Windows 7: write protected pen drive

i have a 4gb pen drive which is not formatted it shows that "this disk is write protected "
can anyone help me to format this disk.

give this a shot:

1. click Start.

2. type in diskpart

3. wait for the black screen to apear, and type in "list disk"

4. find out which disk is your pen drive then type "select disk (pen drive number)"

5. type format.

try that and post results

Thanks

it is a scandisk 4gb pen drive.and when i try to format it a msg "this disk is write protected" is appeared.

And you did the steps above?

there are no effect on disk same problem is placed.

Try this:

a) Right-click on external hard drive and select properties in the explorer windows.
b) In the properties window, select the security tab.
c) Select the ‘user’ under user name and click on ‘Edit’.
d) In here you can ‘Allow’ or ‘Deny’ accessibility permission.

From: I need to remove write protection on a 4Gb SanDisk Cruzer Edge usb and - Microsoft Answers

no security tab is appear.
appeared tab is "general,tool,hardware,sharing,customize"

Is there a software that came with the disk?

Take that back, read some more and found this:

1. Open Start Menu
2. Run, type regedit and press Enter; this will open the registry editor
3. Navigate to the following path:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies
4. Double click the key WriteProtect in the right pane and set the value to 0 In the Value Data Box. Press OK
5. Exit Registry
6. Restart your computer and re-connect your USB pen drive on your computer.

Source: http://en.kioskea.net/faq/6984-remov...-from-pendrive

no there are no software

Did you try those steps?