No, you can't format the system drive while its in use. Boot from your XP CD and run setup from there. As part of setup, you'll be given the option to format the drive. Once the drive is formatted, simply stop setup.

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Doug Knox, MS-MVP Windows Media Center\Windows Powered Smart Display\Security
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Hi Doug
This sounds great; just need a little clarification. I asume that the
qualification is that the new drive is installed or is this with the old
drive and the new drive in place? Please explain the the logistics a little
more. Thanks.
> No, you can't format the system drive while its in use. Boot from your XP CD and run setup from there. As part of setup, you'll be given the option to format the drive. Once the drive is formatted, simply stop setup.
>
[quoted text clipped - 5 lines]
> > better job than formatting? Any suggestions will be gratefully appreciated.
> > Thanks.
Harry Ohrn - 31 Aug 2005 05:09 GMT
check my post in your thread

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Harry Ohrn MS-MVP [Shell/User]
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> Hi Doug
> This sounds great; just need a little clarification. I asume that the
[quoted text clipped - 20 lines]
>> > appreciated.
>> > Thanks.
Doug Knox MS-MVP - 31 Aug 2005 05:33 GMT
This would be with the old drive, only installed. After the process is complete, remove the old drive, install the new drive and boot from the CD again, and run setup to do the full installation.

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Doug Knox, MS-MVP Windows Media Center\Windows Powered Smart Display\Security
Win 95/98/Me/XP Tweaks and Fixes
http://www.dougknox.com
--------------------------------
Per user Group Policy Restrictions for XP Home and XP Pro
http://www.dougknox.com/xp/utils/xp_securityconsole.htm
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Please reply only to the newsgroup so all may benefit.
Unsolicited e-mail is not answered.
> Hi Doug
> This sounds great; just need a little clarification. I asume that the
[quoted text clipped - 11 lines]
>> > better job than formatting? Any suggestions will be gratefully appreciated.
>> > Thanks.