How to fix SD card not readable, mounted, working, showing up on Mac?

Posted by Tim to Mac Data Recovery on February 26th, 2020

Summary: Have you encountered a SD card unreadable/corrupted problem? The SD card not showing up/working on Mac? The SD card won't format? This post will offer you solutions to fix these issues. But before that, download free data recovery software to recover lost data from unreadable/corrupted/damaged SD cards.

SD card has been widely-used on phones, digital cameras and many other devices to save files. It has gradually become the easiest and most efficient way to expand storage capacity of devices. But sometimes, our SD card may get damaged or have errors on it and become unreadable. When this happens, you can't access the card on phone, digital camera or computer. Here is a complain from a forum:

Last night, my phone just stopped recognizing my SD card, which unfortunately contained some important data. I tried the card in my Mac computer but it is not accessible with an error message: "The disk you inserted was not readable by the computer". Is there a program or method I can use to capture the data from the card even if it's not being recognized. Any advice is appreciated.

SD card is prone to corruption, leading to loss of all the stored photos, videos and audio files on Mac. When your SD card becomes unreadable, corrupted or unmounted, you must be very eager to know how to fix the corrupted SD card as well as get lost files back. Read on!

How to recover unreadable SD card on Mac?

Before fixing unreadable SD card, you should firstly recover lost data from unreadable SD card. The good news is that the lost data still remains on the SD card until it is overwritten.

Things you should know before data recovery

When you realize you have lost data on your SD card, stop all write operations immediately, including saving files, deleting files, reformatting the card. These actions will create new files which may write over the original data. If the old data have been overwritten, it's impossible to recover. Therefore, to increase the chance of data recovery, please take the card out of the camera or phone and find a professional data recovery tool.

Recover lost data from unreadable SD card on Mac with M3 Mac Data Recovery

M3 Mac Data Recovery is the best free SD card data recovery software that can recover lost data from unreadable SD card, recover deleted or lost files from SD card, recover lost data from formatted SD card, recover lost data from unmountable SD card, recover lost data from corrupted SD card, etc.

M3 Mac Data Recovery can recover many file formats, including JPG, PNG, TIFF, MOV, MP4, and many RAW camera formats. This software performs SD card data recovery on macOS 10.15/10.14/10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8.

Besides, M3 Mac Data Recovery can also recover deleted or lost photos, files, music files, videos, emails from hard drive, external hard drive, pen drive, USB flash drive, memory card, CF card, etc. It is read-only and safe to use which will never write to your drive during the recovery process.

Tutorial to recover lost data from unreadable SD card on Mac with M3 Mac Data Recovery

1) Launch M3 Mac Data Recovery.

M3 Mac Data Recovery software

2) Select the unreadable SD card and click "Next" to scan lost data on it.

3) Preview the scanning results, choose files we need, and click "Recover" to get them back.

4) Check to ensure you have got all lost files back.

How to fix/repair unreadable SD card on Mac?

After successfully getting lost files back, we can fix unreadable SD card on Mac without worries.

Connect the SD card to another computer

First of all, you should check what the matter is. Is it the problem with the SD card or your Mac computer? Just plug the SD card to another computer. If it is readable at this time, there is something wrong with your Mac. In this case, you should ask for help from Apple support. Otherwise, the card may be at fault.

Try a different SD card reader or slot

If you connect the SD card with a reader or slot, you should check whether it is damaged. Plug the card out and then reinsert it with a different SD card reader or slot to see if it works fine.

Check if the SD card is BitLocker encrypted

The next thing is to check the incompatibility between the SD card and your Mac computer. If your SD card is BitLocker protected, then it can't be recognized on Mac. Because BitLocker is developed by Microsoft and macOS doesn't support it. To make sure of this issue, you can connect the SD card to a PC. If Windows can recognizes it and ask for password, it is BitLocker encrypted. Under this circumstance, you should decrypt the SD card on your PC and then reinsert it to your Mac computer.

Run First Aid to repair the unreadable SD card

If these methods above fails to fix the unreadable SD card, the SD card may have some file system errors. Luckily, you can easily check disk errors and repair the corrupted file system with built-in First Aid.

1) Go to Applications > Utilities > Disk Utility.

2) After launching Disk Utility, choose "View" from the upper right menu bar. From the drop-down menu, select "Show All Devices".

3) Choose the unreadable SD card and click on "First Aid".

4) Click "Run". This will start the verification and repair process.

When Disk Utility has run its checks, you will see a drop-down window. If Disk Utility reports that the disk appears to be OK or has been repaired, you're done. You can click "Show details" to view more information. If Disk Utility fails to repair your corrupted SD card, you will be asked to back up as much of your data as possible and then reformat the SD card

Format the SD card on Mac

If Disk Utility fails to repair your SD card, the SD card has been severely damaged. The final fix is to reformat the SD card on Mac. But this operation will erase all your data stored on the SD card, please make sure you have recovered lost data with M3 Mac Data Recovery.

1) Go to Applications > Utilities > Disk Utility.

2) Choose View > Show All Devices.

3) Click the icon of the unreadable SD card on the left part of the window.

4) Click "Erase" on the top of the Disk Utility window.

5) Complete related information (name, format, scheme), then click the "Erase" button.

Send the SD card to a local repair shop

If the SD card can't be formatted, it means the SD card has been physically damaged. Unfortunately, there is no software can help you fix any hardware problem. You can only send it to a local repair shop or replace it with a brand-new one.

What is an SD card and how to use it?

An SD card or a Security Digital card is a type of removable flash memory cards used for storing documents, media and other files. It is designed to provide high-capacity storage in a small size and can be added in many small devices such as mobile phones, digital cameras, audio players, digital video camcorders, etc. Now SD card is available for different types ranging from memory cards, SD cards to Mini SDs. But the most common use of these types is the SD card.

What is a SD card? As a smaller variant of the SD card, it is used in certain cell phones and other mobile devices. Though a SD card is about the size of your fingernail, don't fool by its appearance, these little thing can help you store up to Gigabytes.

When our SD card becomes unreadable, we must be very eager to know how to fix unreadable SD card as well as get lost files back. This passage will introduce how to fix/recover unreadable SD card on Mac and recover lost data from unreadable SD card on Mac.

Why the SD card is unreadable?

There are various reasons that can cause SD card not readable error on Mac. The following are some common factors:

  • Corruption of the partition table.
  • Virus and Malware infection affecting the SD card.
  • Improper removal of the SD card from the device.
  • Physical damage to the SD card.