Xref: utzoo comp.sys.mac:44481 comp.sys.next:4429
Path: utzoo!attcan!uunet!wuarchive!mit-eddie!mit-amt!wilson
From: wilson@mit-amt.MEDIA.MIT.EDU (Wilson Chan)
Newsgroups: comp.sys.mac,comp.sys.next
Subject: Re: What do I want to see in the Apple of the 90's?
Message-ID: <1225@mit-amt.MEDIA.MIT.EDU>
Date: 17 Dec 89 21:38:09 GMT
References: <6773@tank.uchicago.edu>
Reply-To: wilson@media-lab.media.mit.edu (Wilson Chan)
Organization: MIT Media Lab, Cambridge MA
Lines: 20

In article <6773@tank.uchicago.edu> phd_ivo@gsbacd.uchicago.edu writes:
>
>>Anyone who says 90 ms seek time isn't slow is lying or brain-dead.
>
>How about 90ms over a 100 terabyte surface :-)? If you restricted yourself to
>half the OD surface (128MB), you get approx. half the average access time.
>
>There is of course another problem, if I am correct: To write, the heads must
>pass twice over the surface (once to erase, I think).
>
>/ivo welch

To quote Sept. 1989 issue of UnixWorld:

"Writing is done in three passes-- an erase pass, a write pass, and a verify 
pass.  ...writing took about the same amount of time as reading..." (p.82)

wilson@media-lab.media.mit.edu

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