Hi List As said in $subject, truncate --size 64M fs.img mkfs.fat -A fs.img # -A for Atari variant blkid fs.img # nothing (a real disk image with partitions can also be downloaded here https://subsole.org/st_mint ) However fsck, and kernel can check and mount this partition. The kernel detects properly the fat when mounting a block device, without having to force the filesystem on the command line. >From this doc about the Atari fat format, info-coach.fr/atari/documents/_mydoc/Atari_HD_File_Sytem_Reference_Guide.pdf I see on page 9 that the main differences between MS DOS and Atari FAT, is about the fat logical sector size, which can goes over 512 bytes in the Atari FAT, whereas in MSDOS FAT it is always 512 bytes. fsck.vfat -v fs.img fsck.fat 4.1 (2017-01-24) Checking we can access the last sector of the filesystem Boot sector contents: System ID "kdosf" Media byte 0xf8 (hard disk) 2048 bytes per logical sector <---- more than 512 bytes However after a quick glance on the code in fat_valid_superblock() at https://github.com/karelzak/util-linux/blob/master/libblkid/src/superblocks/vfat.c#L218 it seems to me that libblk should would work with sectors up to 4096 bytes, so I am bit puzzled. Any pointers on what could be missing here ? Manu -- You know an upstream is nice when they even accept m68k patches. - John Paul Adrian Glaubitz, Debian OpenJDK maintainer
