erase startup-config
erase start
On NVRAM.
show startup-config
wr or copy running-config startup config
On NVRAM.
NVRAM
NVRAM
Data stored in nvram is erased
NVRAM is that router component in which start up configuration file is stored.
NVRAM Stores startup-config. The IOS (Internetwork Operating System) is stored in the flash. Both flash and NVRAM are non volatile storages but there is a major difference.
issue the erase flash command
nvram
Data Stored in the NVRAM will be erased