Chkdsk /f G:

C:\WINDOWS\system32>chkdsk /f G:
The type of the file system is exFAT.
Volume Serial Number is 56FA-C1D8
Windows is verifying files and folders...
Volume label is Sandisk.
File and folder verification is complete.

Windows has scanned the file system and found no problems.
No further action is required.

   7814624 KB total disk space.
    136288 KB in 967 files.
      2592 KB in 81 indexes.
         0 KB in bad sectors.
        64 KB in use by the system.
   7675680 KB available on disk.

     32768 bytes in each allocation unit.
    244207 total allocation units on disk.
    239865 allocation units available on disk.