No limit.

One thing I'd like to see on these DAPs with 2 microSD slots is the capability to show merged source navigation.    I'd love to browse info from 2 sources on the same scroll like it was one big drive!!  

  I think it all fits inside the DX50 silicone case (as shown in a previous post), apart from the lumpy back look.

  I think you're doing the right thing by sharing your findings in an unexplored subject.    Keep it up!  

I'm pretty happy with the stability and features of the 1.2.7 release.   I hope that, from now on, our discussion is mainly about amps, storage sizes, sound quality and wallpapers.    

 Are you sure about that?   When you installed FW1.2.6, did it create an "album_img" folder with images in the MicroSD card? I'm sure mine didn't.   Well, enjoy the update anyway. 

  The "audio.db" started in 1.2.6 as you said, but I'm referring to the "album_img" folder which is now created in the MicroSD card.    I'm 100% sure this starts in 1.2.7. Up until now it was only created in the internal memory.

I've noticed that on the 1.2.7FW the ".album_img" folder (and content) is created in a redundant way if you use a microSD card.   Something like this:   Internal Memory:    - .album_img>images   MicroSD>     -.audio_data>audio.db     -.audio_data>album_img>images

  Thanks for the info.   I'm seriously considering doing something in that vein in the future. I desperately need 500GB to fit my flac collection!!  

  Have you done any tests regarding the effects on DX50's battery life using this kind of setup?

I can't comment on those technicalities, but reading some information about this product, it seems to announce smartphone compatibility.    http://news.cision.com/integral-memory-plc/r/integral-introduces-the-usb-3-0-portable-solid-state-drive,c9372294   So, if it could work on a smartphone...

  Good thing I haven't mentioned my potentially EXPENSIVE dream combination!   DX50 + Kingston 512GB data traveller!!!!  ...

  True, but has anyone tried SSD in the USB OTG context?    http://www.amazon.co.uk/Integral-512GB-Solid-State-Drive/dp/B00BHUNTHI/ref=sr_1_3?ie=UTF8&qid=1386062036&sr=8-3&keywords=external+ssd+integral#productDetails   They require much less power. I'm pretty sure that they won't be too...

 "Eleventh batch: 800pcs, will be shipped on Dec 10th."   The DX50 has got to be iBasso's greatest success ever!

  +1