boot from drives and format

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  1. Posts : 1,557
    XP, Seven, 2008R2

    Antman said:
    You can format the C drive at that time.

    Am I missing something?
    Maybe, I'm not sure, but I think he cannot format the C: drive because that is the drive his current version of Windows is running from. You know, you cannot format the C: drive while you're booted into Windows and you cannot install to a partition that doesn't have enough free space.

    What he can do is follow a procedure similar to the following, but instead of using a USB flash drive, just use your D: partition and make it active using disk management or diskpart.

    Install Windows Vista (or 7) from Bootable USB Flash Memory Drive

    EDIT: It does work nicely, even when using internal hard disks as the install media. I just tried it, and it's fast. Like I say, I only had to adopt the method above to use my internal hard disk rather than a USB one. (Be careful or you could end up doing bad things to your current partition structure...ultimately creating a big headache for yourself, especially if it causes you to lose important data!)

    To recap: Basically all you really need to do is set your D: partition as active and then go into your BIOS and make the hard disk including the D: partition as the first boot device (it probably already is). If you need any more help, just let me know.

    WARNING: Techie Explanation:
    The reason this works is because copying the installation files from the Win7 DVD to hard disk also copies the boot manager and boot code that was included on the install media. However it will NOT do anything to the hard disk's Master Boot Record, so the boot code in the MBR must already be in place [as it should be so long as the disk was already partitioned with Windows Vista or higher]). This is a nice feature and it didn't used to work pre-Vista days. I hope this was not too much information
    Last edited by sup3rsprt; 23 Aug 2009 at 02:46.
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  2. Posts : 133
    Thread Starter

    thanks dear i need some more explanation.

    my bios first boot device options are these:


    Intel UNDI,
    USB FDD,
    USB HDD,

    which one is used fro this?
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  3. Posts : 1,557
    XP, Seven, 2008R2

    If the D: partition is on the same hard drive as C: then you don't need to change the boot order. You only need to make the D: partition active using disk management or diskpart

    Once you get Windows installed you might need to set C: drive as active again. You can do that using the diskpart tool on the install media.
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  4. Posts : 133
    Thread Starter

    no its not happening ...
    this error occurs when i try to make partition active
    Virtual Disk Service error:
    The specified partition type is not valid for this operation.
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  5. Posts : 1,557
    XP, Seven, 2008R2

    Microsoft said:
    You cannot make a logical drive or an extended partition active. Only a primary partition can be made active.
    Mark a partition as active - Windows Vista Help

    I think it's time for a new DVD drive. :P

    Either that or find some utility that lets you convert an extended/logical partition into a primary partition. I use Acronis Disk Director. Maybe you can find a free one that works with Windows.
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  6. Posts : 1,112
    XP_Pro, W7_7201, W7RC.vhd, SciLinux5.3, Fedora12, Fedora9_2x, OpenSolaris_09-06

    sup3rsprt said:
    find some utility that lets you convert an extended/logical partition into a primary partition.
    Caution here !!

    Marking a partition as active is an advanced task that should only be performed by advanced users.
    Do not mark a partition as active if it does not contain the loader for an operating system. Doing so will cause your computer to stop working.
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  7. Posts : 133
    Thread Starter

    Now i borrowed DVD+RW from one of my friend.
    i tried hard from doing it and burn the ISO from IMgBUrn on that DVD.
    but same problem is occured again.
    help me ? , i remebered when i tried in winXP to boot a CD then it was booting. but why now not booting from any device, this time?
    i tried it from USB, DVD + RW but having no effect.

    " Disk Read-Error Occured, Press Ctrl+Alt+Del".
      My Computer

  8. Posts : 1,557
    XP, Seven, 2008R2

    right after you turn the PC on, press the key that the screen says to press in order to change the boot option. Then select the DVD drive and press Enter.

    Or go into the BIOS and select the DVD drive as the first boot device.
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  9. Posts : 143
    windows 7 rtm ultimate build 7600 x86


    do u want to format and install windows 7 in ur c drive by booting from ur hard drive??
    1st tell me do u have d bootable iso file in ur d rive???
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  10. Posts : 133
    Thread Starter

    i did it too sober.
    i know . but except this message, it didnt do anything.

    yes scropio , if you can help me then please.
      My Computer

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