Here is the how to do that:
If you have windows XP PC you can do this throug "Hyper Terminal"
Locate to "Hyper Terminal"
Start -> Programs -> Accessories -> Communications -> Hyper Terminal
Other wise (Win7\Vista) use Tera Term
How to use Hyper Terminal
1. Launch Hyper Terminal
2. In the Connection Description dialog box, enter a name and choose an icon you like for the connection. Then click the
3. Then you should see Connect To dialog box, In "connect using" choose your modem. Then click OK.
4. After that if you look main window of hyperterminal is like Note Pad.
5. Then you can paste the AT command there
AT COMMAND For HUAWEI Modem:
Disable Flash Drive:
if working properly then it should return OK
If your modem answers ERROR, instead you can use command:
PS: Please not that this command will disable the microSD-drive if availble on USB Modem also.
To Enable the flashdrive and the microSD-drive:
I have tested it on my Huawei E1550 and it worked perfectly.