[NBLUG/talk] extended partition does not start at a cylinder boundary

[Ian Sutherland]

I have created a problem that I do not know how to fix, "extended
partition does not start at a cylinder boundary". Help.

[root at localhost sbin]# sfdisk -l /dev/hdd
 
Disk /dev/hdd: 79656 cylinders, 16 heads, 63 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Units = cylinders of 516096 bytes, blocks of 1024 bytes, counting from 0
 
   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/hdd1   *     15+  66220-  66205-  33367005    f  W95 Ext'd (LBA)
                start: (c,h,s) expected (15,15,1) found (1,0,1)
                end: (c,h,s) expected (1023,15,63) found (1023,254,63)
/dev/hdd2      66221   66422     202     101808   83  Linux
/dev/hdd3      66423   78615   12193    6145272   83  Linux
/dev/hdd4      78616   79655    1040     524160   82  Linux swap
/dev/hdd5         16   39987-  39972-  20145478+   7  HPFS/NTFS
                start: (c,h,s) expected (16,0,1) found (1,1,1)
                end: (c,h,s) expected (1023,15,63) found (1023,254,63)
/dev/hdd6      39987+  66220-  26234-  13221463+   7  HPFS/NTFS
                start: (c,h,s) expected (1023,15,63) found (1023,1,1)
                end: (c,h,s) expected (1023,15,63) found (1023,254,63)

[root at localhost sbin]# sfdisk -l /dev/hdc
 
Disk /dev/hdc: 19590 cylinders, 16 heads, 63 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Warning: The partition table looks like it was made
  for C/H/S=*/255/63 (instead of 19590/16/63).
For this listing I'll assume that geometry.
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from
0
 
   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/hdc1   *      0+    531     532-   4273258+   7  HPFS/NTFS
/dev/hdc2        532    1228     697    5598652+   f  W95 Ext'd (LBA)
/dev/hdc3          0       -       0          0    0  Empty
/dev/hdc4          0       -       0          0    0  Empty
/dev/hdc5        532+    650     119-    955836    7  HPFS/NTFS
/dev/hdc6        651+   1228     578-   4642753+   7  HPFS/NTFS

Thanks, Ian


-- 
Ian Sutherland
2 Varda Street
Rohnert Park, CA 94928
707-792-6891
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