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- Path: sparky!uunet!cs.utexas.edu!news
- From: benkei@cs.utexas.edu (William Kent Richards)
- Newsgroups: comp.sys.mac.hardware
- Subject: Re: Mac Plus Ext. HD. Any problems?
- Date: 1 Sep 1992 02:56:09 -0500
- Organization: U Texas Dept of Computer Sciences, Austin TX
- Lines: 32
- Message-ID: <la68gpINN21j@nada.cs.utexas.edu>
- References: <kpw105-310892113642@150.203.18.9> <1992Aug31.190358.19383@news.Hawaii.Edu>
- NNTP-Posting-Host: nada.cs.utexas.edu
-
- In article <1992Aug31.190358.19383@news.Hawaii.Edu> deane@galileo.ifa.hawaii.edu (Kimo Kanaka De`ane) writes:
-
- > You must format the drive with the proper interleave ratio (for Mac+
- >that's 1:1) or else you may get frequent disk errors. I have a Mac+ and a
-
- I believe this is incorrect. I remember reading that interleave for
- the Plus should be 3:1, and also when I used Ontrack to format my disk,
- the default for the Plus was 3:1.
-
- This make sense due to the slow speed of the plus. The interleave is
- how logically contiguous sectors are placed physically on the disk (on
- the track). 1:1 means they are placed right after another, 2:1 means
- they are placed every other sector, etc. The Plus is so slow that it
- cannot read as fast as the disk can deliver, so if you do it 1:1 or
- 2:1, the disk cannot deliver the sectors as soon as it is ready
- because the Plus is still digesting the previous, so it skips it on
- that rotation, and delivers it when it comes back around to it. Thus,
- with to incorrect interleave, the computer ends up waiting while the
- disk goes back around.
-
- >LaCie Cirrus 80M external, and I love it. It's formatted at 1:1, and it's
-
- You will probably get a much faster transfer time (which is so small
- compared to seek time that you may not even notice it except on
- large contiguous accesses) if you go to 3:1.
-
- Ah, I remember where I read it (the proper value for the plus): In an
- old GCC catalog. The phone person said so, too.
- --
-
- Kent Richards "Practice random acts of kindness
- benkei@cs.utexas.edu and senseless beauty"
-