Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!ucsd!ucbvax!pro-grouch.cts.com!rmichel
From: rmichel@pro-grouch.cts.com (Russel Michel)
Newsgroups: comp.sys.apple
Subject: RE: SCSI drives
Message-ID: <0.apple.net@pro-grouch>
Date: 3 Dec 89 21:11:29 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 40


In response to a few recent messages about SCSI drives...

>I just bought a Powerdrive from Hard Drives International.  It's a Seagate
>ST-277N-1 (28ms model).  The drive formatted to 62 Megs and is fast. (Given a
>Transwarp GS, System 5.0.2, disktimer resulted in readings of 46/88/51 at a
>3:1 interleave)

  I have two Seagate hard drives (a ST-138N & a ST-296N) in a homebrew setup,
and found that 11:1 interleave gave the best results with DiskTimer GS on both
drives (I used SCSI.Hacker to low-level format them).  How many different
interleaves did you try? I was able to obtain Read test times comparable to
yours, and Seek test results in the 55-58 range.  Also, TWGS speed had no
effect on DiskTimer results; perhaps this is due to the timing routines used
by
that program.


>... but I have my SCSI in slot 7 and didn't want to move it to slot 5 so I
>could use more than two partitions per slot)

>... so can someone please tell me why you have to have the SCSI card in slot
5
>to be able to access more than two partitions?  Is this true for any
operating
>system? (Prodos 8,16 GS/OS)

  Installation of a SCSI card in slot 7 does not limit one to 2 partitions. 
Limitation of # of partitions is primarily a factor of the operating system in
use; ie. ProDos 8 & ProDOS 16 limit you to 2 partitions; GSOS allows up to
seven partitions in a given slot. (I may be incorrect on that last part about
GSOS; Advanced Disk Utilities may be the actual limiting factor)

  Use Advanced Disk Utilities to set more than 2 partitions AFTER using SCSIHD
Partition to initially high-level format the drive, and then you can set your
drive up as you please.

UUCP: crash!pro-grouch!rmichel
ARPA: crash!pro-grouch!rmichel@nosc.mil
INET: rmichel@pro-grouch.cts.com