after installing ubuntu-server, HDD's are not detected in AHCI mode

Clint Byrum clint at
Mon Jun 14 15:31:19 UTC 2010

On Jun 13, 2010, at 8:28 PM, scar wrote:

> Hash: SHA256
> scar @ 06/13/2010 05:21 PM:
>> wonder if it's related to bug #551965?
> ah, success!  adding the 'partman/alignment=cylinder' boot parameter worked!
> although, i am still puzzled why this parameter was not needed in order
> for server #1 to work properly...

If the drives are not the exact same geometry, that might be the cause for the difference.

Its even occurred in the past where drives of the exact same "model number" were different revs, and had slightly different geometries.

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