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#1 2015-07-13 05:49:39

raoulduke
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Registered: 2015-07-02
Posts: 36

Dual-boot 7.6/8.6 PM 7100

I guess I might as well put this one up.  I got a 2gb HD with 3 equal-sized partitions, one with 7.6.1 (I think) pre-installed.  I put it in my 7100 and installed 8.5 on another partition.  It was fine until (I forget why I had to do this, exactly) I updated to 8.6.  Subsequently every attempt to boot into 7.6.1 results in a blank error message/interrupt prompt that does nothing and has no options...

The third partition is a permanent storage drive; so though I have no problem wiping either of the system drives, I'd prefer to keep that one in tact.  I wiped the 7.6.1 partition and reinstalled 7.6 from the CD, but the same error recurs.  I did delete all the files the entire 7.6.1 drive.  [I don't know that much about classic disk tools - is there a better way to wipe a partition?]  I guess the next step is to wipe both.

But I'm curious what the source of the problem is and I don't recall a specific answer at 68kmla.  I definitely (if it's the default option) updated the HD drivers with the 8.6 update, but I 'updated' (I assume/hope that means overwrote with older drivers) when I installed 7.6.  The blank-prompt pops up probably at the end of the Welcome to Mac OS screen before it starts to load extensions.  And I can soft reset from it.  It's a 2gb drive, so each partition is only ~680mb and they're all HFS.

Last edited by raoulduke (2015-07-13 05:52:09)

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#2 2015-07-13 08:50:17

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 955
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Re: Dual-boot 7.6/8.6 PM 7100

i like to keep a 7.5 boot disk around, and use the disk start up in there.  that is what set the HD / partition the mac will boot to.
https://archive.org/details/download.in … om.2012.11  you can go here and download the entire Old Mac Software Archive


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#3 2015-07-13 16:56:48

raoulduke
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Registered: 2015-07-02
Posts: 36

Re: Dual-boot 7.6/8.6 PM 7100

The problem is not being able to select the startup disk,  though.

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#4 2015-07-13 21:19:19

uniserver
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From: Sf, Mi
Registered: 2014-05-15
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Re: Dual-boot 7.6/8.6 PM 7100

darn it.. can you explain your situation more simply?   I guess i'm lost smile


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#5 2015-07-13 21:31:45

raoulduke
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Registered: 2015-07-02
Posts: 36

Re: Dual-boot 7.6/8.6 PM 7100

Any time I try to boot from 7.6 (including from a system disk's startup disk control panel) at the end of the Welcome to Mac OS screen, before extensions start to load, a prompt pops up and freezes the boot.  It looks like a blank/nondescript interrupt or error message.  8.6 works fine.

tmp_32125_20150713_173516_1228685560.jpg

Then I have to reset the boot disk to 8.6.

Last edited by raoulduke (2015-07-13 21:40:26)

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#6 2015-07-13 21:48:22

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 955
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Re: Dual-boot 7.6/8.6 PM 7100

so i wonder if you pulled the hd out, popped another one in and installed 7.6 again, what would happen.


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#7 2015-07-13 21:56:31

raoulduke
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Registered: 2015-07-02
Posts: 36

Re: Dual-boot 7.6/8.6 PM 7100

That I don't know.*  I think this is the only SCSI drive I have of appropriate size that's still alive.  However, I did reinstall 7.6 (alongside updating (i.e. downgrading?) the HD drivers), and the error is the same.

When I have something I need to sit still for for like 4 hours for I'll reinstall both OS's.

*Wait, because you think it might be a machine/hardware issue?

Last edited by raoulduke (2015-07-13 21:56:59)

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#8 2015-07-13 22:12:43

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 955
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Re: Dual-boot 7.6/8.6 PM 7100

i curious if maybe that section of the partition might have a bad spot.


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#9 2015-07-13 22:39:08

raoulduke
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Registered: 2015-07-02
Posts: 36

Re: Dual-boot 7.6/8.6 PM 7100

oh; fair point.  i'll switch which partition i reinstall each OS on when i reinstall.

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#10 2015-07-13 22:41:30

macdrone
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From: Rainier, Or
Registered: 2014-05-25
Posts: 224

Re: Dual-boot 7.6/8.6 PM 7100

You made the 2 partitions with HFS then installed 7.6?  I think that may be the issue.  I think you have to do it the other way.  Partition with 7.6 cd into 2 partitions then install 8 on one partition.  Mac os 7.6 does not understand the hard drive in mac os 8.  If you burn a cd in mac os 8 and put it in a 7.6 it will have a document that says why did all my files go?  Same with 8 to 9.  I used to do a bunch of dual booting but it was always a hassle and unless the mac is on all the time or the pram battery is good you have to like always boot twice to get to the OS you want usually as it forgets the startup volume as its not saved.

I hope I gave you some helpful information.

good luck

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#11 2015-07-13 23:54:14

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 946
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Re: Dual-boot 7.6/8.6 PM 7100

Yeah, 8.1 added HFS plus so if you formatted with 8.1+, 8.0 and under won't be able to read it.


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#12 2015-07-14 01:06:57

raoulduke
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Registered: 2015-07-02
Posts: 36

Re: Dual-boot 7.6/8.6 PM 7100

Thanks guys.  I didn't partition the drive but I assume it was partitioned with 7.6.1 or 7.6.  However I'll be sure to use 7 to format - although I'm not going to actually format so if anyone knows of a partition tool that'd be very useful.   I will also be sure never to update the HD drivers although you'd think that'd still be a problem for 8.5.

Sorry uni, I omitted a second "not" above.   I think that was at least part of the confusion.

Last edited by raoulduke (2015-07-14 07:01:05)

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#13 2015-07-17 18:16:01

raoulduke
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Registered: 2015-07-02
Posts: 36

Re: Dual-boot 7.6/8.6 PM 7100

I will try that now, Uni.  Would still really appreciate someone telling me if I can format just a partition without repartitioning the whole drive...  I only really know OS X for disk tools stuff on Macs. **lol.  "Erase Disk"... whoops!  Should have realized that's a better option than dragging to the Trash a while ago.

Last edited by raoulduke (2015-07-17 18:20:56)

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#14 2015-07-17 19:14:53

raoulduke
Member
Registered: 2015-07-02
Posts: 36

Re: Dual-boot 7.6/8.6 PM 7100

I was going to say the experiment lost some element of control when I used a different erase method.

However... shockingly, it boots (from restarting the installer) directly into that failure-prompt... I don't get it...  That was also on - what had been - the working partition for 8.6...  That was a useful waste of time.

Actual method in full:

1) Boot to 7.6 Installer CD.
2) Erase 7.6 partition (as "System 8.5"); erase 8.6 partition (as "System 7.6").
3) "Update" disk drivers via 7.6 CD.
4) Install 7.6 on the new 7.6 (old 8.6) partition.
5) Fail...

Obviously the next (and final) step is reformatting.  Intermediarily, I wonder what'd happen if I tried a different version of 7, or a different version of 8.  [Although the problem is not this version of 7; if you look at the problem's pedigree, the issue only started after I upgraded to 8.6 - the original install of 7.6 worked perfectly (and has also on a number of my other machines).  This may then suggest there's something about my storage folder that's retaining settings?  Or alternatively maybe it is an HD drivers issue, and the installers can't downgrade from the 8.6 drivers, which are being retained because I haven't reformatted the whole disk or destroyed/recreated the partition table?  I don't know if someone can debunk my random thoughts...?]

Last edited by raoulduke (2015-07-17 19:32:06)

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#15 2015-07-18 00:59:25

volvo242gt
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From: Duvall, WA
Registered: 2014-05-22
Posts: 404
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Re: Dual-boot 7.6/8.6 PM 7100

You'll need to reformat the drive as HFS standard.  It's still being used as HFS+.  Either that, or just throw in the towel, put a 250MB or whatever size hard drive into an external case, and install 7.6 on that.

-J


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