You will need another computer with an SD card reader to install the image. Before you start, don't forget to check the SD card requirements PrepaidGiftBalance
Connection issue. The SD card is not well connected to computer because of damaged USB port, adapter, card reader, etc.
SD card is locked. The SD card that cannot be recognized might be write protected, which means computer cannot read or detect it.
Improper operation. Though many SD card support hot plug, which means you can insert or remove it from device while it is running, frequently usage may lead to metal wires or corrupt file system.
Drive letter is lost. As we all know, a partition without a drive letter cannot be accessed in Windows Explorer. If a SD card loses its drive letter, it won't be displayed in system.
Corrupted driver. If the SD card does not show up in system, but it can be seen in Device Manager with a yellow mark, there might be something wrong with its drivers. In this case, it can be seen in Disk Management instead of Windows File Explorer.
Partition loss. It is possible that partition on SD card gets deleted and then the SD card is full of unallocated space.
The SD card is physically damaged. Physical SD card damage may involve damaged plastic shell, drop to water, etc. In some cases, you cannot even insert the SD card into a card reader.