** Description changed: 1. $ lsb_release -rd Description: Ubuntu Xenial Xerus (development branch) Release: 16.04 2. $ apt-cache policy dosfstools dosfstools: - Installed: 3.0.28-2 - Candidate: 3.0.28-2 - Version table: - *** 3.0.28-2 500 - 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages - 100 /var/lib/dpkg/status + Installed: 3.0.28-2 + Candidate: 3.0.28-2 + Version table: + *** 3.0.28-2 500 + 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages + 100 /var/lib/dpkg/status 3. mkfs.vfat should exit with non-zero value if it cannot create enough clusters on the target device. This is fatal to compliant FAT filesystem parsers since cluster count is the *only* way to determine the FAT type (12, 16, 32). $ sudo mkfs.vfat -S 4096 -F 32 /dev/vda1; echo ? sudo: unable to resolve host ubuntu mkfs.fat 3.0.28 (2015-05-16) WARNING: Not enough clusters for a 32 bit FAT! 1 4. $ sudo mkfs.vfat -S 4096 -F 32 /dev/vda1; echo $? sudo: unable to resolve host ubuntu mkfs.fat 3.0.28 (2015-05-16) WARNING: Not enough clusters for a 32 bit FAT! 0 Tools calling mkfs.vfat expect the tool to return non-zero values when it encounters and error. Making a FAT32 filesystem on a device that is not big enough means that FAT parsers will fail to recognize the device. In particular, UEFI expects a FAT32 partition and will fail to read the boot partition if it's not formatted properly (ie, not big enough for 65526 clusters[A]). mkfs.vfat defaults to 8 sectors per cluster, for 4k disks, we set sector size to 4k, which means for -F 32, we have 65526 clusters * 8 * 4096 wihich is just under 2G, meaning to avoid the warning/error -F 32 requires either a lower sectors per cluster, or a larger target device. - - - 1. https://staff.washington.edu/dittrich/misc/fatgen103.pdf [Page 15] + A. https://staff.washington.edu/dittrich/misc/fatgen103.pdf [Page 15] ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: dosfstools 3.0.28-2 ProcVersionSignature: User Name 4.4.0-18.34-generic 4.4.6 Uname: Linux 4.4.0-18-generic x86_64 ApportVersion: 2.20.1-0ubuntu1 Architecture: amd64 Date: Tue Apr 12 20:10:06 2016 Dependencies: - gcc-6-base 6-20160405-0ubuntu2 - libc6 2.23-0ubuntu2 - libgcc1 1:6-20160405-0ubuntu2 + gcc-6-base 6-20160405-0ubuntu2 + libc6 2.23-0ubuntu2 + libgcc1 1:6-20160405-0ubuntu2 ProcEnviron: - TERM=xterm - PATH=(custom, no user) - XDG_RUNTIME_DIR=<set> - LANG=en_US.UTF-8 - SHELL=/bin/bash + TERM=xterm + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=en_US.UTF-8 + SHELL=/bin/bash SourcePackage: dosfstools UpgradeStatus: No upgrade log present (probably fresh install)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1569576 Title: mkfs.vfat exits zero on fatal warning To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dosfstools/+bug/1569576/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
