Thanx in advance for taking time to acknowledge this post..
Normally I would assume that IDE and SCSI work the same, but thats
because I have always used DOS and never needed to really understand
drive geometry. After Linux, I have learned quit a bit, accually A
LOT. but theres still pieces missing from my puzzle I've done seaches
all over the place and cannot find any document that will put me that
one step up on my issue, (ahhhhh, I'm stuck on a plateu) All the docs
are from ppl like me, (looking for help) and the other docs give the
basic idea and teach about large disk geometry, 80% of the ones out
there are the exact same document, at a different location.
Well, I've had this problem were I use a SCSI drive that has >1024
cyl. with total of 2GB, (and total of 2047 cyl.) I though that this
was no problem with Linux, (now I think it does) and I know that DOS
doesn't lik it. So what I tried to do was tell the AHA 2842
controller to change geometry (for the sake of M$-DOS) so that it will
also boot, problem was I could get Linux to conform to this geometry,
I even tried to use the "apend hd=c,h,s" in LILO, with no success.
And I posted to a few different groups with no reply.
My solution to this was: forget about the translation, don't make DOS
1.5GB just leave it as 1GB. so I didI told DOS to partition upto cyl,
1020, that worked fine.. Now it was time to have Linux installed on
the rest of the drive. I started Linux at 1021 ..... NOW THIS IS WERE
THE PROBLEM COMES IN. I made that partition primary to finish at cyl.
1663. the next partition I made extended to complete the drive and so
that will start and finish at 1664 - 2047 respectively. Inside this
ext part. I made a 16MB swap, and finished off the rest of the
ext.part. with a logical drive..
NOW, I hope you were able to follow me on that, If not Please e-mail
me and I'll send you the part.table that Linux generates.
(I'm not asking anyone to hold my hand here, just a point in another
I'm using a boot mngr from V-communication called system commander. (I
personaly give it and 11 on a 0-10 scale)
It recognized my DOS partition (no problem) it recognized my WIN95
partition (no problem) in recognized my Linux partition (with a
problem) it didn't boot it, as soon as I select Linux, it doesn't boot
it.. Now, I've had all three part. with successful boot when I was
testing. the only two difference were that all my partitions were
about 65MB therefore the last partition ended under cylinder 200.
and I didn't have any extended partition created..
So now I'm stuck BIG TIME.
I've tried my two theories and both have been unsuccessful.
they were (just to refresh) make Linux conform to the AHA >1G for DOS
translation. but Linux did not want to look at the "append" it gave me
and error with something like "hda cannot read 255 heads" I noticed
two problems here the HDA which should show SDA (unless append is not
possible with SCSI) the the reason for the 255 heads is because DOS >
1GB is set to c=261,hd=255,sc=63 with out the translation its
and the other theory, was, don't use translation, and make sure that
all OS's start before c=1024.
that means 1 G for MS and 1G for Linux.
SO, AFTER ALL THIS, IS IT POSSIBLE FOR ME MAKE LINUX CONFORM TO A
DIFFERENT GEOMETRY ON A SCSI DRIVE. ( if this is possible HOW, it
would solve all my problems.. I've been pulling my hair for about a
month now) is there a differnet switch for SCSI eg>apend sda=c,h,s ???
Or maybe I'll even settle for my second alternative and leave the
translation off, BUT does my ext part. have to start under 1024
And again, I'm not asking for someone to do it for me or to hold my
hand about this issue, I have been doing a lot of reading and testing,
but its pritty lame when this should only take a first timer a day or
two to figure things out.. I'm missing some piece of information
somewhere. Tips like would I be haveing the same problem if the drive
was IDE?? Is it possible to modify SCSI geometry??
I would really like to get out of this MS world, But I can't just
jump out (it's too far, really though, I need things like 95 because
of the work I do)
I will be very greatful if you can e-mail me, also a post reply makes
no difference to me, I guess it would be better in case someone else
is haveing the same / similar problems..