Besides holding the SD card in I wonder if the cap is also being use as a cap.
It is not. It is on the end of along milled out stick. It is there purely to be a latch. This picture was making round a few weeks ago.
Well. Why not. Are there really "locking" (micro)SD card holders? Because the push-in kind that "locks" the card when pushed in and "ejects" it when pushed again is not ideal either. The card could get ejected if there are high vibrattions, or after a shock (such as the device falling down) that would trigger the mechanism.
When the card doesn't need to be accessed by users, I've seen the simple holders used more frequently. If there are "true" locking sockets (that is, which don't eject the card and would require a very specific action to unlock the card), I'd be glad to find one though.
Well. Why not. Are there really "locking" (micro)SD card holders? Because the push-in kind that "locks" the card when pushed in and "ejects" it when pushed again is not ideal either. The card could get ejected if there are high vibrattions, or after a shock (such as the device falling down) that would trigger the mechanism.
yes, Push-push type. it comes off due to vibration.
For such applications, I think it would be better to use eMMC or fix it with silicon, as other products do.
think the trouble of removing it later when it is fixed with adhesive, it may be ideal for applications where you want to remove it sometimes but don't want it to come off due to vibration.
Besides holding the SD card in I wonder if the cap is also being use as a cap.
I don't think cap is connected electrically. It's just a stopper.
When you need an internal Flash storage that acts as an SD card (so with a SDIO interface), there are chips that do just that (NAND Flash with SDIO) and can be almost drop-in replacements for SD cards if for such an "internal" use.
Of course, SD cards make it easier to replace the Flash if it wears out. And I guess SD cards are so ubiquitous that they can be sourced for very cheap, which is a lot less the case for the corresponding chips themselves.
