How to Clear an SD Card
The best way to clear an SD card of all data is to format it. While the primary purpose of formatting a device is to change its file storage system, formatting also effectively clears the device. Basic formatting removes the file system and replaces it with a new one. This is functionally the same as deleting all the files, and it frees up the entire SD card for new files. More thorough formatting also overwrites all of the data on the card randomly. This option is more secure because it prevents easy data recovery. Windows and macOS both include the necessary functionality to clear an SD card without any additional software, and they both let you choose between a faster but less secure option or a slower but more secure option.
How to Clear an SD Card in Windows
There are several ways to format a storage device on Windows, but the easiest is to right-click your SD card in the File Manager and open the formatting options from there. You can select the file system you want, and choose between a quick or full format. The quick option is faster, but it’s less secure. The full option takes longer because it overwrites the existing data so that nobody can access it in the future. Which you choose is up to you, but if the card is meant for you to use day-to-day, you are fine with the faster option. Here’s how to clear an SD card on Windows:
How to Clear an SD Card on a Mac
The best way to clear an SD card on a Mac is to format it using the Disk Utility app. If you want to prevent data recovery, you can select security options in Disk Utility and choose a secure formatting method. Here’s how to clear an SD card on a Mac:
Why Can’t I Clear My SD Card?
Full-sized SD cards come with physical lock switches that, when activated, put the card into a write-protected mode. When this mode is active, devices are unable to save any data to the card. If you try to clear an SD card and receive an error that your computer can’t format the card or you get a write protection error message, this switch is probably engaged. To switch an SD card out of write-protect mode, eject it from your computer and slide the switch to the unlocked position. Most cards indicate a direction of movement to engage the lock, so you unlock it by sliding the switch in the other direction. You can then place the card back into your computer to try to erase it.
