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Boot partition beginning past 1024 cylinders



 
 
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  #1  
Old December 18th 05, 08:09 PM posted to comp.sys.ibm.pc.hardware.storage
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Default Boot partition beginning past 1024 cylinders

Trying to make 3 or 4 bootable partitions on one disk is getting a little
tight. Where do we stand with the limit on the first cylinder of bootable
partitons? Have the BIOS standards people dealt with this yet, or do boot
managers work around the problem ok?


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  #2  
Old December 18th 05, 10:17 PM posted to comp.sys.ibm.pc.hardware.storage
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Default Boot partition beginning past 1024 cylinders

"Tom Del Rosso" wrote in message
Trying to make 3 or 4 bootable partitions on one disk is getting a little
tight. Where do we stand with the limit on the first cylinder of bootable
partitons? Have the BIOS standards people dealt with this yet, or do boot
managers work around the problem ok?


BIOS is not involved with partition bootrecords, the MBR bootcode is. So
it depends on the MBR bootcode. Newer OSes use Int13ext instead of Int13.
  #3  
Old December 18th 05, 10:40 PM posted to comp.sys.ibm.pc.hardware.storage
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Default Boot partition beginning past 1024 cylinders

Tom Del Rosso wrote:

Trying to make 3 or 4 bootable partitions on one disk is getting a
little tight. Where do we stand with the limit on the first cylinder
of bootable partitons? Have the BIOS standards people dealt
with this yet, or do boot managers work around the problem ok?


Yes, its perfectly possible for a boot manager
to ignore that limit and any decent one does that.


  #4  
Old December 19th 05, 05:19 AM posted to comp.sys.ibm.pc.hardware.storage
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Default Boot partition beginning past 1024 cylinders

Previously Tom Del Rosso wrote:
Trying to make 3 or 4 bootable partitions on one disk is getting a little
tight. Where do we stand with the limit on the first cylinder of bootable
partitons? Have the BIOS standards people dealt with this yet, or do boot
managers work around the problem ok?


Booting with a reasonably new boot manager should not be a problem.
I use Grub, which boots both Linux and Windows XP without problems.

Arno


  #5  
Old December 19th 05, 12:11 PM posted to comp.sys.ibm.pc.hardware.storage
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Default Boot partition beginning past 1024 cylinders

In ,
Tom Del Rosso va escriu
Trying to make 3 or 4 bootable partitions on one disk is getting a
little tight. Where do we stand with the limit on the first cylinder
of bootable partitons?


Nowadays, the only relevant limit is that you need to keep your booting disk
below 2TB (MBR architecture).
The last mainstream OS release with a 1024-cylinder limit was Windows NT4
(end of extended support this month.)

BTW, the first cylinder only matters with respect to the MBR code; after it,
the boot loader may also have issues, and it would be the last cylinder of
the partition which would matter (in fact, the highest cylinder of the files
used, which could be significantly lower, but it is a bad idea to play with
that.)


Have the BIOS standards people dealt with this yet,


Yes, around 1992.

or do boot managers work around the problem ok?


They do quite well, for quite some time now.


Antoine

  #6  
Old December 20th 05, 03:31 AM posted to comp.sys.ibm.pc.hardware.storage
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Default Boot partition beginning past 1024 cylinders


"Tom Del Rosso" wrote in message
...
Trying to make 3 or 4 bootable partitions on one disk is getting a little
tight.


What does "getting a little tight" mean? Partition limits of 4 primaries or
3 primaries + 1 extended are imposed by MS HD architecture, that hasn't
changed. But you can use BootIt NG unlimited partitions to get around that
limitation (w/ caveats).

Where do we stand with the limit on the first cylinder of bootable
partitons?


What limit? First sector is the boot sector, you referring to that? A good
boot manager can be loaded from first sector, from which most any OS can be
booted from your other primaries.

Have the BIOS standards people dealt with this yet, or do boot
managers work around the problem ok?


Not a BIOS issue, HD architecture issue specific to Microsoft.

Jim


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