Messages in this thread |  | | From | "Misha Alex" <> | Date | Fri, 16 Aug 2002 07:51:37 +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
_________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com
- 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/
|  |