Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!necntc!dandelion!ulowell!page
From: page@swan.ulowell.edu (Bob Page)
Newsgroups: comp.sys.amiga
Subject: Re: AmigaLine6 - How to calulate the AmigaDOS hash function
Message-ID: <2449@swan.ulowell.edu>
Date: 19 Jan 88 21:13:12 GMT
References: <8801182112.AA24295@jade.berkeley.edu> <22657@ucbvax.BERKELEY.EDU>
Reply-To: page@swan.ulowell.edu (Bob Page)
Organization: University of Lowell, Computer Science Dept.
Lines: 18

bryce@hoser.berkeley.edu (Bryce Nesbitt) wrote:
> this hash function is valid ONLY for filesystems of type "DOS ".

That should be "DOS\0" or "DOS<NULL>", not "DOS<SPACE>".

Present and Future DOS haquers: you should check this from now on.
Since the DOS utilities all want to see 'D' 'O' 'S' as the first three
bytes of block zero (and don't care about the next byte), it is safe
to assume that future versions of the file system will have something
OTHER than '\0' there.

So, if the LSByte of block 0, longword 0 is a zero, you're using the
OLD file system.  If it isn't, either the disk is trashed or you're
using a NEW file system.

..Bob
-- 
Bob Page, U of Lowell CS Dept.  page@swan.ulowell.edu  ulowell!page
"I don't know such stuff.  I just do eyes."  -- from 'Blade Runner'