System Management Configuration Guide, Cisco Catalyst IE3x00 Rugged, IE3400 Heavy Duty, and ESS3300 Series Switches

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System Management Configuration Guide, Cisco Catalyst IE3x00 Rugged, IE3400 Heavy Duty, and ESS3300 Series Switches

Disable an SD card

Updated: June 26, 2026

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Configure the system to disable an SD card on a Cisco IOS XE switch using either ROMMON mode or switch CLI mode.

Disable an SD card on a Cisco IOS XE switch to prevent the system from recognizing or accessing the SD card storage.

You can disable an SD card on a Cisco IOS XE switch using two different methods: ROMMON mode or switch CLI mode.

Procedure

  1. To disable an SD card on a Cisco IOS XE switch, choose one of these options:

    • ROMMON mode: Set the SD card-related ROMMON variable to yes.
    switch: set var DISABLE_SD_FLASH=yes
    • Switch CLI mode: Disable the SD card on the switch using the command in configuration mode.
    Switch(config)# no sdflash

  2. (Optional) After logging in to the switch, the SD card does not appear in the list of file systems. To confirm, use the show file systems command.

    Switch# show file systems 

File Systems:
Size(b) Free(b) Type Flags Prefixes
- - opaque rw system:
- - opaque rw tmpsys:
518885376 474765312 disk rw crashinfo:
* 1697755136 1133522944 disk rw flash: bootflash:
1711341568 1645002752 disk ro webui: 
- - opaque ro xmodem:
- - opaque ro ymodem:
- - opaque rw null:
- - opaque ro tar:
- - network rw tftp:
33554432 33492400 nvram rw nvram:
- - opaque wo syslog:

  3. (Optional) To confirm that the SD card has been disabled, use the dir sdflash: command.

    Switch# dir sdflash:

%Error opening flash:/sdflash (No such file or directory)