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From: mark@gizzmo.UUCP (mark hilliard)
Newsgroups: comp.sys.att
Subject: Re: info on 7300 disk drives
Message-ID: <166@gizzmo.UUCP>
Date: Wed, 13-May-87 07:54:53 EDT
Article-I.D.: gizzmo.166
Posted: Wed May 13 07:54:53 1987
Date-Received: Sat, 16-May-87 02:36:38 EDT
References: <6485@mhuxu.UUCP> <1390@hou2d.UUCP> <506@unisec.usi.com>
Reply-To: mark@gizzmo.UUCP (mark hilliard)
Organization: GIZZMO, Walworth, NY
Lines: 43
Keywords: 7300 drives

>>Your 7300 diagnostic disc tells you all the acceptable types of
>>HD drives in the HD formatting menu. This includes a 67MB drive.

>The Unix PC will support a lot of different disk drives.  To get a partial
>list look in /usr/lib/iv.

Yes the pc will support a lot of drives. I recently put an 80 meg on my 
system (Micropolis 1325) and  a Wren II on a friends system.  The cables
are easy to make and install. You can purchase a Wren II from Software
Solutions for $950.00 with a 1 year warrenty. This drive will format
out to 62 meg due to the fact that it has 1 more head than the 7300
can handle.  The 1325 can be purchased for about $1200 and formats out
to 67 meg on the 7300. Both of these drives are voice coil heads with
36ms average access time. Beware of lower cost drives. Most including
Seagate are stepper motor drive for the heads and are noisy and slower.
The hard drive on any virtual memory system (7300) is the weakest point
in the system, and therefore the one item that you should pay more to get
a faster one. Look for a AVERAGE ACCESS TIME of 38 ms or LESS. Track to 
track time is meaningless if the average time is slower.  The last time
that I looked there were about 40 drives listed in the iv directory,
but you can install ANY SASI or SCSI drive on the 7300. 

Check with Amperfax on their 2 drives that they offer and ask about
speed and price, but dont forget about warrenty. Warrenty is more important
than price in my view. Amperfax gives TWICE the warrenty as ANYONE else.
If you want to go for a 80 meg (67 meg) drive, contact Software Solutions
about the Wren II (1 year warrenty), or look in byte for adds on the 1325.
The 1325 is the BEST 80 meg drive on the market (quality and speed) but it
is also the most expensive.  

There are several articles on the unix-pc.general newsgroup concerning drives
and installation of drives on the 7300, and one that actually gives step
by step instructions. Investigate joining this private news service and you
too can receive this information first hand. There are feeds all over the
country.  Contact me for information on how to access this private news
service.


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Mark Hilliard                                seismo!rochester!kodak!gizzmo!mark
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