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Article #7334Re: MAC filesystem vs UNIX filesystem
From: David W. Berry
Date: Thu, 25 Sep 1986 13:43
Date: Thu, 25 Sep 1986 13:43
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1577 bytes
In article <8609232036.AA10451@cory.Berkeley.EDU> dillon@CORY.BERKELEY.EDU (Matt Dillon) writes: > >>Jim Budler writes: >>I hope you don't think that a Unix file is all physically contiguous. > > Unix files are physically contiguous with the exception that you can, >say, seek to position 11423444, do a write, and 11423444 bytes will actually >NOT be physically allocated... the intermediate data between X and 1142344, >when read, turns out to be zeros. (at least in BSD4.2)... In fact, the >DBM database utilities use this extensively. Just to be the first of many to point this out, Unix files are rarely physically contigouus. Logically yes, physically definitely not. Various versions of UNIX go to varying degrees of effort to attempt to group the a file as contiguously as possible, but I know of no version which will guarantee the physical contiguity of a file. David -- David W. Berry dwb@well.uucp dwb@Delphi dwb@GEnie 293-0752@408.MaBell
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!lll-crg!lll-lcc!well!dwb From: dwb@well.UUCP (David W. Berry) Newsgroups: net.micro.mac Subject: Re: MAC filesystem vs UNIX filesystem Message-ID: <1831@well.UUCP> Date: Thu, 25-Sep-86 09:43:47 EDT Article-I.D.: well.1831 Posted: Thu Sep 25 09:43:47 1986 Date-Received: Thu, 25-Sep-86 18:49:29 EDT References: <8609232036.AA10451@cory.Berkeley.EDU> Reply-To: dwb@well.UUCP (David W. Berry) Organization: Whole Earth Lectronic Link, Sausalito CA Lines: 23