I always have connected to my MBPr a Transcend JetDrive Lite 330.

JetDrive Web

I have installed Ubuntu on that SD Card, so it has EXT4 file system. I installed some packages on the Mac for being able to mount that SD Card in case I need it. The packages are:

I'm completely able to mount the SD Card volume to a mountpoint which I created for this purpose:

sudo mount -t fuse-ext2 /dev/disk2s1 ~/.linux/

Now you know the antecedents.

Every time I turn on the Mac, the system shows this message.

SD Card File System was not readable

Is there any way to avoid this message? I don't want to auto mount the SD Card, I have created an alias for that. I need to avoid this message. It's very annoying.

diskutil list shows the following:

sudo diskutil list

/dev/disk2s1 is ubuntu

/dev/disk2s2 is, obviously, the swap

/dev/disk2s3 has no format. I didn't use it. I plan to install there some other things or use as more space. I didn't decided yet.

  • Hi klanomath, I download the .dmg from SourceForge and execute the .pkg . I install fuse-ext2 v0.0.7 – user161254 Aug 8 '16 at 17:41
  • In my opinion this is either related to the FileVault encryption of your main drive or one/two of the 3 partitions of the SD card is/are formatted with an other file system than ext4. – klanomath Aug 8 '16 at 18:04
  • disk2s2 is a swap. disk2s3 hasn't be formatted yet. I think is the swap partition. – user161254 Aug 8 '16 at 18:12
  • I finally delete the swap partition and format the disk (except linux partition) in exfat. All goes good now. Thanks klanomath – user161254 Aug 12 '16 at 14:17

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