Android · Storage & Backup
Format and manage a microSD card
SD card storage settings let you choose how a microSD card is used — as portable storage for easily removable files, or formatted as internal storage that extends the phone's built-in space (adoptable storage).
How to open SD Card Storage
- Insert the microSD card and tap the notification that appears, or go to Settings > Storage.
- Tap the SD card entry.
- Choose 'Use as portable storage' or 'Format as internal storage'.
- Follow the on-screen prompts to complete formatting, then tap Eject before removing the card physically.
What you should know
- Portable storage keeps the card readable in other devices like cameras or computers.
- Adoptable/internal storage encrypts and formats the card so it's treated as part of the phone's internal storage, and apps can be installed to it.
- The Storage settings screen shows the SD card as a separate entry with its own used/free breakdown.
- 'Eject' safely disconnects the card before physical removal to avoid data corruption.
A card formatted as internal (adoptable) storage is tied to that specific phone and generally can't be read in another device without reformatting, which erases its contents.
Why it matters
Choosing the right SD card mode up front avoids a painful surprise later — the wrong choice can mean losing the ability to move files to a computer, or losing all data if the card needs to be reformatted after the fact.
Best practices
- Choose portable storage if you'll ever want to read the card in a camera, computer, or another phone.
- Choose adoptable/internal storage only if you mainly want more app-install space and won't need to remove the card often.
- Always use 'Eject' before physically removing the card to avoid corrupting files mid-write.
Common problems and fixes
- The phone doesn't recognize a newly inserted SD card.
- Reseat the card, try it in another device to confirm it isn't faulty, and check it's formatted in a filesystem the phone supports (usually exFAT or FAT32).
- Apps set to install to the SD card stop working after the card is removed.
- This happens with adoptable storage since apps and data can live partly on the card; reinsert the same card or move the apps back to internal storage first.
Tips and tricks
- Back up an SD card's contents to a computer or cloud storage before switching its format, since the switch always wipes the card.
Frequently asked questions
Can I switch a card from portable to internal storage later?
Yes, but doing so reformats the card and erases its existing contents, so back up any files first.
Do all Android phones support SD cards?
No, many modern phones (including most Pixels) don't have an SD card slot at all — check your specific model.
Related settings
- Storage & CleanupStorage settings show a breakdown of what's using space on your device — apps, photos, videos, and cached data — and offer one-tap tools to clear space safely.
- Files by GoogleFiles by Google is Android's built-in file manager, letting you browse, search, and organize files on your device, plus a Clean tool that surfaces junk files, duplicate photos, and unused apps you can remove in a couple of taps.
- Backup & RestoreAndroid can automatically back up app data, call history, contacts, device settings, and photos to your Google Account, making it easy to restore everything on a new or reset device.
More Storage & Backup guides for Android
- Google Photos BackupGoogle Photos backup automatically uploads your camera roll to your Google Account, so photos and videos survive a lost, broken, or replaced phone and stay accessible across all your devices.
- Free Up Space ToolThe Free Up Space tool scans the device for large files, unused apps, duplicate downloads, and old screenshots, then suggests safe items to delete to reclaim storage.
- Cached Data ManagementLets you view and clear the temporary cache files each app stores for faster loading, either per app or across all apps at once, without deleting saved account data or settings.
- Download ManagerThe built-in Download Manager (accessible via the Files app or browser downloads) lists files downloaded from browsers, email, and other apps, letting you open, share, or delete them from one place.
- Google Drive Storage ManagementControls which folders and files sync to Google Drive, shows how much of your Google storage quota is used, and lets you free space by removing large or duplicate cloud files.
- Switch & Transfer Data from Old PhoneGuides you through transferring contacts, photos, apps, messages, and settings from an old Android or iPhone to a new device, using a cable, Wi-Fi, or cloud backup.