lkml.org 
[lkml]   [2002]   [Aug]   [16]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
From"Misha Alex" <>
SubjectHarddisk CHS to byte
DateFri, 16 Aug 2002 08:46:36 +0000


>>Hi,
>   1)How do convert C,H,S into bytes.
>     How can one read in linux if we know the C,H,S.
>
>      Also i tried the linear addressing linear = c*H*S + h*S +s -1 .But 
>linear or linear*512 never gave me the exact byte offset to seek.
>
>I am working in linux and using a hexeditor to seek .How many exact bytes 
>should i seek to find out the extended partition.I read the MBR and found 
>the exteneded partiton.
>00 01 01 00 02 fe 3f 01 3f 00 00 00 43 7d 00 00
>80 00 01 02 0b fe bf 7e 82 7d 00 00 3d 26 9c 00
>00 00 81 7f 0f fe ff ff bf a3 9c 00 f1 49 c3 01
>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
>
>See the third column it is 0f(extended windows).The cylinder is 639(7f81 h)
>and sector is 1 .I don't know where to exactly read for the next partiton.
>The byte offset for finding out the next partitions.
>
>If i open hda3(Mind you hda3 is an extended partition on hda) with a
>hexeditor i get
>
>00 01 81 7f 83 fe ff 7d 3f 00 00 00 00 82 3e 00
>00 00 c1 7e 05 fe ff ff 3f 82 3e 00 7e 04 7d 00
>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
>.Now the first partition is of type 83 which is linux and the next
>extended partition is of type 05(extended) and cylinder894 and sec1.
>
>
>
>*************************************
>How do i find the next chain of extended partitions.I mean how do i convert 
>cylinder 894 ,sec1 and head 0 into absolute bytes so that i can hexdump the 
>next partition table for finding out ?
>************************************
>
>Thank you,
>Misha
>




_________________________________________________________________
MSN Photos is the easiest way to share and print your photos: 
http://photos.msn.com/support/worldwide.aspx
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:28    [W:0.134 / U:0.450 seconds]
©2003-2008 Jasper Spaans