That is really strange.  I did not think Windows could handle non 512
byte sector devices.  There does not appear to be any known field in the
pdc header that specifies the sector size.  It could be that it just
uses 2k for anything over 2TB.  Actually, I wonder if it uses whatever
sector size would be required for MBR to address the whole thing?  So
maybe it goes to 1k for 2-4 TB, then 2k for 4-8 TB?

Henry, can you dump the first few sectors of the individual disks?

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https://bugs.launchpad.net/bugs/599255

Title:
  dmraid fails to read promise RAID sector count larger than 32-bits

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