Once your SD card is connected, you can easily format it within Windows File Explorer. Bear in mind that most methods will require you to format your SD card, so be sure to back up what data you can before doing so. Tired of knowing there is extra space on your SD card that you could be using? The below methods will guide you through restoring your SD card to full capacity. The fixes will also apply to other SD card variations, including micro SD cards not showing full capacity. Many of the solutions we’ll look at are blanket fixes that fix other generally related problems, such as if your SD card is full or not accessible. You can test your SD card to see if it’s fake using FakeFlashTest.
😈 Fake SD card – Scammers can modify the card controller to make the SD card read like it has more storage than it actually does. These chips have a limited number of possible write cycles before they fail, but they can also fail due to physical damage. ⚡ NAND memory corruption – SD cards use NAND memory chips to store data. This space can be used, but only once it is formatted with a file system (or used to extend an existing partition). 🔍 Unallocated space – SD card lost space may in fact be unallocated space that hasn’t been formatted. 📁 File system corruption – When the file system on the SD card becomes damaged or corrupted, one or more of your partitions will not display correctly and you may seemingly lose a chunk of storage from the SD card. When you format a card above 32 GB using an incompatible reader, it will only format up to 32GB, leaving the remaining space unallocated. ❌ SD card reader incompatibility – Some older card readers don’t support SDHC and SDXC cards. 🤖 Viruses – Viruses can infect your SD card and do a number of malicious things, including damaging your file system so storage sizes don’t display correctly. In addition to that, there are a few common reasons why an SD card won’t show full capacity: Therefore, the total capacity will be lower than exactly specified. It’s common for manufacturers to measure 1 GB as having 1000 MB when in reality each GB contains 1024 MB. SD card not showing full capacity? Well first, look at how the storage number is measured by the manufacturer. How to Recover Data From SD Card After Fixing Capacity. Method #4: Expand Size Using Unallocated Space. Method #2: Format Using Disk Management. 
How to Restore SD Card to Full Capacity.
Why Does SD Card Not Show Full Capacity.
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