Corrupted flash drive controller software caused by low grade or generic NAND memory.

Invalid data in the Master Boot Record (MBR) or Partition Boot Record (PBR) or directory structure on the USB drive: Data stored in MBR, PBR or about directory structure may go wrong, which can cause the drive unable to work since they carry the information about how and where the operating system find and read data stored in each sector.

Therefore when connected again to your PC, the flash drive cannot be recognized by operating system.

Data corruption after the drive unmounted improperly from the port: You may unplug your flash drive without clicking 'eject' last time, which leads to data corruption in your drive.

The main solution to physical errors is to seek for the help of professionals. Logical errors can be corrected with some DIY tricks while physical one cannot be solved without professional knowledge. Why Is Flash Drive Not Working or Unrecognized?įlash drive issues can be boiled down to two categories of errors, logical one and physical.

What are these errors and what's going wrong with your USB drive? How can we recover data from inaccessable or formatted USB drive.

It's quite common to see your USB drive cannot be shown and opened with the appearance of all kinds of errors on your desktop such as 'USB flash drive not recognized', 'Please insert a disk into removable disk', 'You need to format the disk before you can use It' and 'RAW USB drive', etc.

How to recover pen drive using cmd