Article View: comp.sys.ibm.pc.misc
Article #9777Re: When can you SYS a disk not originally formatted with /S?
From: Bob Eager
Date: Wed, 08 May 1991 09:44
Date: Wed, 08 May 1991 09:44
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In article <Ec8V7vK00awO06V0ZW@andrew.cmu.edu>, dj1l+@andrew.cmu.edu (Demian A. Johnston) writes:
> When the first set of sectors on the disk are empty. The Bootstrap
> MSDOS.SYS (IBMDOS.COM) IO.SYS (IBMBIO.COM) need to be the first items
> on the disk.
Not quite right:
a) The first two directory entries on the disk must be empty, so that the
first entry can be made IO.SYS (or IBMBIO.COM in the case of IBM and a
few other manufacturers) and the second entry can be MSDOS.SYS (or
IBMDOS.COM).
b) The MSDOS.SYS (IBMDOS.COM) file can go anywhere on the disk, and I don't
believe it has to be contiguous except perhaps for very early versions.
c) The first cluster of IO.SYS (IBMBIO.COM) has to be the first cluster in
the file space (cluster 2). Prior to DOS 3.3, the whole file had to be
contiguous; at DOS 3.3, the rest of the file is read in by the code in
that first cluster.
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Bob Eager | University of Kent at Canterbury
| +44 227 764000 ext 7589
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!crdgw1!uunet!mcsun!ukc!harrier.ukc.ac.uk!zodiac.ukc.ac.uk!cur022 From: cur022%cluster@ukc.ac.uk (Bob Eager) Newsgroups: comp.sys.ibm.pc.misc Subject: Re: When can you SYS a disk not originally formatted with /S? Message-ID: <22371.2827c86e@cluster@ukc.ac.uk> Date: 8 May 91 09:44:13 GMT References: <1991May3.191723.24131@midway.uchicago.edu> <Ec8V7vK00awO06V0ZW@andrew.cmu.edu> Organization: Computing Lab, University of Kent at Canterbury, UK. Lines: 24