Re: Do we need to implement sr START/STOP management

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On 11/01/2011 12:35 AM, JiSheng Zhang wrote:
Hi James,

2011/11/1 James Bottomley<James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>:
On Tue, 2011-11-01 at 13:31 +0800, JiSheng Zhang wrote:
Currently, there's no start/stop management in scsi cdrom driver to
spin up/down the motor do we need to implement it?

Say more ... like what you think it buys.  The auto spin down of a CD
tends to be the best power control we have and it's not even clear that
manufacturers have implemented any other useful power states.

Does it mean the behavior depends on manufacturers? Some cd will spin
down automatically? Even so, how about during shutdown just after reading
something from cdrom?


I believe the main reason disks are stopped during shutdown is that for many hard drives that use head unloading, it's much better for the lifespan of the drive to do a powered head unload on software command before powering off than an emergency unload caused by a loss of power. I don't believe that optical drives have such an issue.
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