[Bug 945433] Re: Incorrect GPT length should be handled better

[Ahmad Moawya]

Here's fdisk output under OS X:

Disk: /dev/rdisk0	geometry: 19457/255/63 [312579695 sectors]
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
 1: EE    0   0   2 - 1023 255  63 [         1 -  312579694] <Unknown ID>
 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused  


Disk utility in MacOS reports this:

Total Size:               160.0 GB (160040803840 Bytes) (exactly
312579695 512-Byte-Blocks)

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https://bugs.launchpad.net/bugs/945433

Title:
  Incorrect GPT length should be handled better

Status in “gdisk” package in Ubuntu:
  New
Status in “parted” package in Ubuntu:
  Triaged

Bug description:
  The GPT LastUsableLba claims the disk is longer than it actually is.
  Parted should handle this error more gracefully and allow for
  repairing it.  gdisk seems to let the error go undetected, possibly
  because it is using the size in the protective MBR rather than
  LastUsableLba.

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