My car stereo, in theory, cannot accept a drive over 32gb in size. In practice, I have a 128gb drive in there. I used a third party utility to format it as a FAT32 filesystem to be 128gb in size. The car stereo only claimed a 32gb limit only because that’s the largest fat32 filesystem Windows will make from the GUI.
Yeah, that's often the case. It's not really the size of the filesystem I think, my description was simplified. Believe when I got over N thousand songs it stopped working, which defeated the whole purpose of having my entire music collection on a drive. Still works on the home stereo though.
Fun fact: the FAT32 limit - which, by the way, was literally just added by Dave Plummer because he thought anything larger would have too much wasted slack space - made its way into the SD card spec. It is perfectly valid behavior for a device to refuse to read a >32GB card with a FAT32 file system, or a <32GB card with exFAT, or a card with multiple partitions, etc. None of those are actually SD cards as they are formatted.
In practice, nobody in their right mind would design a device's firmware that poorly, unless they were deliberately trying to force users to stay within the bounds of the device's QA test procedures. I don't have any examples of this. There are devices that will misbehave with such a card, however: for example, the Nintendo 3DS will happily use an oversize FAT32 card, but the Data Management screen will take way longer to load for some reason.
Also fun fact: the first time you plug a correctly formatted SDXC into a Nintendo Switch, it "downloads an update" and restarts. Presumably Nintendo wanted to save money on exFAT licensing fees so Nintendo is only paying for each unit that actually uses the exFAT library?
3- Yup, nailed it, same reason WMA and Flash require "activation" on the PSP and why newer MPEG codecs like H.264 and AAC require an "optional media update" on the Xbox 360
2- The slowdown usually comes from scanning the FAT to count the free space, with the PSP being notorious for this
Another related point is the varying support for the "semi-official" 64K cluster size, which gives a curious effect on the 3DS: in GBA mode (officially only used for 10 games only distributed as compensation to those who bought the original model at full launch price), a strip of "junk" (coming from the virtualized GBA's VRAM, IIRC it's just wraparound) will be shown at the bottom of the screen...
My car stereo, in theory, cannot accept a drive over 32gb in size. In practice, I have a 128gb drive in there. I used a third party utility to format it as a FAT32 filesystem to be 128gb in size. The car stereo only claimed a 32gb limit only because that’s the largest fat32 filesystem Windows will make from the GUI.