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From: phil@brahms.amd.com (Phil Ngai)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: EISA Disk Controllers
Message-ID: <1991Feb6.234832.10103@amd.com>
Date: 6 Feb 91 23:48:32 GMT
References: <43779@ut-emx.uucp>
Sender: usenet@amd.com (NNTP Posting)
Organization: Advanced Micro Devices, Inc; Sunnyvale, CA
Lines: 16

In article <43779@ut-emx.uucp> solomon@chaos.utexas.edu (Thomas Solomon) writes:
|Does anyone know the scoop about these controllers?  Specifically, how
|fast can they write to disk in a _continuous_ mode.  We are interested

The question is how fast is their disk interface? ST-506, for example
is only 5 megabits per second. ESDI is 10, 15 or maybe 20 mbs.  IDE and
SCSI get around this to some extent by putting a controller on the
drive, but you still have a serial path from the read/write heads and
the same issues apply except that you get to use Zone Bit Recording.
Some are also cranking up the spindle speed to 4400 RPM. Even so, the
highest bit rate I've seen is 25 megaBITs/second (and this only on the
outer most cylinders). So your CONTINUOUS 4 megabyte/second seems very
unlikely.

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