Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucbvax!ucsfcgl!cca.ucsf.edu!wet!logic
From: logic@wet.UUCP (Henry Kwan)
Newsgroups: comp.sys.atari.st
Subject: Re: Hard Drive Speeds
Message-ID: <411@wet.UUCP>
Date: 13 Aug 89 10:12:37 GMT
References: <1275@blackbird.afit.af.mil> <29194@pbhya.PacBell.COM> <399@wet.UUCP> <676@opal.tubopal.UUCP>
Reply-To: logic@wet.UUCP (Henry Kwan)
Organization: Wetware Diversions, San Francisco
Lines: 26

In article <676@opal.tubopal.UUCP> alderaan@tubopal.UUCP (Thomas Cervera) writes:
>In article <399@wet.UUCP> logic@wet.UUCP (Henry Kwan) writes:
>
>>[...] Compare a ST506/412's
>>5Mbit/sec to something like an Imprimis 94181-702M's 15-24Mbit/sec (ain't
>>sure on this one but it's somewhere in that neighborhood).  The Imprimis
>>will just blow your socks off.
>
>  But doesn't the DMA bus limit such a speed if you solder it to an ST ?
>

True.  Then again, I'm of the school of thinking that overkill is better
than underkill.  The Imprimis drive will get something like 1,050K/sec on
ICD's RATEHD while the ST506/412 drive will get something like 300K/sec.
Real-life benchmarks are probably less glaring in difference but should
still be quite noticable.

I'm curious about the BMS-200 host adapter though.  They claim that it
supports a 1.6MB/sec transfer rate but I always thought that the ST's DMA
bus limit was 1.33MB/sec.  Or are they measuring it at the SCSI level?

-- 
           Henry Kwan - FWB, Inc.         |  "Experience varies directly
     claris!wet!logic@ames.arc.nasa.gov   |    with equipment ruined."
    cca.ucsf.edu!wet!logic@cgl.ucsf.edu   |
  {claris,ucsfcca,hoptoad,lamc}!wet!logic |              -- Tech Support