image delete-all
  
image delete-all
Deletes all software image files on the disk.
Syntax
image delete-all
Parameters
None
Example
amnesiac # image delete-all
Product
SCC, Interceptor, SteelHead CX, SteelHead-v, Client Accelerator
Related Commands
“show images,” “show bootvar,” “show info,” show version