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I'm trying to format a CF card on Mac Osx 10.14.4 to exFAT with a specific block size of 4MB, with this terminal command:

sudo newfs_exfat -b 4194304 -v exFAT /dev/disk3s1

It appears to have worked…

Volume name      : exFAT
Partition offset : 63 sectors (32256 bytes)
Volume size      : 125059009 sectors (64030212608 bytes)
Bytes per sector : 512
Bytes per cluster: 4194304
FAT offset       : 2048 sectors (1048576 bytes)
# FAT sectors    : 2048
Number of FATs   : 1
Cluster offset   : 4096 sectors (2097152 bytes)
# Clusters       : 15265
Volume Serial #  : 5e319fb9
Bitmap start     : 2
Bitmap file size : 1909
Upcase start     : 3
Upcase file size : 5836
Root start       : 4

…but then it refuses to mount the volume afterwards:

Volume on disk3s1 failed to mount
If the volume is damaged, try the "readOnly" option

Any ideas please?

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  • This question and answer may be helpful.
    – IconDaemon
    Jan 29, 2020 at 17:26
  • Out of curiosity - why the 4MB block requirement? Feb 11, 2020 at 15:28
  • I was experimenting with larger block sizes than default to write HD raw-video data to the CF card.
    – RiverTim
    Feb 12, 2020 at 16:03

1 Answer 1

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Answering my own question here! Use this wonderful app, which mounts the disk perfectly: exfat

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