Path: utzoo!utgpu!watmath!clyde!att!pacbell!lll-tis!helios.ee.lbl.gov!pasteur!camelot!jdi
From: jdi@camelot..Berkeley.EDU (John Irwin)
Newsgroups: comp.sys.next
Subject: Re: two passes to write file? (was: Lousy input sound)
Message-ID: <7592@pasteur.Berkeley.EDU>
Date: 20 Nov 88 08:54:22 GMT
References: <25795@tut.cis.ohio-state.edu> <898@accelerator> <8711@spl1.UUCP> <4301@phoenix.Princeton.EDU> <900@paris.ics.uci.edu>
Sender: news@pasteur.Berkeley.EDU
Reply-To: jdi@camelot.Berkeley.EDU (John Irwin)
Organization: University of California at Berkeley
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In article <900@paris.ics.uci.edu> nagel@paris.ics.uci.edu (Mark Nagel) writes:
+In article <4301@phoenix.Princeton.EDU>, zimerman@phoenix (Jacob Ben-david Zimmerman) writes:
++
++...okay, ignorant question here...I read earlier on that during writes,
++the optidrive does TWO passes, one to zero the fields, and one to write
++in the 'one' state bits.  Now, since it has to do two passes and needs
++...
+
+...
+are concerned with.  The disk will do passes for each *block* it
+writes to disk.
+...

Actually I heard from a very reliable source that it takes three passes to
write a block.  Thus reading is three times as fast as writing.  The source
also quoted the read speed as being something close to 900kB/s.  (using the
new nomenclature :-)

	-- John