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Re: [Bug-xorriso] Test Proposal for [bug #46716] Protective MBR partitio

From: Alexander E. Patrakov
Subject: Re: [Bug-xorriso] Test Proposal for [bug #46716] Protective MBR partition is not marked as bootable
Date: Tue, 22 Dec 2015 20:13:08 +0500
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22.12.2015 20:05, Thomas Schmitt пишет:

Alexander E. Patrakov wrote:
The following variants, obtained by changing only the MBR, also work:
1. Type-0 one-sector bootable partition at the very first sector:
000001d0: 0100 0000 0200 0000 0000 0100 0000 0000  ................

Did you create this by partition editor or by dd ?

By xxd, vim and dd.

While trying to mimick it, i wonder whether the "0200" should
not be "0100". I understand that the value "02" is in byte 468 = 0x1d4:
Sector part of C/H/S address of last absolute sector in partition 2.
(Plus 2 bits from cylinder part which are 0.)

The CHS information is indeed bogus in my test MBRs.

A partition from LBA 0 with 1 blocks should have C/H/S range
0/0/1 to 0/0/1, not 0/0/1 to 0/0/2.

(I am not sure how to express the end C/H/S of an empty partition
  at LBA 0. 0/0/0 is not really a valid C/H/S.)

I have not tested empty partitions, only partitions with size of 1 sector or more.


There is a new GNU xorriso development snapshot uploaded


   MD5 5163f97f5ce9a7707ac7de6777b46283

I will look into it tomorrow.

Alexander E. Patrakov

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