Why is my SD card only showing 28MB instead of the full 32GB?

Another thing to consider is that sometimes SD cards can get corrupted, which might cause them to show incorrect capacity. You might want to try formatting it using a different tool than Diskpart, maybe something like SDFormatter, which is specifically designed for SD cards. Just keep in mind that formatting will wipe data off the card. If it still shows 28MB after that, it may be a sign to replace it.

It sounds like you might be seeing 28MB due to a couple of reasons. If you meant 28GB, there's a normal discrepancy between how manufacturers label storage (base-10) and how your computer reads it (binary). A 32GB card typically shows up as about 29.8GB in your OS because of this. However, if it's actually showing only 28MB, you could have a counterfeit card, which are unfortunately quite common. If you've got access to another device, try checking the card there as well to see if it reads differently.

Just to clarify, I understand you’re going offline for a day or two, but I’d really recommend double-checking it when you're back. It’s crucial to ensure your card isn’t fake, especially since you want to use it for homebrew. If it continues to show the wrong capacity, you might want to consider returning it or getting a new one.