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---
tag: m0020
title: List SD Card
brief: List the contents of the SD Card.
author: thinkyhead
requires: SDSUPPORT
group: sdcard
codes: [ M20 ]
related: [ M33 ]
notes:
- Requires [`SDSUPPORT`](/docs/configuration/configuration.html#sd-card)
parameters:
-
tag: F
since: 2.0.9.4
optional: true
description: Only list BIN files. Used by host plugins to facilitate firmware upload.
requires: CUSTOM_FIRMWARE_UPLOAD
values:
-
type: flag
-
tag: L
since: 2.0.9
experimental: true
optional: true
description: Include the long filename in the listing.
requires: LONG_FILENAME_HOST_SUPPORT
values:
-
type: flag
-
tag: T
since: 2.1.2
optional: true
description: Include the file timestamp in the listing.
requires: M20_TIMESTAMP_SUPPORT
values:
-
type: flag
examples:
-
pre: List the contents of the SD card
post: The firmware will send no other output between "Begin file list" and "End file list."
code: |
> M20
Begin file list
MYFILE.GCO 14129
SUBDIR~1/MORETH\~1.GCO 68447
End file list
ok
-
pre: List files with long filename (for display)
post: This format produces a prettier File Manager in OctoPrint, but the long name is not used in selecting the file to print, nor are folder long names included.
code: |
> M20 L
Begin file list
MYFILE.GCO 14129 MyFile.gcode
SUBDIR~1/MORETH\~1.GCO 68447 Sub Directory/MoretHall.gcode
End file list
ok
-
pre: List files with file modification timestamp (for display)
post: OctoPrint 1.9+ uses the timestamp to display file upload times.
code: |
> M20 T
Begin file list
MYFILE.GCO 14129 0x5515758F
SUBDIR~1/MORETH\~1.GCO 68447 0x55195745
End file list
ok
> M20 L T
Begin file list
MYFILE.GCO 14129 0x5515758F MyFile.gcode
SUBDIR~1/MORETH\~1.GCO 68447 0x55195745 Sub Directory/MoretHall.gcode
End file list
ok
---
List all printable files on the SD card back to the requesting serial port in compact DOS 8.3 format. Only files with `.gcode`, `.gco`, and `.g` extensions will be listed. Hidden files (beginning with `.`) will not be listed.
Hosts or serial controllers should send `M20` to get a DOS 8.3 file listing of the active media device that includes file sizes.
The file size is included in the output since Marlin 1.1.0.
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