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GNU mtools 4.0.30 released

From: Alain Knaff
Subject: GNU mtools 4.0.30 released
Date: Fri, 18 Jun 2021 00:26:55 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0


I am pleased to announce the release of GNU mtools version 4.0.30

GNU mtools is available for download from and the mirror sites worldwide (see for the list of those).

The sources can be obtained from and its world-wide mirrors:    (527K)   (433K)    (373K)

The same directory also contains pre-compiled Debian packages.

Mtools is a collection of utilities to access MS-DOS disks from GNU
and Unix without mounting them, to change FAT-specific file attributes
(hidden, archive, system), and to format FAT media.

Mtools supports W32 style long file names, FAT32, OS/2 Xdf disks and
2m disks (store up to 1992k on a high density 3 1/2 disk). Mtools also
includes mpartition, a simple partitioning programing. It is also a
convenient tool to work with disk image files (thanks to the -i flag).

For more information on mtools, including links to file downloads,
please see the mtools web page:

Please email bugs or suggestions to <>.

Improvements since the 4.0.29 release are:
        - Fixed XDF floppy disk access
        - Fixed faulty behavior at end of image in mcat
        - Device/Image size handling refactoring
        - allow remap to write to zero-backed sectors (may happen if
          buffer is flushed, and is not an error in that case)
        - Raise an error when trying to mcopy multiple source files
          over a single destination file (rather than directory)
        - fix handling of "hidden" sectors (is a 2 byte quantity on
          small disks, not 4 byte as previously assumed)
        - Modernize partition support. Tuned consistency check to
          actually check about important issues (such as overlapping
          partitions) rather than stuff nobody else cares about
          (alignment on entire cylinder boundaries)
        - Move various "filter" options (partition, offset, swap,
          scsi) into separate classes, rather than leaving almost
          everything in plain_io
        - Simplify and centralize geometry handling and LBA code
        - Fix some more more compiler warnings



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