My ps vita doesn't detect SD2VITA.

[Aukiv]

My ps vita doesn't detect SD2VITA.

[ap-401]

I faced the same problem and the same exact error in my log file:

GC2SD detection...
GC2SD not detected.

The issue was with the formatting of my SD card. I formatted using the Disk Utility in Mac and it was leaving the default partition of the SD card. I was able to format it correctly in Terminal. Commands below:

diskutil list
diskutil unmount /dev/disk2s1
sudo newfs_exfat -R /dev/disk2

[craigerrington]

I just wanted to comment to say that the fix mentioned by @ap-401 was the same for me.

The new Disk Utility leaves a lot to be desired. Manually setting the card in the terminal seems like the most sure fire way to do this on a Mac.

[Aukiv]

I already solved it, it was my sd2vita that was defective, I had a 2.0 and now I bought a 3.0 works perfect.

[nezumisama]

I have the Chinese v5 (white with black text) SD2VITA adapter. I had the same problem, and it turned out to be a hardware problem. I removed the adapter, pressed the MicroSD card into it a bit, and poped it back, after lo and behold, after a reboot I had it mounted as ux0! I wish the error message was a little bit specific.

[QuantumMobileDevelopment]

I was also getting the same exact error in my log.
Thank you ap-401
diskutil list
diskutil unmount /dev/disk2s1
sudo newfs_exfat -R /dev/disk2
Fixed it.