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General • modern macOS struggles with FAT16, FAT32

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Just wanted to put out a feeler to see if anyone else is having the same problems I am.

I have been having a lot of trouble getting macOS Ventura to mount FAT16 and FAT32 filesystems on SD card. Typically the error is "failed with 71" if you use (sudo) mount, or simply "Permission denied" if you use (sudo) mount_msdos.

I've experimented with different sector sizes, and at one point I managed to partition and format an SD card with FAT16 from a linux box which macOS was about to read, and then I was able to use 'mount -u -w' to remount it read-write.

Unfortunately, I've not been able to replicate that success since, even using the same commands on linux.

The one time I got it to work, the sequence was (on linux):
  • create a 1GB partition (MBR partition table type)
  • change the partition type to "e" (W95 FAT16 LBA)
  • format the partition with mkfs.fat -F 16 -S 512 -n NAME /dev/mmcblk0p1
Has anyone else had widespread problems with FAT on macOS?

Statistics: Posted by cellularmitosis — Fri Jul 19, 2024 3:34 am — Replies 0 — Views 20



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