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Article #2705

Re: ICD's RateHD and ST251 access times

#2705
From: Jared Brennan
Date: Sun, 30 Jul 1989 17:52
28 lines
2216 bytes
In article <2160@jhunix.HCF.JHU.EDU> I write:
>     I've been having major speed problems with my ST251 drive (installed
>in place of the Tandon 263 20Mb mechanism in my SH204).  Like, it's really
>slow, you know?  Being too lazy to do anything about it, I waited a month,
>then reformatted the drive.  Before the reformat, the drive was interleaved
>1:1, and returned a 383Kb/s transfer rate and 448ms access time using the
>RATEHD program from ICD.  After the reformat, at interleave 1:3 (or 3:1),
>the transfer rate was 161Kb/s and 443ms access time.  Hmmm...
> [questions deleted]

     Well, having nothing better to do after having taking all the software
off my hard drive, I kept reformatting it and varying the parameters each
time.  When I changed the step pulse rate from its default value of 0 to 1
(or 2, or 3, or 4) in the Supra formatter, lo and behold!  The access time
dropped to 34ms.  (As a side note, it was my impression that the drive was
an ST251-0, 40ms access time.  Looks like it's a ST251-1, rated 28ms.
Gosh, and here I was thinking I had paid a good price for an ST251-0...)
(-8   (-8   (-8   (-8   (-8   (-8   8-)   8-)   8-)   8-)   8-)   8-)
^^^ Did I mention that I was happy about this state of affairs? ^^^

     Anyway, I would like to thank those of you who have sent replies to
my request for help.  Don't worry, next time I'll have a real humdinger
for you, promise!  8-)

-- 
Jared Brennan <ins_bjjb@jhunix.hcf.jhu.edu>	BITNET: INS_BJJB@JHUNIX,JHUVMS
ARPA: ins_bjjb%jhunix@hopkins.ARPA	UUCP: allegra!hopkins!jhunix!ins_bjjb
"How many pins could one stick in the head of an angel?"
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!ginosko!aplcen!jhunix!ins_bjjb
From: ins_bjjb@jhunix.HCF.JHU.EDU (Jared Brennan)
Newsgroups: comp.sys.atari.st
Subject: Re: ICD's RateHD and ST251 access times
Summary: Aha!  Step pulse rate does make a difference!
Keywords: ICD RATEHD Seagate ST251 access time
Message-ID: <2162@jhunix.HCF.JHU.EDU>
Date: 30 Jul 89 17:52:01 GMT
References: <2160@jhunix.HCF.JHU.EDU>
Reply-To: ins_bjjb@jhunix.UUCP (Jared Brennan)
Distribution: usa
Organization: The Johns Hopkins University - HCF
Lines: 28