Following are the most common reasons why your SD card is not up to full capacity. So, if this is the case it just means you have brought the wrong SD card. Which is not so familiar in popular brands such as SanDisk or Transcend but most common in cheap brands. Many users have reported that the SD card or a USB drive does not have the same storage space as they claimed. It might due to technical errors such as bad sectors, virus attacks, or even corrupted partitions on your SD card or USB drive. There are various reasons why your SD card showing the wrong size. Read the article to know about the manual methods that can be used to fix the micro SD card. To restore the lost capacity of the SD card and fix the SD card that is showing the wrong size error, first format the SD card to its full capacity and then, use a professional Data Recovery Software like Remo SD Card Recovery Tool to recover data from the formatted SD card if you have failed to create a backup in advance. Summary: SD Card showing the wrong size or a memory card showing less space on your computer? No Worries.