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Apple Computing Products:
macOS - Notebook Hardware
crashed and won't restart
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<blockquote data-quote="Geeky1" data-source="post: 524225" data-attributes="member: 34442"><p>That would be a logical conclusion, MHC, yes, but the reality is that it doesn't. I go into detail about it here:</p><p><a href="http://www.mac-forums.com/forums/showthread.php?p=492979#post492979" target="_blank">http://www.mac-forums.com/forums/showthread.php?p=492979#post492979</a></p><p></p><p>What it comes down to is that the motor that spins up these drives is so small that the 5400rpm and the 7200rpm drives have near-as-makes-no-difference identical power consumption. If you were writing data constantly to the drive, you might take literally a couple minutes at most off the system's battery life with a 7200rpm drive. But the thing is, if you're running the drive constantly you're virtually guaranteed to be working the CPU at least and possibly the RAM as well, which is going to have a much larger impact on battery life than the drive itself will. And since the drives consume the same amount of power at idle, and idle is the state they spend most of their time in, the 7.2k drive has, for all intents and purposes, no measurable impact on battery life.</p></blockquote><p></p>
[QUOTE="Geeky1, post: 524225, member: 34442"] That would be a logical conclusion, MHC, yes, but the reality is that it doesn't. I go into detail about it here: [url]http://www.mac-forums.com/forums/showthread.php?p=492979#post492979[/url] What it comes down to is that the motor that spins up these drives is so small that the 5400rpm and the 7200rpm drives have near-as-makes-no-difference identical power consumption. If you were writing data constantly to the drive, you might take literally a couple minutes at most off the system's battery life with a 7200rpm drive. But the thing is, if you're running the drive constantly you're virtually guaranteed to be working the CPU at least and possibly the RAM as well, which is going to have a much larger impact on battery life than the drive itself will. And since the drives consume the same amount of power at idle, and idle is the state they spend most of their time in, the 7.2k drive has, for all intents and purposes, no measurable impact on battery life. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
crashed and won't restart
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