Hello. I am using qemu-5.2.0 in Windows with operating system Minix 3.1.2a and vfat fail to write files of size over 4096 bytes. The read works well. This is not ploblem of Minix 3.1.2a because in Bochs emulator reads an writes of files of any size works well.
I also consider this to be a major bug as it prevents communication of information between the guest OS and the host. I have over 300 students complaining about this bug present in qemu. Thanks. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/304636 Title: -hda FAT:. limited to 504MBytes Status in QEMU: Confirmed Status in qemu package in Ubuntu: Won't Fix Bug description: Binary package hint: qemu The size of the virtual FAT file system (for sharing a particular directory with Guest OS) is hard-coded to be limited to 504MBytes, in block-vvfat.c -- /* 504MB disk*/ bs->cyls=1024; bs->heads=16; bs->secs=63; -- If the directory contents exceeds this is stops with an assert -- qemu: block-vvfat.c:97: array_get: Assertion `index < array->next' failed. Aborted -- Also the FAT16 mode (default) only uses 8KByte cluster sizes which prevents the above being increased. 16KByte and 32KByte sectors can be selected with the following patch -- --- block-vvfat.c_orig 2008-12-02 12:37:28.000000000 -0700 +++ block-vvfat.c 2008-12-02 19:50:35.000000000 -0700 @@ -1042,6 +1042,12 @@ s->fat_type = 32; } else if (strstr(dirname, ":16:")) { s->fat_type = 16; + } else if (strstr(dirname, ":16-16K:")) { + s->fat_type = 16; + s->sectors_per_cluster=0x20; + } else if (strstr(dirname, ":16-32K:")) { + s->fat_type = 16; + s->sectors_per_cluster=0x40; } else if (strstr(dirname, ":12:")) { s->fat_type = 12; s->sector_count=2880; -- Cheers, Mungewell To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/304636/+subscriptions