> Setting this entry to '1' will put the kernel's dirty data writeout
> algorithms into a mode which is better suited to laptop/notebook
> computers. This mode is specifically designed to minimise the
> frequency of disk spinups. Laptop mode works as follows:
> - Dirty data remains in memory for longer periods of time (controlled
> by laptop_writeback_centisecs).
> - If there is pending dirty data and the disk is spun up for any
> reason (even for a read) then all dirty data will be written back
> shortly afterwards. ie: when the disk is spun up, make good use of
> - When the decision is made to write back some dirty data, the kernel
> will write back all dirty data.
Also write out everything just before stopping the disk.
Don't let the disk stop if there is any dirty data.
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