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MKFS.CPM(1) User commands MKFS.CPM(1)


mkfs.cpm - make a CP/M file system


mkfs.cpm [-f format] [-b boot] [-L label] [-t] [-u] image


mkfs.cpm makes a CP/M file system on an image file or device.


Use the given CP/M disk format instead of the default format.
Write the contents of the file bootblock to the system tracks instead of filling them with 0xe5. This option can be used up to four times. The file contents (typically boot block, CCP, BDOS and BIOS) are written to sequential sectors, padding with 0xe5 if needed.
Label the file system. This is only supported by CP/M Plus.
Create time stamps.
Show all CP/M file names in upper case.


Upon successful completion, exit code 0 is returned.


Any errors are indicated by exit code 1.


CPMTOOLSFMT Default format


/etc/cpmtools/diskdefs CP/M disk format definitions


This program is copyright 1997–2021 Michael Haardt <>. The Windows port is copyright 2000, 2001, 2011 John Elliott <>.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.


fsck.cpm(1), cpmls(1), mkfs(1), cpm(5)

November 2, 2022 CP/M tools