Erasing a config and vlan.dat file in Catalyst 4507R Switch

Hi,
I am unable to erase the configuration from Catalyst 4507R Switch.When i do "write erase" and reload the switch,the configuration still remains on the switch.
Switch1#write erase
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
[OK]
Erase of nvram: complete
mp024-dc-nr00#sh start
startup-config is not present
After this i did reload and configuration still didn't get removed.
I tried
erase /all nvram:
reload
This also didn't help.
I also tried:
erase /all non-default
reload
This also didn't help.
Can anyone suggest how to erase the config on Catalyst 4507R Switch.
Thanks,

Hi Saroj,
do you see the below symtoms:
Cat4500# write erase
Erasing the nvram filesystem will remove all files! Continue? [confirm]y[OK]
Erase of nvram: complete
Cat4500# reload
System configuration has been modified. Save? [yes/no]: n
!--- Do not save the configuration at this prompt. Otherwise, the switch
!--- reloads with the current running configuration and does not reset to default.
Proceed with reload? [confirm]y
2w0d: %SYS-5-RELOAD: Reload requested
To erase the vlan.dat file on the 6500/6000 switches, issue the erase const_nvram: command. On the 4500/4000 switches, issue the erase cat4000_flash: command. On the fixed configuration switches, issue the delete flash:vlan.dat command.
HTH
Regards
Inayath

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Erasing a config and vlan.dat file in Catalyst 4507R Switch

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