Detecting presence of SD-card on HP-50g

[DavidM]

(07-16-2021 01:51 PM)Claudio L. Wrote:  Having said that, if you pull the card WHILE it's still writing on the card you will end up with a damaged file system.
In addition, some SD cards have INTERNAL caching and delayed writing, so turning off the calculator or pulling the card quickly after writing to it also risks ending up with a damaged file system.
So while you don't need to turn the calculator off, you do need to be patient and wait several seconds after you write to the card before you cut power to it. Cutting power means: turning the calculator off, pressing the reset button, pulling batteries, pulling the card out.

Thanks, Claudio. That makes a lot of sense, and I think it explains why it's so easy to corrupt the file system on SD cards when used with a 49g+/50g.