Re: 8/1551 Re: Why Re: Why no third party solutions?

[John Kim <jokim@uni.uiuc.edu>]

On Fri, 21 Oct 1994, Robert George wrote:

> Consider the Sigma Data drives which have a buffer-to-host transfer rate
                                              ^^^^^^^^^^^^^^
> of 6 _Megabytes_ /sec trying to transfer data over the 960 _Kilobytes_ /sec
> of the EPP port.  You essentially have a 600% overhead on all traffic
> going to the ThinkPad.

Buffer-to-host transfer rate, not disk-to-host transfer rate.  Most drives
can't read off the disk faster than 1MB/sec.  So you'll only suffer the
600% overhead for a fraction of a second.  Unless of course if you've got
a 6MB cache built into the hard drive, in which case it could last a full
second. 

The advantage of SCSI's bandwidth is more apparent when you have multiple
devices hanging off the same SCSI chain.
--
John H. Kim
jokim@mit.edu