+ Post New Thread
Results 1 to 10 of 10
  1. #1
    Full Member level 4
    Points: 1,727, Level: 9

    Join Date
    Jul 2012
    Posts
    199
    Helped
    11 / 11
    Points
    1,727
    Level
    9

    Usb pen-drive moddification for write protection

    Hi all friends please help me -- i want to write protect a pen drive by means of circuit. any help is greatly thankfull .

  2. #2
    Advanced Member level 1
    Points: 3,034, Level: 12

    Join Date
    May 2012
    Posts
    438
    Helped
    97 / 97
    Points
    3,034
    Level
    12

    Re: Usb pen-drive moddification for write protection

    Most USB pen controllers have a pin on them to write protect the drive. You will need to find the data for your particular pen drive controller.



    •   Alt6th September 2012, 13:24

      advertising

        
       

  3. #3
    Full Member level 4
    Points: 1,727, Level: 9

    Join Date
    Jul 2012
    Posts
    199
    Helped
    11 / 11
    Points
    1,727
    Level
    9

    Re: Usb pen-drive moddification for write protection

    it doesn't have pin for doing so ..



  4. #4
    Full Member level 1
    Points: 1,604, Level: 9

    Join Date
    Nov 2011
    Location
    india
    Posts
    109
    Helped
    26 / 26
    Points
    1,604
    Level
    9

    Re: Usb pen-drive moddification for write protection

    open pen drive case, check which controller ic is used then search ic pin details on the net. Find W/P pin and check it is low active or high active
    Quote Originally Posted by peter_england View Post
    it doesn't have pin for doing so ..



    •   Alt8th September 2012, 13:21

      advertising

        
       

  5. #5
    Full Member level 4
    Points: 1,727, Level: 9

    Join Date
    Jul 2012
    Posts
    199
    Helped
    11 / 11
    Points
    1,727
    Level
    9

    Re: Usb pen-drive moddification for write protection

    thanks ,
    i will check it but please clear the low active and high active thing,, what is mean of that and how to test that two signals (if they are signals)?? thanks kamal .



  6. #6
    Full Member level 1
    Points: 1,604, Level: 9

    Join Date
    Nov 2011
    Location
    india
    Posts
    109
    Helped
    26 / 26
    Points
    1,604
    Level
    9

    Re: Usb pen-drive moddification for write protection

    yess these are two signals. Check ic datasheet and working logic voltage of ic. e.g. if ic logic is 3.3v and then check ic W/P pin is high active or low active on datasheet , if high active then jump 3.3v on W/P pin.
    Quote Originally Posted by peter_england View Post
    thanks ,
    i will check it but please clear the low active and high active thing,, what is mean of that and how to test that two signals (if they are signals)?? thanks kamal .
    - - - Updated - - -

    yess these are two signals. Check ic datasheet and working logic voltage of ic. e.g. if ic logic is 3.3v and then check ic W/P pin is high active or low active on datasheet , if high active then jump 3.3v on W/P pin.
    Quote Originally Posted by peter_england View Post
    thanks ,
    i will check it but please clear the low active and high active thing,, what is mean of that and how to test that two signals (if they are signals)?? thanks kamal .



  7. #7
    Advanced Member level 5
    Points: 11,570, Level: 25
    Achievements:
    7 years registered

    Join Date
    Apr 2010
    Posts
    1,770
    Helped
    385 / 385
    Points
    11,570
    Level
    25

    Re: Usb pen-drive moddification for write protection

    thanks for the info on write protection pin available in usb controllers.

    Then why no pendrive manufacturer give the wr protection switch in any of their models?( i mean an external switch , like a tab on older floppy discs)

    AFAIK i have not seen any pendrive with the switch.( very earlier pendrives , some 32MB have a switch.)

    A model without switch, helps virus writers .

    If any of the members know any pendrive model with WR protect switch , please give their names.



  8. #8
    Full Member level 4
    Points: 1,727, Level: 9

    Join Date
    Jul 2012
    Posts
    199
    Helped
    11 / 11
    Points
    1,727
    Level
    9

    Re: Usb pen-drive moddification for write protection

    I am also searching that but not found so i dive in the circuit actually i want it for generic day to day support and does not wish the pen drive is get infection >>
    Quote Originally Posted by srizbf View Post
    thanks for the info on write protection pin available in usb controllers.

    Then why no pendrive manufacturer give the wr protection switch in any of their models?( i mean an external switch , like a tab on older floppy discs)

    AFAIK i have not seen any pendrive with the switch.( very earlier pendrives , some 32MB have a switch.)

    A model without switch, helps virus writers .

    If any of the members know any pendrive model with WR protect switch , please give their names.



  9. #9
    Advanced Member level 5
    Points: 33,525, Level: 44
    Achievements:
    Created Album pictures Created Blog entry 7 years registered
    tpetar's Avatar
    Join Date
    Sep 2010
    Location
    Pancevo-Belgrade, Serbia
    Posts
    6,427
    Helped
    1731 / 1731
    Points
    33,525
    Level
    44

    Re: Usb pen-drive moddification for write protection

    Lots of first models of USB pen driver have small write protection switch. My first pen drive have 16MB in size works even today and have that small switch.

    Just pay attention when buying, you can find in shop with write protection. Dont argue with sellers they 99% dont know what you talking, just look for that small switch.

    List of USB Flash Drives with Hardware Write Protection
    http://www.fencepost.net/2010/03/usb...te-protection/
    “Let the future tell the truth, and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have really worked, is mine.” Nikola Tesla



    •   Alt9th September 2012, 18:43

      advertising

        
       

  10. #10
    Full Member level 4
    Points: 1,727, Level: 9

    Join Date
    Jul 2012
    Posts
    199
    Helped
    11 / 11
    Points
    1,727
    Level
    9

    Re: Usb pen-drive moddification for write protection

    thanks kamal,, i found that the controller is ALCOR AU 6982 and the w/p pin is No.22 and its High active said in the datasheet.

    - - - Updated - - -

    Thanks tpeter for info >>


    1 members found this post helpful.

--[[ ]]--