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1994-01-18
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Path: menudo.uh.edu!usenet
From: andrey@ugcs.caltech.edu (Andre Yew)
Newsgroups: comp.sys.amiga.reviews
Subject: REVIEW: Seagate ST3655N SCSI hard drive
Followup-To: comp.sys.amiga.hardware
Date: 1 Jan 1994 19:07:53 GMT
Organization: The Amiga Online Review Column - ed. Daniel Barrett
Lines: 239
Sender: amiga-reviews@math.uh.edu (comp.sys.amiga.reviews moderator)
Distribution: world
Message-ID: <2g4hm9$gjc@menudo.uh.edu>
Reply-To: andrey@ugcs.caltech.edu (Andre Yew)
NNTP-Posting-Host: karazm.math.uh.edu
Keywords: hardware, SCSI, hard drive, technical, commercial
PRODUCT NAME
Seagate ST3655N SCSI hard drive
[MODERATOR'S NOTE: This review was updated on Jan 18, 1994.
Search for the text "[UPDATE:" to find updated information.
-Dan]
BRIEF DESCRIPTION
The ST3655N is a 540-megabyte SCSI hard drive that formats
to 519 MB.
AUTHOR/COMPANY INFORMATION
Name: Seagate Technology, Inc.
Address: 920 Disc Drive (really, that's the name)
Scotts Valley, CA 95066
USA
Telephone: (408) 438-8222
FAX: (408) 438-2620
LIST PRICE
The list price is well over $1000 (US), but it's irrelevant to the
actual street price. I paid $621 with Federal Express standard overnight
shipping from Hard Drives International, a mail order company that
advertizes in Computer Shopper.
SPECIAL HARDWARE AND SOFTWARE REQUIREMENTS
HARDWARE
You need a SCSI host adapter.
SOFTWARE
None.
MACHINE USED FOR TESTING
Amiga 3000/25, with 2 MB of Chip RAM and 8 MB of Fast RAM. This
machine has the PROTO version of the Western Digital 33C93 SCSI chip.
Softkicked version 37.175 Kickstart, and version 38.35 Workbench.
Original 52 MB Quantum hard drive, cached with HyperCache Pro.
XFH 1.3 filesystem compression used on several directories.
INSTALLATION
The hard drive was very easy to install. This is covered in more
detail in the review, since installing a drive is half of buying and using
one.
DISCLAIMER: I wrote this review mostly as a guide for people who
wanted to install hard drives in their A3000s. However, remember that you
are dealing with CMOS devices and you should properly ground yourself before
touching the drive or opening up your computer. This means you should
either wear a grounding strap connected to ground, or touch the case of your
power supply or another grounded metallic object periodically when you
work. If you damage anything because of this review, it's your fault for
not preparing adequately.
Also be aware that Commodore might still take a dim view of people
opening up their computers, and might cancel your warranty because of it.
This happened to me, so it can happen.
REVIEW
I decided to move out of the Dark Ages of computing recently when I
bought a new hard drive to supplement the A3000's original 52 MB Quantum
drive. I decided that I was going to do this right, since it was the only
upgrade I was going to do for a while. With that goal in mind, I wanted a
big and fast drive. What I ended up with was certainly big --- half a
gigabyte --- but not the fastest drive in its class.
I purchased the drive through mail order from Hard Drives
International. They were courteous and helpful, but a little clueless. I
asked that the drive be shipped to my office, but instead it was shipped to
my home. Perhaps it was because I caught them right before Christmas.
Anyway, the drive arrived, and I had it installed and running in less than
20 minutes. Here's what I did.
[MODERATOR'S NOTE: If you are not comfortable opening up your
Amiga, then you should have the work done by an authorized Amiga
service center. Opening your Amiga yourself may void your warranty,
and careless work may even damage the machine. - Dan]
First, I read the documentation, which is extremely biased towards
PC clones with its DOS setup section and all. The most important part of
the documentation is the section explaining the jumpers. The are two things
that need to be configured on the drive: the SCSI ID number and the
termination. Every SCSI device on the same wire must have a unique SCSI
ID. Since the Quantum already had ID #6, and host controllers tend to have
ID #7, I picked 5. Next, since I was not using the drive in Fast SCSI mode,
I picked passive termination. The jumpers for the termination blocks were
stubborn and could be removed only by a very fine pair of pliers.
That done, I had to reconfigure the Quantum. Because of transmission
line effects, the SCSI devices at the ends of the wire must be terminated
with resistors that match the impedance of the wire. This is to fool the
signal on the wire into thinking that the wire is really infinitely long,
(since it just sees the same impedance all around) so it can't reflect.
In theory, since the drives are connected in parallel, you would need to
have only two devices on the line be terminated. I couldn't test this out
since the termination jumpers on the Seagate were very hard to remove. To
reconfigure the Quantum, I just pulled out its resistor packs. So the
A3000 SCSI controller was terminated, and the Seagate was terminated,
with the Quantum in between them, unterminated.
I then connected a 50-pin ribbon cable to the end of the SCSI cable
that the Quantum was connected to. The original cable was connected to the
Quantum through a connector in the middle of the cable.
The next step is to mount the Seagate physically within the A3000.
I used the empty floppy disk bracket on the right side of my computer, and
used four screws in the side holes on the bracket to hold the drive. This
part was slightly tricky since (1) I had to pry the bracket open a little bit
to fit the Seagate's 3.5-inch wide, 1-inch tall body; and (2) I had to move
the Seagate around in the bracket until I found four holes that lined up with
the bracket (the bracket has about 12 holes in it, and the Seagate had 8).
Finally, I connected the power supply --- the A3000 power supply has an
extra connector for a hard drive --- and the SCSI cable, screwed the bracket
into place, and turned the computer on.
My usual Workbench setup appeared, and I ran HDToolbox to configure
the drive. It found the Seagate at SCSI ID #5, and queried it for its
configuration (use Define New Drive Type under Change Drive Type to
query the drive). It did this successfully, and I partitioned the drive
into three chunks: a 100 MB partition for development tools, a 159 MB
partition for my new Work: volume, and a 259 MB partition for scratch
and ultimately something like Linux or NetBSD. After this, I formatted
each partition, and ran DiskSpeed 3.4 to test its speed. The results
were ... mediocre. The fastest the drive did was about 1.7 MB per
second reading from a file with long-aligned data into Fast RAM. However,
the write speeds were generally less than 10% slower! I think this is due
to an onboard 256K cache on the drive that caches writes. While I was
disappointed at the results, they didn't really mean too much to me.
I had noticed earlier that most of my compiles, TeX processing, and graphics
programs were more CPU-bound than I/O-bound. Nevertheless, it is about
three times faster than my uncached Quantum. So while I can't brag about
how fast my drive is, it doesn't affect me much practically.
Meanwhile living with the drive is pretty much a pleasure. It's
very quiet, and I have so much space! One of the first things I did was to
render a long Vista Pro animation to the scratch partition and play it back
on the disk. Playback was smooth, with a few jumps; but more importantly, I
didn't have to worry about disk space. I've just migrated my entire Work:
partition over, making the entire Quantum my boot drive. I do realize now
that I'm going to have to reorganize my work directory since AmigaDOS
doesn't deal too well with too many directories. And who knows how many
top-level directories I could put in a 159 MB partition?
DOCUMENTATION
The documentation is a small booklet that tells you how to
set the drive up. The hardware section is pretty good and to-the-
point, but the software section assumes you're going to use this
drive under MS-DOS, and mentions all sorts of neanderthal c