When writing a file to an SD card with a FAT32 file system on MacOS14 (sonoma), the file size and content will differ from the original file.
This is especially true for large files.(over2GB）
Is this a problem with macOS14?
MacBook Air (M2, 2022)
yuki109 wrote:
When writing a file to an SD card with a FAT32 file system on MacOS14 (sonoma), the file size and content will differ from the original file.
This is especially true for large files.(over2GB）
Is this a problem with macOS14?
FAT32 file system FAT32 stands for File Allocation Table32, an advanced version of the FAT file system. The FAT32 file system supports smaller cluster sizes and larger volumes than the FAT file system, which results in more efficient space allocation. FAT32 file systems support a maximum partition size of 32 GB.
The maximum size file size is 4 GB.
yuki109 wrote:
When writing a file to an SD card with a FAT32 file system on MacOS14 (sonoma), the file size and content will differ from the original file.
This is especially true for large files.(over2GB）
Is this a problem with macOS14?
FAT32 file system FAT32 stands for File Allocation Table32, an advanced version of the FAT file system. The FAT32 file system supports smaller cluster sizes and larger volumes than the FAT file system, which results in more efficient space allocation. FAT32 file systems support a maximum partition size of 32 GB.
The maximum size file size is 4 GB.
The issue in less an issue in macOS, of any version.
Rather the Choice by the User to use a Non Native Apple External drive format
FAT32 does have a file size limitation, maximum of 4 GB
Just copying it will corrupt the file. All file sizes are less than 4GB.
example)
2,537,349,120 bytes (less than 4GB)
Copy source file
md5sum: f65ad930a4e80dbd2197bbf9ee495bd5
SD card file
md5sum: 21b131453469450e467c578f652b9bc6
The file size may change from 2,537,349,120 bytes to 220 bytes.
This only happens on macOS14.
This does not occur on macOS 13 or earlier even if the same SD card reader/writer and SD card are used. There is no change in macOS14.1.
Some 3rd party software can also interfere. Recently QBitTorrent produced weird errors for some users.
File this under Weird: In Monterey copyin… - Apple Community
I and others have found that the Fat32 system with Sonoma has deteriorated in function. I attempted to copy some files to my Fat32 drive and it was much slower than with Monterey so something has changed. So file corruption may also be an issue.
SD cards are fragile and prone to this type of issue
Files are corrupted when copying to FAT32 on macOS14 (sonoma)
