Messages in this thread | | | From | "Misha Alex" <> | Subject | Harddisk CHS to byte | Date | Fri, 16 Aug 2002 08:46:36 +0000 |
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>>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 >
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