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fdisk expert print lists wrong start sector for logical partitions

DISCUSSION Phillip Susi 2 participants 4 messages Nov 13, 2013 – Nov 14, 2013 Util-Linux package

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Phillip Susi

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The expert print function shows all logical partitions as having the same start sector as the extended partition that contains them.

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#1 lore raw
Quoted 2 lines · Phillip Susi

The expert print function shows all logical partitions as having the same start sector as the extended partition that contains them.

Normal mode:

Device Boot Start End Blocks Id System
/dev/sdb1 2048 22527 10240 83 Linux
/dev/sdb2 22528 1228799 603136 5 Extended
/dev/sdb5 24576 229375 102400 83 Linux
/dev/sdb6 231424 1228799 498688 83 Linux

Expert mode:

Nr AF Hd Sec Cyl Hd Sec Cyl Start Size Id

  1 00   32  33   0  102  37   1      2048     20480 83
  2 00  102  38   1  124  48  76     22528   1206272 05
  3 00    0   0   0    0   0   0         0         0 00
  4 00    0   0   0    0   0   0         0         0 00
  5 00  135   7   1   70  56  14      2048    204800 83

6 00 103 26 14 124 48 76 2048 997376 83

It's correct, although probably it seems strange at a first glance.

It dumps MBR and EBR tables, nothing else. It means that you can see all the values as stored on the device without any calculation.

I agree that this info is not too useful. Maybe we can change this old thing and describe the whole chain of the MBR->EBR->EBR... in more readable and more precise way. Not sure, but I guess nobody cares about this output backward compatibility.

Karel

Signature · 2 lines
 Karel Zak  <[email protected]>
 http://karelzak.blogspot.com
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#2 lore raw

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Quoted 6 lines · Karel Zak

It's correct, although probably it seems strange at a first glance.

It dumps MBR and EBR tables, nothing else. It means that you can see all the values as stored on the device without any calculation.

So it isn't saying the partition starts at sector 2048, but rather it is 2048 sectors from the EBR?

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maintainer
#3 lore raw
Quoted 7 lines · Phillip Susi

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Quoted 3 lines · Karel Zak

It's correct, although probably it seems strange at a first glance.

Quoted 6 lines
Quoted 3 lines

It dumps MBR and EBR tables, nothing else. It means that you can see all the values as stored on the device without any calculation.

So it isn't saying the partition starts at sector 2048, but rather it is 2048 sectors from the EBR?

Yep.
Karel

Quoted 19 lines

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Signature · 2 lines
 Karel Zak  <[email protected]>
 http://karelzak.blogspot.com