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출처 : http://superuser.com/questions/818973/cannot-format-usb-flash-drive-everything-claims-its-write-protected

usb 메모리가 어느날 갑자기 정상적으로 읽히기도 않고 비정상적으로 반응하여 초기화를 위하여 포멧을 수행하여도 쓰기금지되어 있다고 하며 포멧도 되지 않는 경우에 

"attributes disk clear readonly" 명령을 수행해 보세요. 쓰기 속성을 지워서 포멧할 수 있도록 도와 줍니다.

C:\WINDOWS\system32>diskpart

Microsoft DiskPart version 6.3.9600

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

DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
  Disk 0    Online          931 GB  1024 KB
  Disk 1    No Media           0 B      0 B
  Disk 2    No Media           0 B      0 B
  Disk 3    No Media           0 B      0 B
  Disk 4    No Media           0 B      0 B
  Disk 5    No Media           0 B      0 B
  Disk 6    Online         3824 MB      0 B

DISKPART> select disk 6

Disk 6 is now the selected disk.

DISKPART> attributes disk clear readonly

Disk attributes cleared successfully.

DISKPART> clean

DiskPart has encountered an error: Incorrect function.
See the System Event Log for more information.

DISKPART> create partition primary

DiskPart succeeded in creating the specified partition.

DISKPART> format fs=fat32

    0 percent completed

Virtual Disk Service error:
The media is write protected.


DISKPART> exit

Leaving DiskPart...

C:\WINDOWS\system32>