Command:

erase


Mode:

Router#

Syntax:

erase {filesystem:| start-up config}


Syntax Description:

filesystem:

File system name followed by a colon.

start-up config Erase contents of configuration memory

Command Description:

To erase a file system, use the erase EXEC command.The erase nvram: command replaces the write erase command and the erase startup-config command.

When a file system is erased, none of the files in the file system can be recovered.

The erase command can be used on both Class B and Class C Flash file systems only. To reclaim space on Flash file systems after deleting files using the delete command, you must use the erase command. This command erases all of the files in the Flash file system.

Class A Flash file systems cannot be erased. You can delete individual files using the delete command and then reclaim the space using the squeeze command. You can also use the format command to format the Flash file system.

On Class C Flash file systems, space is dynamically reclaimed when you use the delete command. You can also use either the format or erase command to reinitialize a Class C Flash file system.

The erase nvram: command erases NVRAM. On Class A file system platforms, if the CONFIG_FILE variable specifies a file in Flash memory, the specified file will be marked "deleted."


Example:

The following example erases the NVRAM, including the startup configuration located there:

erase nvram:
 

The following example erases all of partition 2 in internal Flash memory:

Router#erase flash:2


System flash directory, partition 2:
File  Length   Name/status
  1   1711088  dirt/images/c3600-i-mz
[1711152 bytes used, 15066064 available, 16777216 total]

Erase flash device, partition 2? [confirm]
Are you sure? [yes/no]: yes

Erasing device... eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee ...erased
 

The following example erases Flash memory when Flash is partitioned, but no partition is specified in the command:

Router#erase flash:


System flash partition information:
Partition   Size     Used    Free    Bank-Size   State       Copy-Mode
    1       4096K    2048K   2048K   2048K       Read Only   RXBOOT-FLH
    2       4096K    2048K   2048K   2048K       Read/Write  Direct

[Type ?<no> for partition directory; ? for full directory; q to abort]
Which partition? [default = 2]
 

The system will prompt only if there are two or more read/write partitions. If the partition entered is not valid or is the read-only partition, the process terminates. You can enter a partition number, a question mark (?) for a directory display of all partitions, or a question mark and a number (?number) for directory display of a particular partition. The default is the first read/write partition.

System flash directory, partition 2:
File  Length   Name/status
  1   3459720  master/igs-bfpx.100-4.3
[3459784 bytes used, 734520 available, 4194304 total]

Erase flash device, partition 2? [confirm] <Return>


Misconceptions:
None

Related Commands:
delete
copy
dir
cd

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