fsck.cpm - Man Page

Name ..

fsck.cpm - check a CP/M file system

Synopsis .

fsck.cpm [-f format] [-n] [-u] image

Description .

fsck.cpm is used to check and repair a CP/M file system.  After reading the directory, it makes two passes.  The first pass checks extent fields for range and format violations (bad status, extent number, last record byte count, file name, extension, block number, record count, size of .COM files, time stamp format, invalid password characters, invalid time stamp mode).  The second pass checks extent connectivity (multiple allocated blocks and duplicate directory entries).

fsck.cpm can not yet repair all errors.

Options .

-f format

Use the given CP/M disk format instead of the default format.

-T libdsk-type

libdsk driver type, e.g. tele for Teledisk images or raw for raw images  (requires building cpmtools with support for libdsk).


Open the file system read-only and do not repair any errors.


Show all CP/M file names in upper case.

Return Value .

Upon successful completion, exit code 0 is returned.

Errors .

Any errors are indicated by exit code 1.

Files .

/usr/share/cpmtools/diskdefs CP/M disk format definitions


CPMTOOLSFMT     Default format

Diagnostics .

image: used/total files (n.n% non-contiguos), used/total blocks

No inconsistencies could be found.  The number of used files actually is the number of used extents.  Since a file may use more than one extent, this may be greather than the actual number of files, but a correct measure would not reflect how many files could still be created at most.  A file is considered fragmented, if sequential data blocks pointed to by the same extent do not have sequential block numbers. The number of used blocks includes the blocks used for system tracks and the directory.

Authors .

This program is copyright 1997–2021 Michael Haardt <michael@moria.de>.  The Windows port is copyright 2000, 2001, 2011 John Elliott <jce@seasip.demon.co.uk>.

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.

See Also .

fsck(8), mkfs.cpm(1), cpm(5)

Referenced By

cpm(5), fsed.cpm(1), mkfs.cpm(1).

November 2, 2022 CP/M tools User commands