l i n u x - u s e r s - g r o u p - o f - d a v i s
Next Meeting:
July 7: Social gathering
Next Installfest:
Latest News:
Jun. 14: June LUGOD meeting cancelled
Page last updated:
2004 Sep 24 12:53

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

Report this post as spam:

(Enter your email address)
Re: [vox-tech] rescuing winxp?
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [vox-tech] rescuing winxp?

On Fri, 24 Sep 2004, Rick Moen wrote:

> That is correct.  SYS.COM copies several files (io.sys, command.com,
> msdos.sys, and at least one other that I've mercifully forgotten about)
> with the read-only, hidden, and system flags set, to the indicated FAT
> filesystem.  One of those gets written to a specific physical location
> so as to be findable by the Int13h boot service, early in the boot
> process

Starting at some DOS version, the physical location thing became no longer
necessary.  I'm not sure which version but somewhere around DOS 4-ish.
Apparently the DOS bootstrap code became smarter and figured out ways to
search for those files in the FS.  As a consequence, the "system" flag on
those system files (which tells the OS and utility tools like Norton and
PC Tools not to move those files from their physical location) no longer
became necessary as they were before.

To re-install the MBR, another important component for booting DOS and
Windows, uses FDISK's *undocumented* flag:


Once I told someone to do that over the phone and he freaked out (because
"FDISK is dangerous!")  I'm not sure if he had the guts to go through with


Mark K. Kim
AIM: markus kimius
Homepage: http://www.cbreak.org/
Xanga: http://www.xanga.com/vindaci
Friendster: http://www.friendster.com/user.php?uid=13046
PGP key fingerprint: 7324 BACA 53AD E504 A76E  5167 6822 94F0 F298 5DCE
PGP key available on the homepage
vox-tech mailing list

LUGOD Group on LinkedIn
Sign up for LUGOD event announcements
Your email address:
LUGOD Group on Facebook
'Like' LUGOD on Facebook:

Hosting provided by:
Sunset Systems
Sunset Systems offers preconfigured Linux systems, remote system administration and custom software development.

LUGOD: Linux Users' Group of Davis
PO Box 2082, Davis, CA 95617
Contact Us

LUGOD is a 501(c)7 non-profit organization
based in Davis, California
and serving the Sacramento area.
"Linux" is a trademark of Linus Torvalds.

Sponsored in part by:
EDGE Tech Corp.
For donating some give-aways for our meetings.