I'm excited about this to upgrade my old hard-drive iPod. Replacing the hard drive with an SD card should increase battery life considerably, and this is more than 8x larger than the hard drive it came with.
If it dies, I lose no data since it's just a copy of my music library. And the speed doesn't matter since I only need to sync things once and from there it's just incremental additions.
The reason I consider this is that there don't seem to be any decent music players with large capacity, as everyone moved their music playing to their phones.
I've delved into flash on iPods, though I haven't taken the plunge yet. You might want to look at https://www.iflash.xyz - there are adapters for multiple sd and micro sd cards, resulting in ridiculously large volumes. I think RAM limits the total number of songs supported, is the next bottleneck.
I've seen those adapters, but I'd prefer to use only one SD card and a simple (read: less likely to have weird edge-cases) adapter. But I haven't taken the plunge myself either, mainly because high-capacity SD cards are still pretty expensive.
I think RAM will be less of an issue for me since I run Rockbox[0] on the iPod. No need to keep the whole database in memory there. I like everything about the iPod except the software (pretty much the same as other apple products :)
If it dies, I lose no data since it's just a copy of my music library. And the speed doesn't matter since I only need to sync things once and from there it's just incremental additions.
The reason I consider this is that there don't seem to be any decent music players with large capacity, as everyone moved their music playing to their phones.