Path: utzoo!attcan!uunet!husc6!rice!uw-beaver!cornell!rochester!pt.cs.cmu.edu!b.gp.cs.cmu.edu!ralf
From: ralf@b.gp.cs.cmu.edu (Ralf Brown)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Dos disk buffering schemes
Message-ID: <4110@pt.cs.cmu.edu>
Date: 25 Jan 89 16:52:11 GMT
References: <579@arisia.Xerox.COM>
Organization: Carnegie-Mellon University, CS/RI
Lines: 16

In article <579@arisia.Xerox.COM> leisner@arisia.Xerox.COM (Marty Leisner) writes:
}I'm using Aztec C 4.1b.  It seems the stdio routines reread the disk sector 
}after every fseek.  Fine.
}
}But it seems DOS goes to disk with every read.  What does BUFFERS= do in
}config.sys?  It doesn't seem to do much (DOS hits the disk every time it seems).

The buffers are used only for partial-sector reads and writes.  If you read
or write a complete sector, DOS transfers the data directly between the user
buffer and the disk.  Every MS-DOS "C" I've seen uses a buffer size of 512
bytes--exactly one disk sector.
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