A) Sort of. I have a SanDisk 512GB SDXC card, and it formats correctly. But the iPod&#x27;s iTunesDB library is limited to 35000 songs. So for most people, there&#x27;s no point in having more than 128GB. Rockbox is not my music player, because I want my play counts to sync back to iTunes. I still want more capacity, but see my explanation in D) WiFi.<p>B) Weight is not an issue for me (I started with a 1G in February 2002 - everything else seems light).<p>C) Battery life is longer with SD cards than hard drives, but that&#x27;s not a big issue for me. Sync speed is also faster, which is a small bonus.<p>D). WiFi is the big feature that put the iPod back in my pocket. (It was gone from October 2011 when I got a 64GB iPhone 4S until March 2015).<p>My iPhone&#x27;s got a lot of space, but 10GB of Wiki2Touch (offline Wikipedia), 2GB of Galileo Offline Maps take a toll, before I even start to sync my 85GB main music library (my external library is over 300GB, but it isn&#x27;t duplicate-sorted; it&#x27;s the backups from friends&#x27; iPods).<p>When I had an old iBook with a 10GB hard drive, and a 30GB iPod, I backed up my entire disk to my pocket. That was awesome. If my bag were stolen, I&#x27;d lose my laptop and external hard drive but not my pocket-sized backup.<p>Now I have a lot more data, and I want to access it from my phone. The 512GB SDXC lets me backup my laptop. The PQI Air Card only supports microSD, but I use an SD female to microSD male ribbon cable adaptor. Power to the card comes from the iPod through the iFlash.<p>My &quot;WiPod&quot; is therefore effectively an AirStash (SD to WiFi) and iPod in one. It&#x27;s also useful for copying photos from friends&#x27; cameras.<p>During many of my iPod-less days, I had a Raspberry Pi in an iPod shell in the belt clip case. That had host USB, so I could also mount iPhones using libimobiledevice and copy music from friends. Most of the time I just used it for photos, though. I&#x27;m still trying to find a way to get host USB into my iPod, though. The CoreWind WiFiG25 is my current favourite (it&#x27;s small enough to fit in the iPod&#x27;s case). But CoreWind still didn&#x27;t finish the WiFi driver for Debian.<p>If backup is so important, why didn&#x27;t I use mSata for 1TB instead of 512GB? Because I only have 512GB of data, and accessing the files is as important as carrying them. Everybody uses SD, and sharing over WiFi to my phone is super useful. And I can backup my laptop to the SD card (only 2 USB ports) while my iPhone and mouse are plugged in.