Path: news.uiowa.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!news.mathworks.com!news.kei.com!newsstand.cit.cornell.edu!newstand.syr.edu!news.corpcomm.net!news.gate.net!news.gate.net!not-for-mail From: stever@gate.net (Steve Reeves) Newsgroups: comp.sys.apple2 Subject: Re: ProDOS on a Zip 100 drive Date: 23 Jan 1996 02:39:23 -0500 Organization: CyberGate, Inc. Lines: 75 Message-ID: <4e23bb$ng2@seminole.gate.net> References: <4di0ms$7qp@rock101.genie.net> <4djc49$10pm@flood.weeg.uiowa.edu> <4dktje$be9m@hopi.gate.net> Reply-To: stever@gate.net NNTP-Posting-Host: seminole.gate.net In article , David Empson wrote: >In article <4dktje$be9m@hopi.gate.net>, Steve Reeves wrote: > >> I've been trying to get a Mac to recognize ProDOS partitions as well >> (on a regular hard drive, though, not a Zip), and I too have been >> unsuccessful. The Mac seems to ignore any foreign partitions on the >> device if it finds an HFS partition. > >This is probably connected to the Mac device driver (stored in its own >partition on the drive). > >Some Mac drivers will ignore all partitions that are not specified as >"Apple_HFS" in the partition map. Anything else is regarded as an >unknown partition type, and is not made available to the Mac OS. PC >Exchange (for example) will not be able to see any ProDOS partitions, >because "Apple_PRODOS" partitions are ignored. Thanks, David, but PC Exchange is supposed to be able to see ProDOS partitions. The following paragraph is from the PC Exchange 2.0.3 ReadMe file (on the net at URL "gopher://info.apple.com/00/TIL/ Macintosh%20Software/Utility%20Software/Macintosh%20PC%20Exchange/ PC%20Exchange%202.0.3%20%20ReadMe%20File"): If a SCSI hard disk or removable media cartridge has been formatted to contain multiple partitions, you can use PC Exchange to mount the Macintosh-, DOS-, or ProDOS-format partitions as individual logical drives on the Macintosh Desktop. If the disk contains both Macintosh and DOS-format partitions, PC Exchange will only recognize the Macintosh partition. In addition, PC Exchange will only recognize ProDOS-format partitions on SCSI hard disks that are less than 32 megabytes. (I assume there should be an "or equal to" after "less than" in the last sentence.) I found another article in the Apple Technical Info Library (attached below) that appears to explain the problem. (The URL is "gopher://info.apple.com/00/TIL/DOS%20and%20Windows%20Environment/ PCXchg%20ProDOSMSDOS-Mac%20Partns".) Does this sound reasonable? PC Exchange: ProDOS, MS DOS, and Macintosh Partitions (8/94) Article Created: 24 August 1994 TOPIC --------------------------------------------------------- I'm sharing ProDOS or MS DOS partitions on a volume with a Macintosh partition. Why can't I see the ProDOS and MS DOS partitions with PC Exchange? DISCUSSION ---------------------------------------------------- Any ProDOS or MS DOS volume originally formatted as a Macintosh volume may not work with PC Exchange. It seems certain Macintosh residue (boot block information) is left on the drive so PC Exchange is confused at the Macintosh-like characteristics. Since PC Exchange sees the drive as a Macintosh drive, it just ignores it and won't mount as a MS DOS or ProDOS volume. The solution is to perform a low level format on any Macintosh volume before formatting it with a non-Macintosh operating system. This low level format (with some Apple II or DOS utility) eliminates Macintosh boot block information from the drive so PC Exchange won't see it as a Macintosh drive. Support Information Services Copyright 1994, Apple Computer, Inc. Keywords: ksts ==================================================================== This information comes from the Apple Technical Information Library. -- Steve Reeves stever@gate.net