Before reformatting the corrupted SD card, make sure you have recovered data from that SD card. If not, try iBoysoft Data Recovery to do an SD card data recovery. After backing up the data, it is time to reformat your SD card on Mac with following methods: Option 1: Format your SD card with Disk Utility. Navigate to the 'Format' or 'Format Memory Card' item in the menu, which is often found within the 'Setup' screen. Select/highlight the 'Format' or 'Format Memory Card' item and then press 'OK'. In case a confirmation message appears, confirm your intend of formatting the card by selecting 'Yes' and pressing 'OK'.

• When you format a memory card, you should be prepared for everything to be deleted from the file. But in reality, it might still be possible to recover files from the card even after formatting. If you find yourself needing to try, take a look at my post on how to recover files from SD cards.
• SD Card Formatter is a software that provides quick and easy access to all SD, SDHC, and SCXC memory card formats. It's designed so you can get rid of everything saved on your SD memory card all in one go.
• Select the memory card in the Drives column. Select the 'Erase' button in the top row of radio buttons. Select the format you wish to use to format the Memory Card on the Volume Format pop-up button. Use 'Mac OS Extended (Journaled)' for use on Macs, and 'MS-DOS (FAT)' to share the memory card with both Macs and PCs and other devices.

Format an SD card in your computer.

Here is a link that shows you how to reformat an SD card (or MicroSD card) on your Mac. The steps are also written out below.

1. Connect the SD card to your computer by using an external card reader. Save all the files from your SD card that you want to keep to your computer before moving to step 2. Formatting the SD card deletes all the data off of the card.
   1. Note – If you’re using a Micro SD card, please insert the Micro SD card into the SD card adapter that came with card. Connect the SD card adapter to your computer by using an external card reader.
   2. Also note – Mac OS 10.6.5 or earlier does not support exFAT format, which most 64 GB SD cards are formatted to. This means that you won't be able to format or use exFAT card on your computer. In this case, we'd recommend either upgrading your OS to 10.6.6 or later, or using an SD card that's already formatted to MS-DOS (FAT) or FAT32 to complete the below steps.
2. Open Disk Utility. To do this, click on the magnifying glass in the top-right corner of your computer screen. Type “disk utility” in the search box that opens, then click on the “Disk Utility” Application that comes up.
3. Find the SD card in the left side of the window. It’ll be named something like NO NAME or UNTITLED.
4. Click the ERASE tab in the middle of the window.
5. Next, click on the Format dropdown menu. Select MS-DOS (FAT) if the card is 32 GB or smaller. If it’s a 64GB card, please select ExFAT.
6. A message will appear asking, “Are you sure you want to erase the partition “[YOUR SD CARD NAME]?” Click Erase. The computer will delete the contents of your SD card and format it. You’re all done.

Step 1: Bring up Desktop View

If you are not already in Desktop View, bring up Desktop View by pressing the Windows key + D on your keyboard.

Step 2: Open 'Computer'

Open up the 'Computer' window by pressing Windows key + E on your keyboard.

Format Memory Card On Computer

Step 3: Display right-click options

Your SD card should be displayed in the 'Devices with Removable Storage' section. Right-click on your SD card to bring up the right-click menu options. Select Format.

Step 4: Format the SD card

1. In the Format window make sure that the correct File System is selected. It should be set to FAT32 for 32GB SD cards and EXFAT for 64GB SD cards.
2. Select Quick Format.
3. Click Start.
4. Once the formatting is complete, you can close the window.

Congratulations! You have formatted your SD card.

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