SCSI drive management

Article View: comp.sys.mac

Article #7770

#7770

From: Chuck Hellier
Date: Tue, 14 Nov 1989 17:25

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1508 bytes

Does anyone know just how files are managed by the Mac OS?
Specifically, how does it decide to place a new file on a drive
(would the file be placed in the first open block, least recently
used, most recently used)?  Is the allocation method: _contiguous_,
_linked_, or _indexed_?  And how is the disk scheduled (FCFS, SSTF,
SCAN, ...)?

The reason I bring this up is: I know someone who has an SE (with an
Apple HD20) who had a file named "X" on his HD20 and a *different* file
named "X" on a floppy.  He copied the file "X" off of the floppy to
the HD20, "replacing" the file that was already there.  He needs to
recover the "X" that was originally on the HD20.

I'm already working on the recovery; don't need help with that.  I
just wanted to know if someone out there knew what happened (on the
hardware level) on his HD20.

Chuck Hellier (hellier@skat.usc.edu)		For you are young and life
PC Systems Programmer				is long and there is time
University of Southern California	 	to kill today.

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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!samsung!usc!skat.usc.edu!hellier
From: hellier@skat.usc.edu (Chuck Hellier)
Newsgroups: comp.sys.mac
Subject: SCSI drive management
Keywords: system, drive, scheduling
Message-ID: <21211@usc.edu>
Date: 14 Nov 89 17:25:44 GMT
References: <20618@unix.cis.pitt.edu>
Sender: news@usc.edu
Reply-To: hellier@skat.usc.edu (Chuck Hellier)
Organization: University of Southern California, Los Angeles, CA
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