Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!olivea!apple!dlyons
From: dlyons@Apple.COM (David A. Lyons)
Newsgroups: comp.sys.apple2
Subject: Re: Identify a ProDOS disk?
Message-ID: <48546@apple.Apple.COM>
Date: 28 Jan 91 00:59:45 GMT
References: <25235@fs1.NISC.SRI.COM>
Distribution: comp
Organization: Apple Computer Inc., Cupertino, CA
Lines: 31

In article <25235@fs1.NISC.SRI.COM> cwilson@NISC.SRI.COM (Chan Wilson [Animal]) writes:
>How is it possible to identify a ProDOS disk?  I'm looking for a magic
>number of some sorts, someplace, anywhere. 
>
>Ideally, it'd be a magic number someplace near the front.  I'm into dealing
>with disks as data streams at the moment...
>
>Hep Me!
>
>--Chan
>
>Chan Wilson                                  Chief Hard-Question Answer Person
>SRI Intl. Network Information Systems Center
>333 Ravenswood Ave., EJ287			Internet: cwilson@nisc.sri.com
>Menlo Park, CA., 94025				Phone: (415)859-4492
>    "If I want to be a surfer this month, I bloody well will be."

Try verifying the sanity of the image of block 2.  If it's ProDOS, you
will have a zero backward link to the previous directory block, a disk
name in the form $Fx + X characters + $00s filling the remainder of the
16 byte field (counting the length byte); the characters in the name will
all be upper-case A-Z, 0-9, and period (lowercase characters in the name
are flagged separately).
-- 
David A. Lyons, Apple Computer, Inc.      |   DAL Systems
Apple II System Software Engineer         |   P.O. Box 875
America Online: Dave Lyons                |   Cupertino, CA 95015-0875
GEnie: D.LYONS2 or DAVE.LYONS         CompuServe: 72177,3233
Internet/BITNET:  dlyons@apple.com    UUCP:  ...!ames!apple!dlyons
   
My opinions are my own, not Apple's.