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- Newsgroups: comp.sys.mac.system
- Path: sparky!uunet!mcsun!news.funet.fi!funic!nntp.hut.fi!vipunen.hut.fi!jmunkki
- From: jmunkki@vipunen.hut.fi (Juri Munkki)
- Subject: Re: System 7.1 Bug, PB 180 Bug or Bad HD?
- Message-ID: <1993Jan5.223854.696@nntp.hut.fi>
- Sender: usenet@nntp.hut.fi (Usenet pseudouser id)
- Nntp-Posting-Host: vipunen.hut.fi
- Reply-To: jmunkki@vipunen.hut.fi (Juri Munkki)
- Organization: Helsinki University of Technology
- References: <1icjloINNnh3@darkstar.UCSC.EDU>
- Date: Tue, 5 Jan 1993 22:38:54 GMT
- Lines: 52
-
- In article <1icjloINNnh3@darkstar.UCSC.EDU> ericg@hum.ucsc.edu (Eric Goodman) writes:
- >I've got a PowerBook 180 4/120 (Finally!) and am having an annoying if
- >not fatal problem with the hard drive. I repartitioned the hard drive to
- >reclaim the hidden space, then re-installed Sys 7.1 from the installer
- >disks, in case that's important. The problem is that whenever I have a
- >crash that requires a restart the internal drive is corrupted. The drive
- >is found with no problems, but I get the "This disk is damaged, Do you
- >want to initialize it?" message. I can get the drive back by running
- >Norton Disk Doctor, though Norton says the disk may be damaged. This is
- >an infinitely repeatable problem.
- >
- >So the question is as the title says: Is this something wrong with the
- >System 7.1 installer, the PB ROMs or just a bad HD? (I am hoping to avoid
- >reformatting because of the 85 Meg of stuff I'd have to back up - also,
- >if this is a known problem, I'd like it solved before the backup, not
- >after).
-
- I was just going to write an article about this, so I decided to be a good
- usenet citizen and read the old articles. Sometimes it really pays off to
- follow the rules...
-
- Anyway, I my PB160 HD has now crashed 3 times like this. On Monday, it happened
- at the office, where we didn't have the correct system enabler, so I couldn't
- even boot the machine to recover the files. We couldn't even find the enablers
- from AppleLink. At least I learned always to carry a disk tools disk with me.
-
- My theory is that you are used to using the power button to reset the machine.
- Since Apple changed the power button to handle a soft restart on the new
- machines, they probably introduced a problem where the disk is flushed when
- the button is pressed (even if it is held down long enough so that the
- machine truly shuts down).
-
- I found that Spectre 1.0 will crash in 24 bit addressing mode and
- reproduce the bug. To test my theory, I crashed the machine this way
- and instead of holding down the power button, I used a pen to push the
-
- A lot of old games crash on the PB160 and 180, because the video RAM is not
- visible to programs that run in 24 bit addressing mode. Games have to call
- SwapMMUMode on these machines if they want to write directly to the screen.
- These games usually run just fine if you run the machine in 32-bit addressing
- mode.
-
- So, to avoid this problem, all you have to do is keep your finger off the
- power button when the machine is on. I'm not happy about this, so I hope that
- Apple will fix this (ASAP), since it's a very easily reproducible bug.
-
- The curious thing is that "Disk First Aid" thinks that the HD is perfectly
- ok and that no repairs are necessary.
-
- --
- Juri Munkki Windsurf: fast sailing
- jmunkki@hut.fi Macintosh: fast software
-