SD cards are fairly cheap. That's part of the reason they get used so much. But if you have a new-ish one, especially an expensive high-capacity card, and you switch phones, you'll probably want to reuse it. I don't blame ya one bit, and all you really need to do is clean them up a little and they will drop right in. Here's what you need to know.
About those old files
An SD card you've used in an Android phone will have a bunch of files on it. Some of them you might have put there, like things you've downloaded; others are placed there by apps like your camera, and others just pop up and might have weird names you don't recognize. Those are all files your old phone needed, but your new phone doesn't.
Taking care of the files you saved to the card and media in folders like Pictures or Ringtones is simple. I'd suggest you copy them somewhere else like your Google Drive storage, so you can reformat the card (that's just easier), but if you want them on your new phone, you can leave them right where they are. Just remember that if you do format the card in your new phone, they are gone forever. Services with storage like Google Photos and Google Drive come free with your Google account — don't be afraid to use them!
Old files can be useful, but just remember that when you format the card, they're gone forever.
You might have a folder called DCIM if you've told the camera in your old phone to save photos to the SD card. You can take a peek inside of it and you'll see that it's filled with your photos, but can also have what appear to be duplicates of photos with a name that's almost the same. Depending on the camera app on your old phone, those are from things like portrait mode shots, panoramas, photospheres, or any other type of photo that's not a "regular" picture.
Your new phone might not be able to understand what to do with those, especially if you're moving from one brand to another. But Google Photos does. I'd recommend you upload every photo on your phone to Google Photos, and use the Photos app to delete the ones you don't want in the cloud. But don't delete the rest just yet, because Google Photos doesn't save the full resolution and quality of your pictures unless you tell it to do so. Take the whole folder and upload it somewhere the same as you might have done with documents or other things you wanted to keep from the step above. This is actually a great place to keep the original copies if you use an app from the Play Store to create a .zip file from them all.
The important part is to make sure you've saved them somewhere so you can have your new phone format the SD card. That erases everything.
The other files — ones in the Android folder or nested inside another folder are fine to delete. Some may be encrypted and can't be read by any other phone; others might not be. But every one of them was created by an application and will be recreated and populated once an apps need to do so. If you plan to format the card in the new phone as suggested, ignore them. Otherwise, delete them.
Adoptable storage and App Lockers
None of this applies if you used your SD card as an adoptable storage device in your old phone. When you do that, the card is formatted as an encrypted drive and can't be read by any other device except the phone that encrypted it.
To reuse the card, you'll need to reformat it. If your new phone allows you to use an SD card as an adoptable storage drive, you'll still need to reformat it. You do this through the dialog when you first insert the card and the system asks you what you want to do with it.
This same advice probably goes for any type of App Locker app you might have used. An App Locker takes applications and "hides" them or can hide specific content like risque photos or private documents. You need a password to see these hidden apps and media files. If you use the same App Locker app on your new phone it might be able to retrieve those files, so check before you format anything. I'd suggest you unlock any media files you want to keep and back them up somewhere, then lock them back up once you're done.
Do you really want to reuse your SD card?
SD cards aren't super expensive, but if you're like me, you want to use anything you've bought until it falls apart. That's not the best idea when it comes to SD cards.
Unless your old SD card is Class 10 or faster, you don't probably don't want to reuse it. It will make apps that use the SD card for data run slower, it will take longer to copy files that you like, and your new camera probably can't even use it for things like burst photos or 4K video. Technology moves fast and cards that were fine just two or three years ago when you bought your old phone are too slow by today's standards.
Thankfully, SD cards aren't nearly as expensive as other types of computer storage. The very best high-capacity card is only going to set you back about $100, and you can get a high-quality, fast SD card for your phone for about $30. If your new phone has a camera that can take HD video, you'll be very glad you sprung for a new card.
If you followed this advice, you can pop your old card in your new phone and say yes when it asks if you want to format it. Once that's finished it's ready to go with your new phone and you can start filling it up again. Remember though, SD cards don't live forever so always be sure to back up your important files regurlarly!
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