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my laptop's internal harddrive is a bit slow. I looked at the drive properties and there are two options:

[X] Enable write caching on the device
[ ] Turn off windows write-cache buffer flushing on the device

As you can see, the first option is checked already, but the second option isn't. I've heard the second option can really speed things up, but it also sounds very risky. Is it safe to do on a laptop that rarely is off of AC power? (but still has battery as well)

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Bad idea, potential data loss if the laptop does a spontaneous restart or crash. –  Moab Aug 28 '12 at 15:51
    
> Bad idea, potential data loss if the laptop does a spontaneous restart or crash. @Moab, that could be said of desktops as well, yet internal drives are usually set to be as fast as possible. The question isn’t about data loss due to crashes, but power-loss (which technically, a laptop is better off than a desktop because its battery is like a built-in UPS). –  Synetech Aug 28 '12 at 19:27
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Yes it is safe. Windows never uses up all of the battery power. When the battery level reaches a certain minimum (~6-7%), it automatically flushes drive caches and hibernates. It does this before the battery level is too low to hibernate which requires a certain amount of “juice” to spin the hard-drive long enough to copy the RAM to disk.

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