How to erase encrypted usb drive it wont let me format it

[Manoj121]

HI last year i bought a pendrive which contain lectures which are useful for my examination.Data in the pendrive is in the form of files.After 1 year it has expired.It is of 30gb. I want to use it as normal pendrive by erasing files in it. But i am not able to erase it.I used diskpart also it didnt work.Can somebody please provide solution how to do it.

 

[Saga Lout]

Right click the drive and go to Properties then click the Security tab. Check the Permissions and edit them if they don't include you.

You may need an administrative account or invoke the System Administrator account to do it for you..

 

[Manoj121]

But there is no security tab option when i see properties.