Summary

My USB flash drive has 32GB memory size, created the Linux Boot system on the USB, now change back to normal USB flash drive usage, cannot be readable and it shows only 500M memory when formatting, use diskpart.exe solved the problem.

Problem and solution

Refer to this Link, go to “Start”, input “cmd”, then “diskpart.exe”

Microsoft DiskPart version 10.0.14393.0

Copyright (C) 1999-2013 Microsoft Corporation.
On computer: LENOVO-XHL-PC

DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
  Disk 0    Online          238 GB  1024 KB        *
  Disk 1    Online           29 GB      0 B

DISKPART> sel disk 1

Disk 1 is now the selected disk.

DISKPART> clean

DiskPart succeeded in cleaning the disk.

DISKPART> create partition primary

DiskPart succeeded in creating the specified partition.

DISKPART> format fs=fat32

  100 percent completed

DiskPart successfully formatted the volume.

DISKPART>

DISKPART> assign

DiskPart successfully assigned the drive letter or mount point.

DISKPART> exit

Problem resolved. It is displaying 29.3 G memory space and usable.

Reference

1, Usb flash drive 8Gb is now only 1GB