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From: ballou@brahms (Kenneth R. Ballou)
Newsgroups: net.micro.pc
Subject: Re: Why does MS-DOS BACKUP introduce CHKDSK errors?
Message-ID: <247@cartan.Berkeley.EDU>
Date: Tue, 11-Nov-86 14:46:24 EST
Article-I.D.: cartan.247
Posted: Tue Nov 11 14:46:24 1986
Date-Received: Tue, 11-Nov-86 23:04:03 EST
References: <2233@ecsvax.UUCP>
Sender: daemon@cartan.Berkeley.EDU
Reply-To: ballou@brahms (Kenneth R. Ballou)
Distribution: na
Organization: Math Dept. UC Berkeley
Lines: 17
Keywords: backup, chkdsk, cross link, error

In article <2233@ecsvax.UUCP> unbent@ecsvax.UUCP (Jay F. Rosenberg) writes:
>
>...  I would have thought that making a backup involved only
>*reading* directories, not fiddling with them, so how did things get
>changed?

One of the attribute bits associated with a file is the 'archive' bit.  It
is set when a file is created or modified.  Its purpose is to indicate to
BACKUP any files changed since the last backup.  Hence, BACKUP clears this
bit as it churns (all right, crawls) along; this indeed involves writing
in directories (indirectly, using some DOS function).

--------
Kenneth R. Ballou		...!ucbvax!brahms!ballou
Dept. of Mathematics		ballou@brahms.berkeley.EDU
University of California
Berkeley, California  94720