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- Newsgroups: comp.arch.storage
- Path: sparky!uunet!spool.mu.edu!wupost!csus.edu!netcom.com!nagle
- From: nagle@netcom.com (John Nagle)
- Subject: Re: Inner track transfer rate vs. Outer track transfer rate
- Message-ID: <1992Dec24.044728.14307@netcom.com>
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- References: <1992Dec18.145311.27416@sequent.com> <1992Dec23.214657.4722@TorreyPinesCA.ncr.com>
- Date: Thu, 24 Dec 1992 04:47:28 GMT
- Lines: 22
-
- martins@TorreyPinesCA.ncr.com (Martin Sandman 3562) writes:
- >Two months ago I didn't know about zones on disks that take advantage
- >of the greater circumference of the outer zones. It not only increases
- >capacity of a disk but performance as well.
-
- Yes, provided you have some kind of high-level drive interface where
- true drive layout is hidden from the software, such as IDE or SCSI, this
- is a good way to improve drive density. It's tougher if the operating system's
- driver has to deal with all these zones.
-
- It does create problems for some disk-optimization software,
- though, where attempts are made to position files across track boundaries
- for optimal reading speed. Any info on how programs such as the Norton
- Utilities deal with this issue?
-
- There's also the issue that disk drivers which reorder requests
- to minimize head movement may not get the results expected. But then,
- with today's physically small drives, head movement time is comparable to
- rotational latency, and the old emphasis on minimizing head movement
- no longer applies.
-
- John Nagle
-