new@luna:~/Desktop/temp/laptop-image-config1$ cat /proc/partitions
major minor  #blocks  name

   3     0  156290904 hda
   3     1   39062016 hda1
   3     2  115234245 hda2
   3     3    1992060 hda3
   3    64  117220824 hdb
   3    65  117218241 hdb1
 253     0   39062016 dm-0
 253     1  115234245 dm-1
 253     2    1992060 dm-2
 253     3  117218241 dm-3
 253     4   78180291 dm-4
   8    16   78184008 sdb
   8    17   78180291 sdb1
new@luna:~/Desktop/temp/laptop-image-config1$ sudo sfdisk -d /dev/hda
# partition table of /dev/hda
unit: sectors

/dev/hda1 : start=        0, size=        0, Id= 0
/dev/hda2 : start=        0, size=        0, Id= 0
/dev/hda3 : start=        0, size=        0, Id= 0
/dev/hda4 : start=        0, size=        0, Id= 0
new@luna:~/Desktop/temp/laptop-image-config1$


*********** calculations ******************
hda1 39062016 -> multiply by two for sector count add 63 for typical partition offset -->  78124095 
hda2