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- Path: sparky!uunet!gatech!news.ans.net!cmcl2!acf5!liuyu
- From: liuyu@acf5.NYU.EDU (liuyu)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: WD Caviar 2200 slow?
- Message-ID: <2134@acf5.NYU.EDU>
- Date: 21 Jan 93 20:42:21 GMT
- References: <2129@acf5.NYU.EDU> <1993Jan21.152049.4508@ultb.isc.rit.edu>
- Organization: New York University
- Lines: 30
-
- ajb8886@ritvax.isc.rit.edu writes:
-
- >Also note that the "CMOS" drive configuration (what the computer THINKS the
- >drive is configured as) and what the drive is ACTUALLY configured as (due to
- >"translation"), the test may be actually spanning multiple cylinders depending
- >on the data on the drive is organized. In such a case you would have more
- >overhead due to the head repositioning (which the diagnostics program "thinks"
- >is not occurring due to sector translation).
-
- I used the parameters on the label of this drive. It has 989 cyl., 12 head,
- and 35 sector/trk. Now come to think of it. It is unlikely to have 6
- platers (12 heads) in this 1" height drive. The *actual* geometry of this
- drive probably has 2 or 3 plater, more cylinders, and more sectors on outer
- tracks and less on inner. I guess total # of sectors is the same for both
- the parameter on the label and the *actual* parameter. Am I right?
-
- >Moral of the story: Do not rely on disk benchmarks too heavily, as the way
- >they are measured can sometimes give widely varying results (particularly with
- >the use of on-drive hardware caches).
-
- I got ya.
-
- >Yes. Try a recent version of CORE test. It's pretty consistent ALTHOUGH it
- >sometimes gets confused by caching and reports very high performance (but
- >misleading) figures with some caches enabled.
-
- I just tried CORE test (v 2.92) I found on wuarchive. It showed 1.89 meg/s.
- Amazingly different... Maybe this version is too old. It is dated 1990.
-
- Anyway, thanks for the detailed reply!
-