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bug#33389: parted not recognizing partitions in "non-standard" MBRs with

From: Marc Stenson
Subject: bug#33389: parted not recognizing partitions in "non-standard" MBRs with valid partition tables
Date: Thu, 15 Nov 2018 00:27:02 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Thunderbird/52.6.0


While parted 2.3 had no issues with whatever was in the first 446 bytes of the MBR and only looked at the partition table, newer versions such as 3.2 seem to be thrown by unusual boot code (e.g. Grub4DOS) and either show the entire disk as unallocated space or as one big volume/partition with the file system of the first volume. This is despite the partition table being fully compliant and happily read by fdisk and sfdisk.

This may be a "feature" rather than a bug.   Please pardon my ignorance, perhaps newer partition table schemes require the first 446 bits to be parsed.  However it could save someone many hours of frustration if this was noted prominently in the documentation.

In my case It was fixed with a simple:
  dd if=/usr/lib/syslinux/mbr/mbr.bin of=/dev/sdb bs=446 count=1
after taking the requisite backups and a deep breath.

Thanks and regards,

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