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authorMystery Man <unknown@mandriva.org>2005-04-04 19:00:13 +0000
committerMystery Man <unknown@mandriva.org>2005-04-04 19:00:13 +0000
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- Cylinder/Head/Size Hell Is Not Over
-
- pixel@mandrakesoft.com
- $Date$
-
-
-Nowadays, you can boot Linux without ever relying on CHS
-(Cylinder/Head/Size):
-
-- CHS information on partition table is obsolete and not used anymore.
-It was causing the 1024th cylinder limitation:
- - disallowing partitions above 8GiG. Problem overcome using 28bits Linear
- Block Addressing (LBA) in partition table.
- - disallowing to boot on partition above 8GiG (due to int13 limitation used
- in bootloaders). Problem overcome using int13 extensions (EDD)
-
-Logical CHS (Cylinder/Head/Size) and physical CHS are not related anymore.
-Especially the size of a hard drive is not a multiple of the number of
-Cylinders.
-
-
-The problem is that many tools still rely somewhat heavily on CHS information.
-- most tools adjust partitions on cylinder boundary
-- some tools compute the size of the disk based on CHS (eg: fdisk)
-
-
-Resulting problems in various tools:
-
-- last partition not cylinder boundary adjusted, and overrun CHS computed size
- - fdisk
- > Total allocated sectors %d greater than the maximum %d
- - cfdisk (need confirmation)
- > FATAL ERROR: Bad primary partition %d: Partition ends after end-of-disk
- or
- > FATAL ERROR: Bad logical partition %d: Partition ends after end-of-disk
- - Partition Magic (version?)
- > Error #109: Partition ends after end of disk
- - Windows <= 98se, Windows Me
- (doesn't like it, what error message?)
-
- Tools handling it correctly:
- - parted and so diskdruid in RedHat >= 7.2 (or is it 7.x?)
- - diskdrake >= Mandrake 8.2
- - Windows XP (need confirmation)
-
- Tools using the full size of the disk, and so causing pbs with fdisk/cfdisk/...:
- - diskdrake == Mandrake 8.2
-
-- disagreement between CHS and linear address
- - parted
- > "Warning: Unable to align partition properly. This probably means that
- > another partitioning tool generated an
- > incorrect partition table, because it didn't have the correct BIOS
- > geometry. It is safe to ignore,but
- > ignoring may cause (fixable) problems with some boot loaders.
- > Ignore Cancel ? C
- - lilo
- > Warning: Kernel & BIOS return differing head/sector geometries for device 0x80
- > Kernel: 38792 cylinders, 16 heads, 63 sectors
- > BIOS: 1023 cylinders, 255 heads, 63 sectors
- > Device 0x2100: Inconsistent partition table, 2nd entry
- > CHS address in PT: 48:0:1 --> LBA (771120)
- > LBA address in PT: 48384 --> CHS (3:3:1)
- > The partition table is *NOT* being adjusted.
-
-