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Windows Thread, Disable F8 Now!!! in Technical; Disable bootdelay ie bootdelay=0 How do I decrease the boot delay? This used to be the way in windows 9x ...
  1. #46

    mac_shinobi's Avatar
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    Disable bootdelay ie bootdelay=0

    How do I decrease the boot delay?

    This used to be the way in windows 9x using the msdos.sys file + notepad and adding the bootdelay command

    would be good to know how nosafemode achieves the disabling of the F8 key or F keys in general

    if you re map the scan codes for the relevant F keys would that make any difference :

    http://vlaurie.com/computers2/Articl...p-keyboard.htm
    Last edited by mac_shinobi; 17th March 2011 at 07:31 AM.

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    Quote Originally Posted by mac_shinobi View Post
    Disable bootdelay
    In Windows Vista & 7, you can disable the boot menu entirely with bcdedit /set {bootmgr} displaybootmenu no. However, I haven't had a chance to see if this disables F8 too - it might.

    Quote Originally Posted by mac_shinobi View Post
    would be good to know how nosafemode achieves the disabling of the F8 key or F keys in general
    I should have mentioned in my previous post that NoSafeMode also adds some code to the MBR (at the offsets below). I think it is this which does the actual disabling of the keys.

    Code:
    0x1b=27 to 0x8b=139 (113 bytes)
    0x8d=141 to 0x93=147 (7 bytes)
    Quote Originally Posted by mac_shinobi View Post
    If you remap the scan codes for the relevant F keys would that make any difference.
    Unfortunately not. It would happen too late in the boot process.

  3. 3 Thanks to Arthur:

    mac_shinobi (17th March 2011), ptotham (19th May 2011), timbo343 (21st March 2013)

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    Hi

    You may be able to achieve this on Win 7 (certain editions and if the hardware requirements are met).

    Read BitLocker Drive Encryption Technical Overview

    Recovery password
    The recovery password is a 48-digit, randomly-generated number that can be created during BitLocker setup. If the computer enters recovery mode, the user will be prompted to type this password using the function keys (F0 through F9). The recovery password can be managed and copied after BitLocker is enabled. Using the BitLocker control panel, the recovery password can be printed or saved to a file for future use.

    Sukh

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    kennysarmy's Avatar
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    Quote Originally Posted by Arthur View Post

    I should have mentioned in my previous post that NoSafeMode also adds some code to the MBR (at the offsets below). I think it is this which does the actual disabling of the keys.

    Code:
    0x1b=27 to 0x8b=139 (113 bytes)
    0x8d=141 to 0x93=147 (7 bytes)
    (
    Can I ask what file this is in and what app you used to open the file?

    Cheers

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    Quote Originally Posted by kennysarmy View Post
    Can I ask what file this is in and what app you used to open the file?

    Cheers
    MBR ( Master Boot Record ) on the hard drive itself and viewed / edited it using a hex editor afaik

    hex editor - Google Search

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    Quote Originally Posted by Arthur View Post
    In Windows Vista & 7, you can disable the boot menu entirely with bcdedit /set {bootmgr} displaybootmenu no. However, I haven't had a chance to see if this disables F8 too - it might.
    Would be good to know if this gets around the F8 thing, if so then on xp or similar OSes you could deny permissions for student / teacher groups to boot.ini or similar files.

    Also on windows 7 where it is different as per the command you posted bcdedit /set {bootmgr} displaybootmenu no

    does this also edit / ammend a boot.ini file or what does this command do exactly ?

    ie changing registry entries or what exactly ?

    could be wrong but that's how I think Arthur has done it
    Last edited by mac_shinobi; 17th March 2011 at 12:55 PM.

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    Quote Originally Posted by kennysarmy View Post
    Can I ask what file this is in and what app you used to open the file?
    The master boot record is located in the first 512 sectors of your hard drive. As mac_shinobi mentioned it is not visible as a file inside your operating system, but you can use a hex editor to view it.

    I used HxD since it has the ability to modify disks (like WinHex) but is free. To see the changes NoSafeMode made, I did a backup of the MBR before and after I ran the program and then compared the differences. However, without knowledge of assembly language there's probably not much that can be done to find out how it functions. I assume it works like mbldr, but can bypass NTDLR to boot Windows.

  9. Thanks to Arthur from:

    mac_shinobi (17th March 2011)

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    Thumbs up Disable Safe Mode command line tool

    Hello to everyone. I don't really like to post on forums but I couldn't help myself when I saw that you are also trying to solve F8 nightmare with registry modifications.

    I tried literally everything to disable safe mode on my Windows 7 computer until I have found Disable Safe Mode – Microsoft Windows Command Line Tool

    I was focusing on F8 key and now I realize that there are many other ways to break boot process and enter into computer system.
    The tool can be run only with admin rights so there is no need for any additional password, especially if it is stored in MBR.

    I hope this post will help someone out there ...

  11. #54

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    Quote Originally Posted by -cory- View Post
    Hello to everyone. I don't really like to post on forums but I couldn't help myself when I saw that you are also trying to solve F8 nightmare with registry modifications.

    I tried literally everything to disable safe mode on my Windows 7 computer until I have found Disable Safe Mode – Microsoft Windows Command Line Tool

    I was focusing on F8 key and now I realize that there are many other ways to break boot process and enter into computer system.
    The tool can be run only with admin rights so there is no need for any additional password, especially if it is stored in MBR.

    I hope this post will help someone out there ...
    Sounds more like a bad attempt at advertising if I'm totally honest

    It's not about disabling F8, just thats what loads the boot menu normally...

    All that program does is edit a file, you can already edit for free, and change all of 1 line.

    And it disables it "while windows is running", so to quote the website "All system modifications made by DisableSafeMode are completely reversible so you will be able to stop the protection in case you need to do so (eg. you need to repair the computer)"

    Not really true if you need Safemode etc, as you can't get into windows in the first place :P "No-one" being able to access Boot Menu, isn't really anymore help than just totally breaking it, If you need to Boot windows to access it to get back into it for proper admin stuff.

    Charging £70~ for "Business" version of a 1 line piece of code?

    Nice...

    Steve
    Last edited by Steve21; 13th April 2011 at 09:37 PM.

  12. Thanks to Steve21 from:

    greenfieldsupport (18th January 2013)

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    I don't know how many lines of code it has and I don't care.
    I couldn't find that one free line so I end up with this.
    I've also tried some other “free” solutions and tools which disables keyboard and mess with MBR so I really don't see the difference.

    Take care

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    Quote Originally Posted by -cory- View Post
    I couldn't find that one free line so I end up with this.
    You could have saved yourself some money if you used...

    Code:
    bcdedit /set {bootmgr} displaybootmenu no

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    Fortunately for me, that one line can only make some unwanted features to my OS.

    By entering bcdedit /set {bootmgr} displaybootmenu no you will remove operating system selection menu and you will not be able to use secondary OS (if any.)
    You will also be able to start your current OS in safe mode on several ways, or start system repair process...

    As I can confirm, Disable Safe Mode allows me to select secondary OS...so it is obviously something more than one line of code.

    Regards

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    Quote Originally Posted by Arthur View Post
    In Windows Vista & 7, you can disable the boot menu entirely with bcdedit /set {bootmgr} displaybootmenu no. However, I haven't had a chance to see if this disables F8 too - it might.


    I should have mentioned in my previous post that NoSafeMode also adds some code to the MBR (at the offsets below). I think it is this which does the actual disabling of the keys.

    Code:
    0x1b=27 to 0x8b=139 (113 bytes)
    0x8d=141 to 0x93=147 (7 bytes)

    Unfortunately not. It would happen too late in the boot process.

    thanks for this work a treat for what i wanted.

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    Disable SafeMode, F8 and boot to repair

    bcdedit /enum all /v >bcd.txt (needed for last command)

    bcdedit /set {default} bootstatuspolicy ignoreallfailures
    bcdedit /set {9dea862c-5cdd-4e70-acc1-f32b344d4795} displaybootmenu No
    bcdedit /set {default} recoveryenabled No
    bcdedit /set {e3a1b7b2-4f95-11e2-bdf3-8ca6f71a339d} winpe no

    now reboot! (its a MUST)

    the segment in red is unique to the image used (windows install), check the txt file created on first command.


    This was long overdue for me to post. I hope this was more clearly stated and helps someone in the future.

    Credit to the EduGeek community.

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