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Re: Prevention and Recovery of XP Dual Boot Problems



Hi
I fall in that disk geometry trap of kernel 2.6...Original i have win
XP and luckly found your article on how to salvage the situation...but
it didn work...I followed it to the letter...nothing...

Here is something rather interesting:

If i run: 
fdisk -l /dev/hda

I get:
==================================================================
Disk /dev/hda: 61.4 GB, 61492838400 bytes
255 heads, 63 sectors/track, 7476 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
 
   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1        1543    12390808+   7  HPFS/NTFS
/dev/hda2            1543        7476    47658240    f  W95 Ext'd (LBA)
/dev/hda5            1543        3072    12284968+   7  HPFS/NTFS
/dev/hda6            3073        4602    12284968+   7  HPFS/NTFS
/dev/hda7            4602        6131    12284968+   7  HPFS/NTFS
/dev/hda8            6131        6386     2048728+   b  W95 FAT32
/dev/hda9            6386        7410     8221720+  83  Linux
/dev/hda10           7410        7476      532696+  82  Linux swap
==================================================================

which is great, the head count is correct, as the article should result in.

But, if i run:
sfdisk -g /dev/hda

I get:
==================================================================
/dev/hda: 119150 cylinders, 16 heads, 63 sectors/track
==================================================================

As if nothing has happened!



In fact, when i run:
sfdisk -d /dev/hda | sfdisk --no-reread -H255 /dev/hda

I get:
==================================================================
Warning: HDIO_GETGEO says that there are 16 heads
 
Disk /dev/hda: 119150 cylinders, 255 heads, 63 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Old situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
 
   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/hda1   *      0+   1542-   1543-  12390808+   7  HPFS/NTFS
/dev/hda2       1542+   7475-   5934-  47658240    f  W95 Ext'd (LBA)
/dev/hda3          0       -       0          0    0  Empty
/dev/hda4          0       -       0          0    0  Empty
/dev/hda5       1542+   3071    1530-  12284968+   7  HPFS/NTFS
/dev/hda6       3072+   4601-   1530-  12284968+   7  HPFS/NTFS
/dev/hda7       4601+   6130-   1530-  12284968+   7  HPFS/NTFS
/dev/hda8       6130+   6385-    256-   2048728+   b  W95 FAT32
/dev/hda9       6385+   7409-   1024-   8221720+  83  Linux
/dev/hda10      7409+   7475-     67-    532696+  82  Linux swap
New situation:
Units = sectors of 512 bytes, counting from 0
 
   Device Boot    Start       End   #sectors  Id  System
/dev/hda1   *        63  24781679   24781617   7  HPFS/NTFS
/dev/hda2      24781680 120098159   95316480   f  W95 Ext'd (LBA)
/dev/hda3             0         -          0   0  Empty
/dev/hda4             0         -          0   0  Empty
/dev/hda5      24781743  49351679   24569937   7  HPFS/NTFS
/dev/hda6      49351743  73921679   24569937   7  HPFS/NTFS
/dev/hda7      73921743  98491679   24569937   7  HPFS/NTFS
/dev/hda8      98491743 102589199    4097457   b  W95 FAT32
/dev/hda9     102589263 119032703   16443441  83  Linux
/dev/hda10    119032767 120098159    1065393  82  Linux swap
Warning: partition 1 does not end at a cylinder boundary
 
sfdisk: I don't like these partitions - nothing changed.
(If you really want this, use the --force option.)
==================================================================
what is this warning: ¨Warning: HDIO_GETGEO says that there are 16 heads¨ 
I also noticed that, in the second line of the above listing, head
count is correct (255) but the cylindar number is incorrect (should be
7476)

And if i run:
sfdisk -d /dev/hda | sfdisk --no-reread -H255 /dev/hda --force

I get:
==================================================================

Warning: HDIO_GETGEO says that there are 16 heads
 
Disk /dev/hda: 119150 cylinders, 255 heads, 63 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Old situation:
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
 
   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/hda1   *      0+   1542-   1543-  12390808+   7  HPFS/NTFS
/dev/hda2       1542+   7475-   5934-  47658240    f  W95 Ext'd (LBA)
/dev/hda3          0       -       0          0    0  Empty
/dev/hda4          0       -       0          0    0  Empty
/dev/hda5       1542+   3071    1530-  12284968+   7  HPFS/NTFS
/dev/hda6       3072+   4601-   1530-  12284968+   7  HPFS/NTFS
/dev/hda7       4601+   6130-   1530-  12284968+   7  HPFS/NTFS
/dev/hda8       6130+   6385-    256-   2048728+   b  W95 FAT32
/dev/hda9       6385+   7409-   1024-   8221720+  83  Linux
/dev/hda10      7409+   7475-     67-    532696+  82  Linux swap
New situation:
Units = sectors of 512 bytes, counting from 0
 
   Device Boot    Start       End   #sectors  Id  System
/dev/hda1   *        63  24781679   24781617   7  HPFS/NTFS
/dev/hda2      24781680 120098159   95316480   f  W95 Ext'd (LBA)
/dev/hda3             0         -          0   0  Empty
/dev/hda4             0         -          0   0  Empty
/dev/hda5      24781743  49351679   24569937   7  HPFS/NTFS
/dev/hda6      49351743  73921679   24569937   7  HPFS/NTFS
/dev/hda7      73921743  98491679   24569937   7  HPFS/NTFS
/dev/hda8      98491743 102589199    4097457   b  W95 FAT32
/dev/hda9     102589263 119032703   16443441  83  Linux
/dev/hda10    119032767 120098159    1065393  82  Linux swap
Warning: partition 1 does not end at a cylinder boundary
Successfully wrote the new partition table
 
Re-reading the partition table ...
BLKRRPART: Device or resource busy
The command to re-read the partition table failed
Reboot your system now, before using mkfs
 
If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes:  dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)
==================================================================


I alse tried outputing to a text file first, same result, in fact,
there are no warning messages:

sfdisk -d /dev/hda

will give:
==================================================================
# partition table of /dev/hda
unit: sectors
 
/dev/hda1 : start=       63, size= 24781617, Id= 7, bootable
/dev/hda2 : start= 24781680, size= 95316480, Id= f
/dev/hda3 : start=        0, size=        0, Id= 0
/dev/hda4 : start=        0, size=        0, Id= 0
/dev/hda5 : start= 24781743, size= 24569937, Id= 7
/dev/hda6 : start= 49351743, size= 24569937, Id= 7
/dev/hda7 : start= 73921743, size= 24569937, Id= 7
/dev/hda8 : start= 98491743, size=  4097457, Id= b
/dev/hda9 : start=102589263, size= 16443441, Id=83
/dev/hda10: start=119032767, size=  1065393, Id=82

==================================================================

one last note, i set the hard disk to LBA from BIOS.
Can you please help me?  I appreciate it.



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